Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 322
Filtrar
Mais filtros

Bases de dados
Tipo de documento
Intervalo de ano de publicação
1.
Proc Natl Acad Sci U S A ; 119(1)2022 01 04.
Artigo em Inglês | MEDLINE | ID: mdl-34983843

RESUMO

In Arabidopsis, vacuolar sorting receptor isoform 1 (VSR1) sorts 12S globulins to the protein storage vacuoles during seed development. Vacuolar sorting is mediated by specific protein-protein interactions between VSR1 and the vacuolar sorting determinant located at the C terminus (ctVSD) on the cargo proteins. Here, we determined the crystal structure of the protease-associated domain of VSR1 (VSR1-PA) in complex with the C-terminal pentapeptide (468RVAAA472) of cruciferin 1, an isoform of 12S globulins. The 468RVA470 motif forms a parallel ß-sheet with the switch III residues (127TMD129) of VSR1-PA, and the 471AA472 motif docks to a cradle formed by the cargo-binding loop (95RGDCYF100), making a hydrophobic interaction with Tyr99. The C-terminal carboxyl group of the ctVSD is recognized by forming salt bridges with Arg95. The C-terminal sequences of cruciferin 1 and vicilin-like storage protein 22 were sufficient to redirect the secretory red fluorescent protein (spRFP) to the vacuoles in Arabidopsis protoplasts. Adding a proline residue to the C terminus of the ctVSD and R95M substitution of VSR1 disrupted receptor-cargo interactions in vitro and led to increased secretion of spRFP in Arabidopsis protoplasts. How VSR1-PA recognizes ctVSDs of other storage proteins was modeled. The last three residues of ctVSD prefer hydrophobic residues because they form a hydrophobic cluster with Tyr99 of VSR1-PA. Due to charge-charge interactions, conserved acidic residues, Asp129 and Glu132, around the cargo-binding site should prefer basic residues over acidic ones in the ctVSD. The structural insights gained may be useful in targeting recombinant proteins to the protein storage vacuoles in seeds.


Assuntos
Proteínas de Arabidopsis , Arabidopsis , Substituição de Aminoácidos , Arabidopsis/química , Arabidopsis/genética , Arabidopsis/metabolismo , Proteínas de Arabidopsis/química , Proteínas de Arabidopsis/genética , Proteínas de Arabidopsis/metabolismo , Cristalografia por Raios X , Mutação de Sentido Incorreto , Conformação Proteica em Folha beta , Domínios Proteicos , Transporte Proteico , Protoplastos/química , Protoplastos/metabolismo , Proteínas de Armazenamento de Sementes/química , Proteínas de Armazenamento de Sementes/genética , Proteínas de Armazenamento de Sementes/metabolismo , Relação Estrutura-Atividade , Vacúolos/química , Vacúolos/genética , Vacúolos/metabolismo
2.
Small ; : e2400745, 2024 May 28.
Artigo em Inglês | MEDLINE | ID: mdl-38804826

RESUMO

Producing heterostructures of cesium lead halide perovskites and metal-chalcogenides in the form of colloidal nanocrystals can improve their optical features and stability, and also govern the recombination of charge carriers. Herein, the synthesis of red-emitting CsPbI3/ZnSe nanoheterostructures is reported via an in situ hot injection method, which provides the crystallization conditions for both components, subsequently leading to heteroepitaxial growth. Steady-state absorption and photoluminescence studies alongside X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy analysis evidence on a type-I band alignment for CsPbI3/ZnSe nanoheterostructures, which exhibit photoluminescence quantum yield of 96% due to the effective passivation of surface defects, and an enhancement in carrier lifetime. Furthermore, the heterostructure growth of ZnSe domains leads to significant improvement in the stability of the CsPbI3 nanocrystals under ambient conditions and against thermal and UV irradiation stress.

3.
Environ Sci Technol ; 58(29): 12784-12822, 2024 Jul 23.
Artigo em Inglês | MEDLINE | ID: mdl-38984754

RESUMO

In the modern "omics" era, measurement of the human exposome is a critical missing link between genetic drivers and disease outcomes. High-resolution mass spectrometry (HRMS), routinely used in proteomics and metabolomics, has emerged as a leading technology to broadly profile chemical exposure agents and related biomolecules for accurate mass measurement, high sensitivity, rapid data acquisition, and increased resolution of chemical space. Non-targeted approaches are increasingly accessible, supporting a shift from conventional hypothesis-driven, quantitation-centric targeted analyses toward data-driven, hypothesis-generating chemical exposome-wide profiling. However, HRMS-based exposomics encounters unique challenges. New analytical and computational infrastructures are needed to expand the analysis coverage through streamlined, scalable, and harmonized workflows and data pipelines that permit longitudinal chemical exposome tracking, retrospective validation, and multi-omics integration for meaningful health-oriented inferences. In this article, we survey the literature on state-of-the-art HRMS-based technologies, review current analytical workflows and informatic pipelines, and provide an up-to-date reference on exposomic approaches for chemists, toxicologists, epidemiologists, care providers, and stakeholders in health sciences and medicine. We propose efforts to benchmark fit-for-purpose platforms for expanding coverage of chemical space, including gas/liquid chromatography-HRMS (GC-HRMS and LC-HRMS), and discuss opportunities, challenges, and strategies to advance the burgeoning field of the exposome.


Assuntos
Espectrometria de Massas , Humanos , Espectrometria de Massas/métodos , Expossoma , Metabolômica , Proteômica/métodos , Exposição Ambiental
4.
Nucleic Acids Res ; 50(9): 5335-5348, 2022 05 20.
Artigo em Inglês | MEDLINE | ID: mdl-35544198

RESUMO

Eukaryotic uL11 contains a conserved MPPKFDP motif at the N-terminus that is not found in archaeal and bacterial homologs. Here, we determined the solution structure of human uL11 by NMR spectroscopy and characterized its backbone dynamics by 15N-1H relaxation experiments. We showed that these N-terminal residues are unstructured and flexible. Structural comparison with ribosome-bound uL11 suggests that the linker region between the N-terminal domain and C-terminal domain of human uL11 is intrinsically disordered and only becomes structured when bound to the ribosomes. Mutagenesis studies show that the N-terminal conserved MPPKFDP motif is involved in interacting with the P-complex and its extended protuberant domain of uL10 in vitro. Truncation of the MPPKFDP motif also reduced the poly-phenylalanine synthesis in both hybrid ribosome and yeast mutagenesis studies. In addition, G→A/P substitutions to the conserved GPLG motif of helix-1 reduced poly-phenylalanine synthesis to 9-32% in yeast ribosomes. We propose that the flexible N-terminal residues of uL11, which could extend up to ∼25 Šfrom the N-terminal domain of uL11, can form transient interactions with the uL10 that help to fetch and fix it into a position ready for recruiting the incoming translation factors and facilitate protein synthesis.


Assuntos
Biossíntese de Proteínas , Saccharomyces cerevisiae , Células Eucarióticas/metabolismo , Humanos , Fenilalanina/metabolismo , Ribossomos/metabolismo , Saccharomyces cerevisiae/genética
5.
Proc Natl Acad Sci U S A ; 118(17)2021 04 27.
Artigo em Inglês | MEDLINE | ID: mdl-33879613

RESUMO

In eukaryotes, secretory proteins traffic from the endoplasmic reticulum (ER) to the Golgi apparatus via coat protein complex II (COPII) vesicles. Intriguingly, during nutrient starvation, the COPII machinery acts constructively as a membrane source for autophagosomes during autophagy to maintain cellular homeostasis by recycling intermediate metabolites. In higher plants, essential roles of autophagy have been implicated in plant development and stress responses. Nonetheless, the membrane sources of autophagosomes, especially the participation of the COPII machinery in the autophagic pathway and autophagosome biogenesis, remains elusive in plants. Here, we provided evidence in support of a novel role of a specific Sar1 homolog AtSar1d in plant autophagy in concert with a unique Rab1/Ypt1 homolog AtRabD2a. First, proteomic analysis of the plant ATG (autophagy-related gene) interactome uncovered the mechanistic connections between ATG machinery and specific COPII components including AtSar1d and Sec23s, while a dominant negative mutant of AtSar1d exhibited distinct inhibition on YFP-ATG8 vacuolar degradation upon autophagic induction. Second, a transfer DNA insertion mutant of AtSar1d displayed starvation-related phenotypes. Third, AtSar1d regulated autophagosome progression through specific recognition of ATG8e by a noncanonical motif. Fourth, we demonstrated that a plant-unique Rab1/Ypt1 homolog AtRabD2a coordinates with AtSar1d to function as the molecular switch in mediating the COPII functions in the autophagy pathway. AtRabD2a appears to be essential for bridging the specific AtSar1d-positive COPII vesicles to the autophagy initiation complex and therefore contributes to autophagosome formation in plants. Taken together, we identified a plant-specific nexus of AtSar1d-AtRabD2a in regulating autophagosome biogenesis.


Assuntos
Proteínas de Arabidopsis/metabolismo , Vesículas Revestidas pelo Complexo de Proteína do Envoltório/metabolismo , Proteínas R-SNARE/metabolismo , Proteínas rab de Ligação ao GTP/metabolismo , Arabidopsis/metabolismo , Proteínas de Arabidopsis/fisiologia , Autofagossomos/metabolismo , Autofagia/fisiologia , Vesículas Revestidas pelo Complexo de Proteína do Envoltório/fisiologia , Retículo Endoplasmático/metabolismo , Complexo de Golgi/metabolismo , Fagossomos/metabolismo , Transporte Proteico/fisiologia , Proteômica/métodos , Proteínas R-SNARE/fisiologia , Vacúolos/metabolismo , Proteínas de Transporte Vesicular/metabolismo , Proteínas rab de Ligação ao GTP/fisiologia
6.
J Integr Plant Biol ; 66(5): 1007-1023, 2024 May.
Artigo em Inglês | MEDLINE | ID: mdl-38501483

RESUMO

In plants, thousands of nucleus-encoded proteins translated in the cytosol are sorted to chloroplasts and mitochondria by binding to specific receptors of the TOC (translocon on the outer chloroplast membrane) and the TOM (translocon on the outer mitochondrial membrane) complexes for import into those organelles. The degradation pathways for these receptors are unclear. Here, we discovered a converged ubiquitin-proteasome pathway for the degradation of Arabidopsis thaliana TOC and TOM tail-anchored receptors. The receptors are ubiquitinated by E3 ligase(s) and pulled from the outer membranes by the AAA+ adenosine triphosphatase CDC48, after which a previously uncharacterized cytosolic protein, transmembrane domain (TMD)-binding protein for tail-anchored outer membrane proteins (TTOP), binds to the exposed TMDs at the C termini of the receptors and CDC48, and delivers these complexes to the 26S proteasome.


Assuntos
Proteínas de Arabidopsis , Arabidopsis , Complexo de Endopeptidases do Proteassoma , Ubiquitina , Complexo de Endopeptidases do Proteassoma/metabolismo , Proteínas de Arabidopsis/metabolismo , Arabidopsis/metabolismo , Ubiquitina/metabolismo , Proteólise , Proteína com Valosina/metabolismo
7.
New Phytol ; 240(1): 41-60, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37507353

RESUMO

The endomembrane system consists of various membrane-bound organelles including the endoplasmic reticulum (ER), Golgi apparatus, trans-Golgi network (TGN), endosomes, and the lysosome/vacuole. Membrane trafficking between distinct compartments is mainly achieved by vesicular transport. As the endomembrane compartments and the machineries regulating the membrane trafficking are largely conserved across all eukaryotes, our current knowledge on organelle biogenesis and endomembrane trafficking in plants has mainly been shaped by corresponding studies in mammals and yeast. However, unique perspectives have emerged from plant cell biology research through the characterization of plant-specific regulators as well as the development and application of the state-of-the-art microscopical techniques. In this review, we summarize our current knowledge on the plant endomembrane system, with a focus on several distinct pathways: ER-to-Golgi transport, protein sorting at the TGN, endosomal sorting on multivesicular bodies, vacuolar trafficking/vacuole biogenesis, and the autophagy pathway. We also give an update on advanced imaging techniques for the plant cell biology research.


