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1.
Mol Ecol Resour ; 23(8): 1853-1867, 2023 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-37486074

RESUMEN

Previous studies have deciphered the genomic basis of host-symbiont metabolic complementarity in vestimentiferans, bathymodioline mussels, vesicomyid clams and Alviniconcha snails, yet little is known about the chemosynthetic symbiosis in Thyasiridae-a family of Bivalvia regarded as an excellent model in chemosymbiosis research due to their wide distribution in both deep-sea and shallow-water habitats. We report the first circular thyasirid symbiont genome, named Candidatus Ruthturnera sp. Tsphm01, with a size of 1.53 Mb, 1521 coding genes and 100% completeness. Compared to its free-living relatives, Ca. Ruthturnera sp. Tsphm01 genome is reduced, lacking components for chemotaxis, citric acid cycle and de novo biosynthesis of small molecules (e.g. amino acids and cofactors), indicating it is likely an obligate intracellular symbiont. