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1.
J Proteome Res ; 21(7): 1686-1693, 2022 07 01.
Artículo en Inglés | MEDLINE | ID: mdl-35653712

RESUMEN

Scanning SWATH coupled with normal-flow LC has been recently introduced for high-content, high-throughput proteomics analysis, which requires a relatively large amount of sample injection. Here we established the microflow LC coupled with Scanning SWATH for samples with relatively small quantities. First, we optimized several key parameters of the LC and MS settings, including C18 particle size for the analytical column, LC gradient and flow rate, as well as effective ion accumulation time and isolation window width for MS acquisition. We then compared the optimized Scanning SWATH method with the conventional variable window SWATH (referred to as SWATH) method. Results showed that the total ion chromatogram signals in Scanning SWATH were 10 times higher than that of SWATH, and Scanning SWATH identified 12.2-22.2% more peptides than SWATH. Finally, we employed 120 min Scanning SWATH to acquire the proteomes of 62 formalin-fixed, paraffin-embedded (FFPE) tissue samples from 31 patients with hepatocellular carcinoma (HCC). Altogether, 92 334 peptides and 8516 proteins were quantified. Besides the reported biomarkers, including ANXA2, MCM7, SUOX, and AKR1B10, we identified new potential HCC biomarkers such as CST5, TP53, CEBPB, and E2F4. Taken together, we present an optimal workflow integrating microflow LC and Scanning SWATH that effectively improves the protein identification and quantitation.


Asunto(s)
Carcinoma Hepatocelular , Neoplasias Hepáticas , Biomarcadores , Humanos , Neoplasias Hepáticas/diagnóstico por imagen , Péptidos , Proteómica/métodos
2.
Nat Methods ; 14(9): 921-927, 2017 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-28825704

RESUMEN

Liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) is the main method for high-throughput identification and quantification of peptides and inferred proteins. Within this field, data-independent acquisition (DIA) combined with peptide-centric scoring, as exemplified by the technique SWATH-MS, has emerged as a scalable method to achieve deep and consistent proteome coverage across large-scale data sets. We demonstrate that statistical concepts developed for discovery proteomics based on spectrum-centric scoring can be adapted to large-scale DIA experiments that have been analyzed with peptide-centric scoring strategies, and we provide guidance on their application. We show that optimal tradeoffs between sensitivity and specificity require careful considerations of the relationship between proteins in the samples and proteins represented in the spectral library. We propose the application of a global analyte constraint to prevent the accumulation of false positives across large-scale data sets. Furthermore, to increase the quality and reproducibility of published proteomic results, well-established confidence criteria should be reported for the detected peptide queries, peptides and inferred proteins.


Asunto(s)
Interpretación Estadística de Datos , Ensayos Analíticos de Alto Rendimiento/métodos , Espectrometría de Masas/métodos , Mapeo Peptídico/métodos , Proteínas/química , Análisis de Secuencia de Proteína/métodos , Simulación por Computador , Modelos Estadísticos , Proteínas/análisis , Reproducibilidad de los Resultados , Sensibilidad y Especificidad
3.
Nature ; 499(7457): 166-71, 2013 Jul 11.
Artículo en Inglés | MEDLINE | ID: mdl-23846654

RESUMEN

Cell-surface receptors frequently use scaffold proteins to recruit cytoplasmic targets, but the rationale for this is uncertain. Activated receptor tyrosine kinases, for example, engage scaffolds such as Shc1 that contain phosphotyrosine (pTyr)-binding (PTB) domains. Using quantitative mass spectrometry, here we show that mammalian Shc1 responds to epidermal growth factor (EGF) stimulation through multiple waves of distinct phosphorylation events and protein interactions. After stimulation, Shc1 rapidly binds a group of proteins that activate pro-mitogenic or survival pathways dependent on recruitment of the Grb2 adaptor to Shc1 pTyr sites. Akt-mediated feedback phosphorylation of Shc1 Ser 29 then recruits the Ptpn12 tyrosine phosphatase. This is followed by a sub-network of proteins involved in cytoskeletal reorganization, trafficking and signal termination that binds Shc1 with delayed kinetics, largely through the SgK269 pseudokinase/adaptor protein. Ptpn12 acts as a switch to convert Shc1 from pTyr/Grb2-based signalling to SgK269-mediated pathways that regulate cell invasion and morphogenesis. The Shc1 scaffold therefore directs the temporal flow of signalling information after EGF stimulation.


Asunto(s)
Factor de Crecimiento Epidérmico/metabolismo , Proteínas Adaptadoras de la Señalización Shc/metabolismo , Transducción de Señal , Animales , Mama/citología , Línea Celular , Células Epiteliales/citología , Receptores ErbB/agonistas , Receptores ErbB/metabolismo , Quinasas MAP Reguladas por Señal Extracelular/metabolismo , Retroalimentación Fisiológica , Proteína Adaptadora GRB2/deficiencia , Proteína Adaptadora GRB2/genética , Proteína Adaptadora GRB2/metabolismo , Humanos , Ratones , Complejos Multiproteicos/química , Complejos Multiproteicos/metabolismo , Fosforilación , Unión Proteica , Proteínas Tirosina Quinasas , Proteínas Proto-Oncogénicas c-akt/metabolismo , Ratas , Proteínas Adaptadoras de la Señalización Shc/deficiencia , Proteínas Adaptadoras de la Señalización Shc/genética , Proteína Transformadora 1 que Contiene Dominios de Homología 2 de Src , Factores de Tiempo
4.
J Proteome Res ; 17(12): 4051-4060, 2018 12 07.
Artículo en Inglés | MEDLINE | ID: mdl-30270626

RESUMEN

The 2017 Dagstuhl Seminar on Computational Proteomics provided an opportunity for a broad discussion on the current state and future directions of the generation and use of peptide tandem mass spectrometry spectral libraries. Their use in proteomics is growing slowly, but there are multiple challenges in the field that must be addressed to further increase the adoption of spectral libraries and related techniques. The primary bottlenecks are the paucity of high quality and comprehensive libraries and the general difficulty of adopting spectral library searching into existing workflows. There are several existing spectral library formats, but none captures a satisfactory level of metadata; therefore, a logical next improvement is to design a more advanced, Proteomics Standards Initiative-approved spectral library format that can encode all of the desired metadata. The group discussed a series of metadata requirements organized into three designations of completeness or quality, tentatively dubbed bronze, silver, and gold. The metadata can be organized at four different levels of granularity: at the collection (library) level, at the individual entry (peptide ion) level, at the peak (fragment ion) level, and at the peak annotation level. Strategies for encoding mass modifications in a consistent manner and the requirement for encoding high-quality and commonly seen but as-yet-unidentified spectra were discussed. The group also discussed related topics, including strategies for comparing two spectra, techniques for generating representative spectra for a library, approaches for selection of optimal signature ions for targeted workflows, and issues surrounding the merging of two or more libraries into one. We present here a review of this field and the challenges that the community must address in order to accelerate the adoption of spectral libraries in routine analysis of proteomics datasets.


Asunto(s)
Bases de Datos de Proteínas/normas , Biblioteca de Péptidos , Proteómica/métodos , Animales , Humanos , Espectrometría de Masas en Tándem/métodos , Flujo de Trabajo
5.
Proteomics ; 17(10): e1500522, 2017 May.
Artículo en Inglés | MEDLINE | ID: mdl-28387034

RESUMEN

Data-independent acquisition (DIA) approaches, such as SWATH® -MS, are showing great potential to reliably quantify significant numbers of peptides and proteins in an unbiased manner. These developments have enhanced interest in developing a single DIA method that integrates qualitative and quantitative analysis, eliminating the need of a prebuilt library of peptide spectra, which are created through data-dependent acquisition methods or from public repositories. Here, we introduce a new DIA approach, referred to as "SWATH-ID," which was developed to allow peptide identification as well as quantitation. The SWATH-ID method is composed of small Q1 windows, achieving better selectivity and thus significantly improving high-confidence peptide extractions from data files. Furthermore, the SWATH-ID approach transmits precursor ions without fragmentation as well as their fragments within the same SWATH acquisition period. This provides a single scan that includes all precursor ions within the isolation window as well as a record of all of their fragment ions, substantially negating the need for a survey scan. In this way all precursors present in a small Q1 window are associated with their fragment ions, improving the identification specificity and providing a more comprehensive and in-depth view of protein and peptide species in complex samples.

6.
Nat Methods ; 10(12): 1239-45, 2013 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-24162924

RESUMEN

Characterizing changes in protein-protein interactions associated with sequence variants (e.g., disease-associated mutations or splice forms) or following exposure to drugs, growth factors or hormones is critical to understanding how protein complexes are built, localized and regulated. Affinity purification (AP) coupled with mass spectrometry permits the analysis of protein interactions under near-physiological conditions, yet monitoring interaction changes requires the development of a robust and sensitive quantitative approach, especially for large-scale studies in which cost and time are major considerations. We have coupled AP to data-independent mass spectrometric acquisition (sequential window acquisition of all theoretical spectra, SWATH) and implemented an automated data extraction and statistical analysis pipeline to score modulated interactions. We used AP-SWATH to characterize changes in protein-protein interactions imparted by the HSP90 inhibitor NVP-AUY922 or melanoma-associated mutations in the human kinase CDK4. We show that AP-SWATH is a robust label-free approach to characterize such changes and propose a scalable pipeline for systems biology studies.


Asunto(s)
Cromatografía de Afinidad/métodos , Espectrometría de Masas/métodos , Mapeo de Interacción de Proteínas/métodos , Automatización , Cromatografía Liquida/métodos , Quinasa 4 Dependiente de la Ciclina/química , Quinasa 4 Dependiente de la Ciclina/genética , Biblioteca de Genes , Humanos , Isoxazoles/química , Mutación , Análisis de Componente Principal , Proteínas/química , Resorcinoles/química , Biología de Sistemas
7.
Proteomics ; 15(7): 1202-14, 2015 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-25476245

RESUMEN

We present a comprehensive workflow for large scale (>1000 transitions/run) label-free LC-MRM proteome assays. Innovations include automated MRM transition selection, intelligent retention time scheduling that improves S/N by twofold, and automatic peak modeling. Improvements to data analysis include a novel Q/C metric, normalized group area ratio, MLR normalization, weighted regression analysis, and data dissemination through the Yale protein expression database. As a proof of principle we developed a robust 90 min LC-MRM assay for mouse/rat postsynaptic density fractions which resulted in the routine quantification of 337 peptides from 112 proteins based on 15 observations per protein. Parallel analyses with stable isotope dilution peptide standards (SIS), demonstrate very high correlation in retention time (1.0) and protein fold change (0.94) between the label-free and SIS analyses. Overall, our method achieved a technical CV of 11.4% with >97.5% of the 1697 transitions being quantified without user intervention, resulting in a highly efficient, robust, and single injection LC-MRM assay.


Asunto(s)
Proteínas del Tejido Nervioso/química , Proteoma/química , Sinapsis/química , Animales , Química Encefálica , Cromatografía Líquida de Alta Presión , Proteínas del Tejido Nervioso/aislamiento & purificación , Densidad Postsináptica/química , Proteoma/aislamiento & purificación , Proteómica , Ratas , Espectrometría de Masas en Tándem
8.
J Proteome Res ; 14(1): 457-66, 2015 Jan 02.
Artículo en Inglés | MEDLINE | ID: mdl-25299736

RESUMEN

Threatened preterm labor (TPTL) accounts for ∼30% of pregnancy-related hospital admissions. Maternal peripheral leukocytes can be used to monitor a variety of physiological processes occurring in the body. Two high-throughput mass spectrometry methodologies, SWATH and iTRAQ, were used to study differentially expressed peripheral blood leukocyte lysate proteins in symptomatic women admitted for TPTL who had a preterm birth within 48 h (n = 16) and those who did not (n = 24). The SWATH spectral library consisted of 783 proteins. SWATH methodology quantified 258 proteins (using ≥2 peptides) and 5 proteins (ALBU, ANXA6, HNRPK, HSP90A, and PDIA1) were differentially expressed (p < 0.05, Mann-Whitney U). iTRAQ workflow identified 765 proteins; 354 proteins were quantified and 14 proteins (MIF, UBIQ, HXK3, ALBU, HNRPD, ST1A2, RS15A, RAP1B, CAN1, IQGA2, ST1A1, COX5A, ADDA, and UBQL1) were significantly different between the two groups of women (p < 0.05, Mann-Whitney U). Albumin was the only common differentially expressed protein in both SWATH (28% decrease) and iTRAQ studies (45% decrease). This decrease in albumin was validated using ELISA (11% decrease, p < 0.05, Mann-Whitney U) in another 23 TPTL women. This work suggests that albumin is a broad indicator of leukocyte activation with impending preterm birth and provides new future work directions to understand the pathophysiology of TPTL.


Asunto(s)
Regulación de la Expresión Génica/fisiología , Trabajo de Parto Prematuro/sangre , Trabajo de Parto Prematuro/fisiopatología , Nacimiento Prematuro/fisiopatología , Albúmina Sérica/metabolismo , Ensayo de Inmunoadsorción Enzimática , Femenino , Ensayos Analíticos de Alto Rendimiento/métodos , Humanos , Espectrometría de Masas/métodos , Embarazo , Nacimiento Prematuro/sangre , Estadísticas no Paramétricas , Factores de Tiempo , Australia Occidental
9.
Mol Cell Proteomics ; 11(6): O111.016717, 2012 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-22261725

RESUMEN

Most proteomic studies use liquid chromatography coupled to tandem mass spectrometry to identify and quantify the peptides generated by the proteolysis of a biological sample. However, with the current methods it remains challenging to rapidly, consistently, reproducibly, accurately, and sensitively detect and quantify large fractions of proteomes across multiple samples. Here we present a new strategy that systematically queries sample sets for the presence and quantity of essentially any protein of interest. It consists of using the information available in fragment ion spectral libraries to mine the complete fragment ion maps generated using a data-independent acquisition method. For this study, the data were acquired on a fast, high resolution quadrupole-quadrupole time-of-flight (TOF) instrument by repeatedly cycling through 32 consecutive 25-Da precursor isolation windows (swaths). This SWATH MS acquisition setup generates, in a single sample injection, time-resolved fragment ion spectra for all the analytes detectable within the 400-1200 m/z precursor range and the user-defined retention time window. We show that suitable combinations of fragment ions extracted from these data sets are sufficiently specific to confidently identify query peptides over a dynamic range of 4 orders of magnitude, even if the precursors of the queried peptides are not detectable in the survey scans. We also show that queried peptides are quantified with a consistency and accuracy comparable with that of selected reaction monitoring, the gold standard proteomic quantification method. Moreover, targeted data extraction enables ad libitum quantification refinement and dynamic extension of protein probing by iterative re-mining of the once-and-forever acquired data sets. This combination of unbiased, broad range precursor ion fragmentation and targeted data extraction alleviates most constraints of present proteomic methods and should be equally applicable to the comprehensive analysis of other classes of analytes, beyond proteomics.


Asunto(s)
Minería de Datos , Mapeo Peptídico , Proteoma/química , Espectrometría de Masas en Tándem , Secuencia de Aminoácidos , Cromatografía Liquida , Simulación por Computador , Interpretación Estadística de Datos , Límite de Detección , Mitocondrias/enzimología , Datos de Secuencia Molecular , Fragmentos de Péptidos/química , Mapeo Peptídico/normas , Procesamiento Proteico-Postraduccional , Proteoma/metabolismo , Estándares de Referencia , Saccharomyces cerevisiae/enzimología , Saccharomyces cerevisiae/metabolismo , Proteínas de Saccharomyces cerevisiae/química , Proteínas de Saccharomyces cerevisiae/metabolismo , Espectrometría de Masas en Tándem/normas
10.
Anal Chim Acta ; 1325: 343135, 2024 Oct 09.
Artículo en Inglés | MEDLINE | ID: mdl-39244297

RESUMEN

BACKGROUND: Mass spectrometry (MS)-based proteomics is a powerful tool for identifying and quantifying proteins. However, chimeric spectra caused by the fragmentation of multiple precursors within the same isolation window impair the accuracy of peptide identification and isobaric mass tag-based quantification. While there have been advances in computational deconvolution of chimeric spectra and methods to further separate the peptides by ion mobility or through MSn, the use of narrower isolation windows to decrease the fraction of chimeric species remains to be fully explored. RESULTS: We present results obtained on a SCIEX TripleTOF instrument where the quadrupole was optimized and tuned for precursor isolation at 0.1 Da (FWHH). Using a three-proteome model (trypsin digest of protein lysates from yeast, human and E. coli) and 8-plex iTRAQ labeling to document the interference effect, we investigated the impact of co-fragmentation on spectral purity, identification accuracy and quantification accuracy. The narrow quadrupole isolation window significantly improved the spectral purity and reduced the interference of non-target precursors on quantification accuracy. The high-resolution isolation strategy also reduced the number of false identifications caused by chimeric spectra. While these improvements came at the cost of sensitivity loss, combining high-resolution isolation with other advanced techniques, including ion mobility, may result in improved accuracy in identification and quantification. SIGNIFICANCE: Compared to standard-resolution quadrupole isolation (0.7 Da), high-resolution quadrupole isolation (0.1 Da) significantly improved the spectral purity and quantification accuracy while reducing the number of potential false identifications caused by chimeric spectra, thus showing excellent potential for further development to analyze clinical proteomics samples, for which high accuracy is essential.


Asunto(s)
Proteómica , Proteómica/métodos , Humanos , Iones/química , Escherichia coli/química , Saccharomyces cerevisiae/química , Péptidos/química , Péptidos/análisis , Espectrometría de Masas/métodos
12.
J Biol Chem ; 286(28): 25065-75, 2011 Jul 15.
Artículo en Inglés | MEDLINE | ID: mdl-21561862

RESUMEN

Cerebral cavernous malformations (CCMs) are alterations in brain capillary architecture that can result in neurological deficits, seizures, or stroke. We recently demonstrated that CCM3, a protein mutated in familial CCMs, resides predominantly within the STRIPAK complex (striatin interacting phosphatase and kinase). Along with CCM3, STRIPAK contains the Ser/Thr phosphatase PP2A. The PP2A holoenzyme consists of a core catalytic subunit along with variable scaffolding and regulatory subunits. Within STRIPAK, striatin family members act as PP2A regulatory subunits. STRIPAK also contains all three members of a subfamily of Sterile 20 kinases called the GCKIII proteins (MST4, STK24, and STK25). Here, we report that striatins and CCM3 bridge the phosphatase and kinase components of STRIPAK and map the interacting regions on each protein. We show that striatins and CCM3 regulate the Golgi localization of MST4 in an opposite manner. Consistent with a previously described function for MST4 and CCM3 in Golgi positioning, depletion of CCM3 or striatins affects Golgi polarization, also in an opposite manner. We propose that STRIPAK regulates the balance between MST4 localization at the Golgi and in the cytosol to control Golgi positioning.


Asunto(s)
Proteínas Reguladoras de la Apoptosis/metabolismo , Aparato de Golgi/metabolismo , Proteínas de la Membrana/metabolismo , Complejos Multiproteicos/metabolismo , Proteína Fosfatasa 2/metabolismo , Proteínas Serina-Treonina Quinasas/metabolismo , Proteínas Proto-Oncogénicas/metabolismo , Animales , Proteínas Reguladoras de la Apoptosis/química , Proteínas Reguladoras de la Apoptosis/genética , Proteínas de Unión a Calmodulina/química , Proteínas de Unión a Calmodulina/genética , Proteínas de Unión a Calmodulina/metabolismo , Quinasas del Centro Germinal , Aparato de Golgi/química , Aparato de Golgi/genética , Células HEK293 , Células HeLa , Humanos , Proteínas de la Membrana/química , Proteínas de la Membrana/genética , Ratones , Complejos Multiproteicos/química , Complejos Multiproteicos/genética , Proteínas del Tejido Nervioso/química , Proteínas del Tejido Nervioso/genética , Proteínas del Tejido Nervioso/metabolismo , Proteína Fosfatasa 2/química , Proteína Fosfatasa 2/genética , Proteínas Serina-Treonina Quinasas/química , Proteínas Serina-Treonina Quinasas/genética , Proteínas Proto-Oncogénicas/química , Proteínas Proto-Oncogénicas/genética , Relación Estructura-Actividad
13.
Elife ; 112022 11 30.
Artículo en Inglés | MEDLINE | ID: mdl-36449390

RESUMEN

The possibility to record proteomes in high throughput and at high quality has opened new avenues for biomedical research, drug discovery, systems biology, and clinical translation. However, high-throughput proteomic experiments often require high sample amounts and can be less sensitive compared to conventional proteomic experiments. Here, we introduce and benchmark Zeno SWATH MS, a data-independent acquisition technique that employs a linear ion trap pulsing (Zeno trap pulsing) to increase the sensitivity in high-throughput proteomic experiments. We demonstrate that when combined with fast micro- or analytical flow-rate chromatography, Zeno SWATH MS increases protein identification with low sample amounts. For instance, using 20 min micro-flow-rate chromatography, Zeno SWATH MS identified more than 5000 proteins consistently, and with a coefficient of variation of 6%, from a 62.5 ng load of human cell line tryptic digest. Using 5 min analytical flow-rate chromatography (800 µl/min), Zeno SWATH MS identified 4907 proteins from a triplicate injection of 2 µg of a human cell lysate, or more than 3000 proteins from a 250 ng tryptic digest. Zeno SWATH MS hence facilitates sensitive high-throughput proteomic experiments with low sample amounts, mitigating the current bottlenecks of high-throughput proteomics.


Asunto(s)
Investigación Biomédica , Proteómica , Humanos , Proteoma , Biología de Sistemas , Descubrimiento de Drogas
14.
Sci Data ; 9(1): 126, 2022 03 30.
Artículo en Inglés | MEDLINE | ID: mdl-35354825

RESUMEN

In the last decade, a revolution in liquid chromatography-mass spectrometry (LC-MS) based proteomics was unfolded with the introduction of dozens of novel instruments that incorporate additional data dimensions through innovative acquisition methodologies, in turn inspiring specialized data analysis pipelines. Simultaneously, a growing number of proteomics datasets have been made publicly available through data repositories such as ProteomeXchange, Zenodo and Skyline Panorama. However, developing algorithms to mine this data and assessing the performance on different platforms is currently hampered by the lack of a single benchmark experimental design. Therefore, we acquired a hybrid proteome mixture on different instrument platforms and in all currently available families of data acquisition. Here, we present a comprehensive Data-Dependent and Data-Independent Acquisition (DDA/DIA) dataset acquired using several of the most commonly used current day instrumental platforms. The dataset consists of over 700 LC-MS runs, including adequate replicates allowing robust statistics and covering over nearly 10 different data formats, including scanning quadrupole and ion mobility enabled acquisitions. Datasets are available via ProteomeXchange (PXD028735).


Asunto(s)
Benchmarking , Proteómica , Animales , Cromatografía Liquida/métodos , Humanos , Espectrometría de Masas/métodos , Proteoma
15.
Proteomics ; 11(13): 2603-12, 2011 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-21630450

RESUMEN

Affinity purification coupled to mass spectrometry (AP-MS) is gaining widespread use for the identification of protein-protein interactions. It is unclear, however, whether typical AP sample complexity is limiting for the identification of all protein components using standard one-dimensional LC-MS/MS. Multidimensional sample separation is useful for reducing sample complexity prior to MS analysis and increases peptide and protein coverage of complex samples. Here, we monitored the effects of upstream protein or peptide separation techniques on typical mammalian AP-MS samples, generated by FLAG affinity purification of four baits with different biological functions and/or subcellular distribution. As a first separation step, we employed SDS-PAGE, strong cation exchange LC, or reversed-phase LC at basic pH. We also analyzed the benefits of using an instrument with a faster scan rate, the new TripleTOF 5600 mass spectrometer. While all multidimensional approaches yielded a clear increase in spectral counts, the increase in unique peptides and additional protein identification was modest and came at the cost of increased instrument and handling time. The use of a high duty-cycle instrument achieved similar benefits without these drawbacks. An increase in spectral counts is beneficial when data analysis methods relying on spectral counts, including Significance Analysis of INTeractome (SAINT), are used.


Asunto(s)
Fraccionamiento Químico/métodos , Cromatografía de Afinidad , Análisis Costo-Beneficio , Espectrometría de Masas , Línea Celular , Cromatografía de Afinidad/economía , Cromatografía de Afinidad/métodos , Humanos , Espectrometría de Masas/economía , Espectrometría de Masas/métodos , Proteínas/análisis , Proteómica/economía , Proteómica/métodos
16.
Proc Natl Acad Sci U S A ; 105(30): 10402-7, 2008 Jul 29.
Artículo en Inglés | MEDLINE | ID: mdl-18641122

RESUMEN

Phosphorylation of the polarity protein Par-3 by the serine/threonine kinases aPKCzeta/iota and Par-1 (EMK1/MARK2) regulates various aspects of epithelial cell polarity, but little is known about the mechanisms by which these posttranslational modifications are reversed. We find that the serine/threonine protein phosphatase PP1 (predominantly the alpha isoform) binds Par-3, which localizes to tight junctions in MDCKII cells. PP1alpha can associate with multiple sites on Par-3 while retaining its phosphatase activity. By using a quantitative mass spectrometry-based technique, multiple reaction monitoring, we show that PP1alpha specifically dephosphorylates Ser-144 and Ser-824 of mouse Par-3, as well as a peptide encompassing Ser-885. Consistent with these observations, PP1alpha regulates the binding of 14-3-3 proteins and the atypical protein kinase C (aPKC) zeta to Par-3. Furthermore, the induced expression of a catalytically inactive mutant of PP1alpha severely delays the formation of functional tight junctions in MDCKII cells. Collectively, these results show that Par-3 functions as a scaffold, coordinating both serine/threonine kinases and the PP1alpha phosphatase, thereby providing dynamic control of the phosphorylation events that regulate the Par-3/aPKC complex.


Asunto(s)
Moléculas de Adhesión Celular/metabolismo , Proteína Fosfatasa 1/fisiología , Proteínas 14-3-3/metabolismo , Proteínas Adaptadoras Transductoras de Señales , Animales , Proteínas de Ciclo Celular , Línea Celular , Perros , Humanos , Ratones , Modelos Biológicos , Monoéster Fosfórico Hidrolasas/metabolismo , Fosforilación , Isoformas de Proteínas , Proteína Quinasa C-alfa/metabolismo , Serina/química , Uniones Estrechas/metabolismo
17.
Nat Biotechnol ; 39(7): 846-854, 2021 07.
Artículo en Inglés | MEDLINE | ID: mdl-33767396

RESUMEN

Accurate quantification of the proteome remains challenging for large sample series and longitudinal experiments. We report a data-independent acquisition method, Scanning SWATH, that accelerates mass spectrometric (MS) duty cycles, yielding quantitative proteomes in combination with short gradients and high-flow (800 µl min-1) chromatography. Exploiting a continuous movement of the precursor isolation window to assign precursor masses to tandem mass spectrometry (MS/MS) fragment traces, Scanning SWATH increases precursor identifications by ~70% compared to conventional data-independent acquisition (DIA) methods on 0.5-5-min chromatographic gradients. We demonstrate the application of ultra-fast proteomics in drug mode-of-action screening and plasma proteomics. Scanning SWATH proteomes capture the mode of action of fungistatic azoles and statins. Moreover, we confirm 43 and identify 11 new plasma proteome biomarkers of COVID-19 severity, advancing patient classification and biomarker discovery. Thus, our results demonstrate a substantial acceleration and increased depth in fast proteomic experiments that facilitate proteomic drug screens and clinical studies.


Asunto(s)
Proteómica/métodos , Espectrometría de Masas en Tándem , Arabidopsis/metabolismo , Biomarcadores/metabolismo , COVID-19/sangre , COVID-19/diagnóstico , Línea Celular , Humanos , Péptidos/análisis , Proteoma/análisis , Saccharomyces cerevisiae/metabolismo , Proteínas de Saccharomyces cerevisiae/metabolismo , Índice de Severidad de la Enfermedad
18.
Mol Omics ; 16(5): 436-447, 2020 10 12.
Artículo en Inglés | MEDLINE | ID: mdl-32519713

RESUMEN

We have developed MetaboKit, a comprehensive software package for compound identification and relative quantification in mass spectrometry-based untargeted metabolomics analysis. In data dependent acquisition (DDA) analysis, MetaboKit constructs a customized spectral library with compound identities from reference spectral libraries, adducts, dimers, in-source fragments (ISF), MS/MS fragmentation spectra, and more importantly the retention time information unique to the chromatography system used in the experiment. Using the customized library, the software performs targeted peak integration for precursor ions in DDA analysis and for precursor and product ions in data independent acquisition (DIA) analysis. With its stringent identification algorithm requiring matches by both MS and MS/MS data, MetaboKit provides identification results with significantly greater specificity than the competing software packages without loss in sensitivity. The proposed MS/MS-based screening of ISFs also reduces the chance of unverifiable identification of ISFs considerably. MetaboKit's quantification module produced peak area values highly correlated with known concentrations in a DIA analysis of the metabolite standards at both MS1 and MS2 levels. Moreover, the analysis of Cdk1Liv-/- mouse livers showed that MetaboKit can identify a wide range of lipid species and their ISFs, and quantitatively reconstitute the well-characterized fatty liver phenotype in these mice. In DIA data, the MS1-level and MS2-level peak area data produced similar fold change estimates in the differential abundance analysis, and the MS2-level peak area data allowed for quantitative comparisons in compounds whose precursor ion chromatogram was too noisy for peak integration.


Asunto(s)
Minería de Datos , Metabolómica , Programas Informáticos , Animales , Hígado/metabolismo , Ratones Noqueados , Estándares de Referencia , Espectrometría de Masas en Tándem
19.
Sci Data ; 7(1): 263, 2020 08 11.
Artículo en Inglés | MEDLINE | ID: mdl-32782267

RESUMEN

Sequential window acquisition of all theoretical fragment-ion spectra (SWATH) is a data-independent acquisition (DIA) strategy that requires a specific spectral library to generate unbiased and consistent quantitative data matrices of all peptides. SWATH-MS is a promising approach for in-depth proteomic profiling of Chinese hamster Ovary (CHO) cell lines, improving mechanistic understanding of process optimization, and real-time monitoring of process parameters in biologics R&D and manufacturing. However, no spectral library for CHO cells is publicly available. Here we present a comprehensive CHO global spectral library to measure the abundance of more than 10,000 proteins consisting of 199,102 identified peptides from a CHO-K1 cell proteome. The robustness, accuracy and consistency of the spectral library were validated for high confidence in protein identification and reproducible quantification in different CHO-derived cell lines, instrumental setups and downstream processing samples. The availability of a comprehensive SWATH CHO global spectral library will facilitate detailed characterization of upstream and downstream processes, as well as quality by design (QbD) in biomanufacturing. The data have been deposited to ProteomeXchange (PXD016047).


Asunto(s)
Proteoma/química , Animales , Células CHO , Cricetulus , Biblioteca de Genes , Proteómica
20.
Sci Rep ; 9(1): 15240, 2019 10 23.
Artículo en Inglés | MEDLINE | ID: mdl-31645615

RESUMEN

Advances in gene editing now allow reverse genetics to be applied to a broad range of biological systems. Ultimately, any modification to coding sequences requires confirmation at the protein level, although immunoblotting is often hampered by antibody quality or availability especially in non-model species. Sequential Window Acquisition of All Theoretical Spectra (SWATH), a mass spectrometry (MS) technology with exceptional quantitative reproducibility and accuracy, offers an ideal alternative for protein-based confirmation. Here, using genome edits in mouse, zebrafish and Bicyclus anynana butterflies produced using either homologous recombination or targeted nucleases, we demonstrate absence of the targeted proteins using SWATH, thus confirming successful editing. We show that SWATH is a robust antibody-independent alternative for monitoring gene editing at the protein level and broadly applicable across diverse organisms and targeted genome manipulation techniques. Moreover, SWATH concomitantly defines the global proteome response in the edited organism, which may provide pertinent biological insights.


Asunto(s)
Edición Génica , Espectrometría de Masas/métodos , Proteínas/genética , Secuencia de Aminoácidos , Animales , Mariposas Diurnas , Edición Génica/métodos , Recombinación Homóloga , Ratones , Proteínas/análisis , Proteoma/análisis , Proteoma/genética , Proteómica/métodos , Pez Cebra
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