Assuntos
Endossomos , Plantas , Plantas/metabolismo , Endossomos/metabolismo , Vacúolos/metabolismo , Corpos Multivesiculares/metabolismo , Transporte Proteico , Complexo de Golgi/metabolismo , Rede trans-Golgi/metabolismo
8.
Langenbecks Arch Surg ; 408(1): 118, 2023 Mar 14.
Artigo em Inglês | MEDLINE | ID: mdl-36917309

RESUMO

PURPOSE: To compare the peri-operative and long-term survival outcomes of minimally invasive liver resection (MILR) (robotic or laparoscopic) with open liver resection (OLR) in patients with hepatocellular carcinoma (HCC). METHODS: Data of patients who underwent liver resection for HCC were reviewed from a prospectively collected database. Outcomes of MILR were compared with those of OLR. A propensity score matching analysis with a ratio of 1:1 was performed to minimise the potential bias in clinical pathological factors. RESULTS: From January 2003 to December 2017, a total of 705 patients underwent liver resection for HCC. Amongst them, 112 patients received MILR and 593 patients received OLR. After propensity score matching, there were 112 patients in each of the MILR and OLR groups. Patients were matched by age, sex, hepatitis status, presence of cirrhosis, platelet count, albumin level, bilirubin level, alkaline phosphatase (ALP) level, alanine transferase (ALT) level, creatinine level, tumour differentiation, tumour size, tumour number, presence of tumour rupture, presence of vascular invasion, extent of liver resection (minor/major) and difficulty score. The 1-, 3- and 5-year overall survival rates were 94.4%, 90.4% and 82.3% in the MILR group vs 95.4%, 80.5% and 71.8% in the open group (p = 0.240). The 1-, 3- and 5-year disease-free survival rates were 81.0%, 63.1% and 55.8% in the MILR group vs 79.1%, 58.1% and 45.7 in the open group (p = 0.449). The MILR group demonstrated significantly less blood loss (p < 0.001), less blood transfusion (p = 0.004), lower post-operative complications (p < 0.001) and shorter hospital stay (p < 0.001) when compared with the OLR group. CONCLUSIONS: Our data shows MILR yielded superior post-operative outcomes to OLR, with comparable survival outcomes.


Assuntos
Carcinoma Hepatocelular , Hepatectomia , Fígado , Humanos , Fígado/cirurgia , Carcinoma Hepatocelular/cirurgia , Pontuação de Propensão , Procedimentos Cirúrgicos Minimamente Invasivos , Procedimentos Cirúrgicos Robóticos , Laparoscopia , Taxa de Sobrevida , Hepatectomia/métodos , Masculino , Feminino , Pessoa de Meia-Idade , Idoso , Tempo de Internação , Complicações Pós-Operatórias/epidemiologia , Hemorragia Pós-Operatória/epidemiologia , Transfusão de Sangue , Recidiva Local de Neoplasia/epidemiologia
9.
Eur Spine J ; 32(7): 2282-2287, 2023 07.
Artigo em Inglês | MEDLINE | ID: mdl-37148391

RESUMO

PURPOSE: To evaluate the prophylactic use of Floseal in reducing postoperative blood loss in patients undergoing Transforaminal Lumbar Interbody Fusion (TLIF). TLIF is a lumbar spine decompression and fusion procedure with potential for postoperative blood loss. Prophylactic application of Floseal, a gelatin and thrombin-based haemostatic matrix to the surgical wound before closure was shown to be effective in reducing postoperative drain output in anterior cervical discectomy and fusion. This study postulated that prophylactic use of Floseal before wound closure would reduce postoperative blood loss in patients who underwent TLIF. METHODS: Randomised controlled trial comparing prophylactic use of Floseal and control in patients undergoing single level or two-level TLIF. Primary outcomes included postoperative drain output within 24 h and postoperative transfusion rate. Secondary outcomes included days of drain placement, length of stay and haemoglobin level. RESULTS: A total of 50 patients was recruited. Twenty six patients were allocated to the Floseal group and 24 were allocated to the control group. There were no baseline characteristic differences between the groups. There were no statistically significant differences in primary outcomes which included postoperative drain output within 24 h and postoperative transfusion rate between patients who received prophylactic Floseal and control. There were no statistically significant differences in secondary outcomes which included haemoglobin level, days of drain placement and length of stay between the two groups. CONCLUSION: Prophylactic use of Floseal was not shown to reduce postoperative bleeding in single level or two-level TLIF.


Assuntos
Hemostáticos , Fusão Vertebral , Humanos , Hemostáticos/uso terapêutico , Gelatina/uso terapêutico , Trombina/uso terapêutico , Vértebras Lombares/cirurgia , Estudos Prospectivos , Fusão Vertebral/efeitos adversos , Fusão Vertebral/métodos , Hemorragia Pós-Operatória/prevenção & controle , Transfusão de Sangue , Hemoglobinas , Procedimentos Cirúrgicos Minimamente Invasivos , Estudos Retrospectivos , Resultado do Tratamento
10.
Int J Technol Assess Health Care ; 39(1): e12, 2023 Feb 14.
Artigo em Inglês | MEDLINE | ID: mdl-36786028

RESUMO

OBJECTIVES: Health service providers are currently making decisions on the public funding of digital health technologies (DHTs) for managing chronic diseases with limited understanding of stakeholder preferences for DHT attributes. This study aims to understand the community, patient/carer, and health professionals' preferences to help inform a prioritized list of evaluation criteria. METHODS: An online best-worst scaling survey was conducted in Australia, New Zealand, Canada, and the United Kingdom to ascertain the relative importance of twenty-four DHT attributes among stakeholder groups using an efficient incomplete block design. The attributes were identified from a systematic review of DHT evaluation frameworks for consideration in a health technology assessment. Results were analyzed with multinomial models by stakeholder group and latent class. RESULTS: A total of 1,251 participants completed the survey (576 general community members, 543 patients/carers, and 132 health professionals). Twelve attributes achieved a preference score above 50 percent in the stakeholder group model, predominantly related to safety but also covering technical features, effectiveness, ethics, and economics. Results from the latent class model supported this prioritization. Overall, connectedness with the patient's healthcare team seemed the most important; with "Helps health professionals respond quickly when changes in patient care are needed" as the most highly prioritized of all attributes. CONCLUSIONS: It is proposed that these prioritized twelve attributes be considered in all evaluations of DHTs that manage chronic disease, supplemented with a limited number of attributes that reflect the specific perspective of funders, such as equity of access, cost, and system-level implementation considerations.


Assuntos
Tomada de Decisões , Pessoal de Saúde , Humanos , Austrália , Cuidadores , Serviços de Saúde
11.
Aust J Rural Health ; 31(4): 776-781, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-37243842

RESUMO

OBJECTIVE: To explore the benefits and challenges of electronic prescribing (e-prescribing) for general practitioners (GPs) and pharmacists in regional New South Wales (NSW). METHODS: This qualitative study utilised semistructured interviews conducted virtually or in-person between July and September 2021. SETTING AND PARTICIPANTS: General practitioners and pharmacists practising in Bathurst NSW. MAIN OUTCOMES: Self-reported perceived and experienced benefits and challenges of e-prescribing. RESULTS: Two GPs and four pharmacists participated in the study. Reported benefits of e-prescribing included improvement in the prescribing and dispensing process, patient adherence, and prescription safety and security. The increased convenience for the patients was appreciated particularly during the COVID-19 pandemic. Challenges discussed were how the system was perceived to be unsafe and insecure, costs of messaging and updating general practice software, utilisation of new systems and patient awareness. Pharmacists reported the need for education to patients and staff to minimise the impact of inexperience with the novel technology on workflow efficacy. CONCLUSION: This study provided first insight and information on the perspectives of GPs and pharmacists 12 months after the implementation of e-prescribing. Further nationwide studies are required to consolidate these findings; provide comparisons with the system's progress since conception; determine whether metropolitan and rural health care professionals share similar perspectives; and shed light on where additional government support may be required.


Assuntos
COVID-19 , Prescrição Eletrônica , Clínicos Gerais , Humanos , Farmacêuticos , Pandemias , Austrália , Atitude do Pessoal de Saúde
12.
Semin Cell Dev Biol ; 101: 41-50, 2020 05.
Artigo em Inglês | MEDLINE | ID: mdl-31408699

RESUMO

Autophagy is a conserved intracellular degradation process enclosing the bulk of cytosolic components for lysosomal degradation to maintain cellular homeostasis. Accumulating evidences showed that a specialized form of autophagy, known as xenophagy, could serve as an innate immune response to defend against pathogens invading inside the host cells. Correspondingly, infectious pathogens have developed a variety of strategies to disarm xenophagy, leading to a prolonged and persistent intracellular colonization. In this review, we first summarize the current knowledge about the general mechanisms of intracellular bacterial infections and xenophagy. We then focus on the ongoing battle between these two processes.


Assuntos
Autofagia/imunologia , Infecções Bacterianas/imunologia , Animais , Infecções Bacterianas/patologia , Humanos , Imunidade Inata/imunologia
13.
J Biol Chem ; 297(2): 100925, 2021 08.
Artigo em Inglês | MEDLINE | ID: mdl-34214498

RESUMO

Apart from prevention using vaccinations, the management options for COVID-19 remain limited. In retrospective cohort studies, use of famotidine, a specific oral H2 receptor antagonist (antihistamine), has been associated with reduced risk of intubation and death in patients hospitalized with COVID-19. In a case series, nonhospitalized patients with COVID-19 experienced rapid symptom resolution after taking famotidine, but the molecular basis of these observations remains elusive. Here we show using biochemical, cellular, and functional assays that famotidine has no effect on viral replication or viral protease activity. However, famotidine can affect histamine-induced signaling processes in infected Caco2 cells. Specifically, famotidine treatment inhibits histamine-induced expression of Toll-like receptor 3 (TLR3) in SARS-CoV-2 infected cells and can reduce TLR3-dependent signaling processes that culminate in activation of IRF3 and the NF-κB pathway, subsequently controlling antiviral and inflammatory responses. SARS-CoV-2-infected cells treated with famotidine demonstrate reduced expression levels of the inflammatory mediators CCL-2 and IL6, drivers of the cytokine release syndrome that precipitates poor outcome for patients with COVID-19. Given that pharmacokinetic studies indicate that famotidine can reach concentrations in blood that suffice to antagonize histamine H2 receptors expressed in mast cells, neutrophils, and eosinophils, these observations explain how famotidine may contribute to the reduced histamine-induced inflammation and cytokine release, thereby improving the outcome for patients with COVID-19.


Assuntos
Famotidina/farmacologia , Antagonistas dos Receptores Histamínicos/farmacologia , SARS-CoV-2/efeitos dos fármacos , Receptor 3 Toll-Like/metabolismo , Células A549 , Sítios de Ligação , Células CACO-2 , Quimiocina CCL2/metabolismo , Proteases 3C de Coronavírus/metabolismo , Células HeLa , Humanos , Fator Regulador 3 de Interferon/metabolismo , Interleucina-6/metabolismo , Simulação de Acoplamento Molecular , NF-kappa B/metabolismo , Ligação Proteica , SARS-CoV-2/fisiologia , Transdução de Sinais , Receptor 3 Toll-Like/química , Replicação Viral
14.
Small ; 18(7): e2105196, 2022 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-34874619

RESUMO

Integration of photovoltaic (PV) and electroluminescent (EL) functions and/or units in one device is attractive for new generation optoelectronic devices but it is challenging to achieve highly comprehensive efficiency. Herein, perovskite solar cells (PSCs) are fabricated, assisted by 3-sulfopropyl methacrylate potassium salt (SPM) additive to tackle this issue. SPMs not only induce large grain size during the film formation but also produce a secondary phase of 2D K2 PbI4 to passivate the grain boundaries (GBs). In addition, its sulfonic acid group and potassium ion can coordinate to lead ion and fill the interstitial defects, respectively. Thus, SPM reduces the defective states and suppresses nonradiative recombination loss. As a result, planar PSC delivers a power conversion efficiency of ≈22%, with a maximum open-circuit voltage (Voc ) of 1.20 V. The Voc is 94% of the radiative Voc limit (1.28 V), higher than the control device (Voc of 1.12 V). In addition, the reciprocity between PV and EL is also correlated to quantify the energy losses and understand the device physics. When operated as a light-emitting diode, the maximum EL external quantum efficiency (EQEEL ) is up to 12.2% (EQEEL of 10.7% under an injection current of short-circuit photocurrent), thus leading to high-performance PV/EL dual functions.

15.
Small ; 18(18): e2107145, 2022 May.
Artigo em Inglês | MEDLINE | ID: mdl-35373469

RESUMO

Integrating highly efficient photovoltaic (PV) function into light-emitting diodes (LEDs) for multifunctional display is of great significance for compact low-power electronics, but it remains challenging. Herein, it is demonstrated that solution engineered perovskite nanocrystals (PNCs, ≈100 nm) enable efficient electroluminescence (EL) and PV performance within a single device through tailoring the dispersity and interface. It delivers the maximum brightness of 490 W sr-1  m-2 at 2.7 V and 23.2% EL external quantum efficiency, a record value for near-infrared perovskite LED, as well as 15.23% PV efficiency, among the highest value for nanocrystal perovskite solar cells. The PV-EL performance is well in line with the reciprocity relation. These all-solution-processed PV-LED devices open up viable routes to a variety of advanced applications, from touchless interactive screens to energy harvesting displays and data communication.

16.
New Phytol ; 233(5): 2249-2265, 2022 03.
Artigo em Inglês | MEDLINE | ID: mdl-34918346

RESUMO

Plants use pattern recognition receptors (PRRs) to detect pathogen-associated molecular patterns (PAMPs) and activate pattern-triggered immunity (PTI). Precise regulation of information from PRRs to downstream signaling components is vital to mounting an appropriate immune response and requires dynamic interactions of these PTI components. We used transcriptome profiling, phenotypic analysis, molecular genetics, and protein-protein interaction analysis to understand the roles of the Arabidopsis plant U-box (PUB) proteins PUB2 and PUB4 in disease resistance and PTI signaling. Loss of function of both PUB2 and PUB4 diminishes the PAMP-triggered oxidative bursts and dampens mitogen-activated protein kinase signaling, resulting in a severe compromise in resistance to not only pathogenic but also nonpathogenic strains of Pseudomonas syringae. Within PUB4, the E3 ligase activity is dispensable, but the armadillo repeat region is essential and sufficient for its function in immunity. PUB2 and PUB4 interact with PTI signaling components, including FLS2, BIK1, PBL27, and RbohD, and enhance FLS2-BIK1 and BIK1-RbohD interactions. Our study reveals that PUB2 and PUB4 are critical components of plant immunity and connect PTI components to positively regulate defense responses.


Assuntos
Proteínas de Arabidopsis , Arabidopsis , Doenças das Plantas , Ubiquitina-Proteína Ligases , Arabidopsis/imunologia , Proteínas de Arabidopsis/imunologia , Doenças das Plantas/imunologia , Doenças das Plantas/microbiologia , Imunidade Vegetal , Pseudomonas syringae/fisiologia , Ubiquitina-Proteína Ligases/imunologia
17.
Inorg Chem ; 61(28): 10950-10956, 2022 Jul 18.
Artigo em Inglês | MEDLINE | ID: mdl-35772078

RESUMO

All-inorganic copper(I)-based metal halides have emerged as promising candidates for the replacement of lead perovskites because of their outstanding optical properties. However, the limited structure tunability prohibits their further exploration of properties including red photoluminescence (PL). Here, we report a series of red-emissive lead-free hybrid organic-inorganic copper halides A6(C4H8OS)12[Cu8X13][Cu4X4(OH)(H2O)] (ACX-THTO, A = K, Rb, and Cs; X = Cl, Br; THTO = C4H8OS) with the highest photoluminescence quantum yield (PLQY) of 42%. These compounds possess similar crystal structures, and their emission can be tuned in the spectral range of 676-732 nm by controlling their compositions. Additionally, by removing and adding THTO, the reversible transformation between CsCu2Br3 featuring one-dimensional (1D) chains and Cs6(C4H8OS)12[Cu8Br13][Cu4Br4(OH)(H2O)] (CCB-THTO) with zero-dimensional (0D) clusters can be realized. We also demonstrate that the incorporation of THTO in the crystal structures instead of dimethyl sulfoxide (DMSO) can significantly enhance the stability and PL of compounds with the same inorganic components.

18.
Nature ; 529(7586): 358-363, 2016 Jan 21.
Artigo em Inglês | MEDLINE | ID: mdl-26760206

RESUMO

Degeneracy in the genetic code, which enables a single protein to be encoded by a multitude of synonymous gene sequences, has an important role in regulating protein expression, but substantial uncertainty exists concerning the details of this phenomenon. Here we analyse the sequence features influencing protein expression levels in 6,348 experiments using bacteriophage T7 polymerase to synthesize messenger RNA in Escherichia coli. Logistic regression yields a new codon-influence metric that correlates only weakly with genomic codon-usage frequency, but strongly with global physiological protein concentrations and also mRNA concentrations and lifetimes in vivo. Overall, the codon content influences protein expression more strongly than mRNA-folding parameters, although the latter dominate in the initial ~16 codons. Genes redesigned based on our analyses are transcribed with unaltered efficiency but translated with higher efficiency in vitro. The less efficiently translated native sequences show greatly reduced mRNA levels in vivo. Our results suggest that codon content modulates a kinetic competition between protein elongation and mRNA degradation that is a central feature of the physiology and also possibly the regulation of translation in E. coli.


Assuntos
Códon/genética , Proteínas de Escherichia coli/genética , Escherichia coli/genética , Regulação Bacteriana da Expressão Gênica/genética , Biossíntese de Proteínas/genética , RNA Bacteriano/metabolismo , RNA Mensageiro/metabolismo , RNA Polimerases Dirigidas por DNA/metabolismo , Escherichia coli/metabolismo , Proteínas de Escherichia coli/biossíntese , Genes Sintéticos/genética , Meia-Vida , Cinética , Modelos Logísticos , Modelos Genéticos , Dados de Sequência Molecular , Razão de Chances , Elongação Traducional da Cadeia Peptídica , Dobramento de RNA , Estabilidade de RNA , RNA Bacteriano/genética , RNA Mensageiro/genética , Transcrição Gênica/genética , Proteínas Virais/metabolismo
19.
Angew Chem Int Ed Engl ; 61(46): e202206930, 2022 Nov 14.
Artigo em Inglês | MEDLINE | ID: mdl-36125387

RESUMO

Central π-core engineering of non-fullerene small molecule acceptors (NF-SMAs) is effective in boosting the performance of organic solar cells (OSCs). Especially, selenium (Se) functionalization of NF-SMAs is considered a promising strategy but the structure-performance relationship remains unclear. Here, we synthesize two isomeric alkylphenyl-substituted selenopheno[3,2-b]thiophene-based NF-SMAs named mPh4F-TS and mPh4F-ST with different substitution positions, and contrast them with the thieno[3,2-b]thiophene-based analogue, mPh4F-TT. When placing Se atoms at the outer positions of the π-core, mPh4F-TS shows the most red-shifted absorption and compact molecular stacking. The PM6 : mPh4F-TS devices exhibit excellent absorption, high charge carrier mobility, and reduced energy loss. Consequently, PM6 : mPh4F-TS achieves more balanced photovoltaic parameters and yields an efficiency of 18.05 %, which highlights that precisely manipulating selenium functionalization is a practicable way toward high-efficiency OSCs.

20.
Angew Chem Int Ed Engl ; 61(49): e202211298, 2022 12 05.
Artigo em Inglês | MEDLINE | ID: mdl-36207766

RESUMO

Due to the fast dynamics and re-equilibration of supramolecular self-assembly, bottom-up molecular strategies to fabricate well-defined and controllable multiblock structures are rare. Herein, we propose a new concept for fabrication of fluorescent multiblock microcolumns containing 1 to 7 blocks via hierarchical supramolecular self-assembly based on cucurbit[8]uril (CB[8]), NaBr and an AIEgen guest. Through the complexation between CB[8] and different numbers of AIEgen guests (2, 1, 0), the competitive displacement caused by the binding of the sodium cation to the CB[8] portal, and the reversible assembly of positively charged guests in salt solutions, one-pot hierarchical supramolecular self-assembly is realized. The molecular structure of each block is analyzed by single-crystal X-ray diffraction. The AIEgen enables the self-assembly of multiblocks to be visualized, understood, and regulated.


Assuntos
Hidrocarbonetos Aromáticos com Pontes , Imidazóis , Hidrocarbonetos Aromáticos com Pontes/química , Imidazóis/química , Estrutura Molecular , Cristalografia por Raios X , Íons
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA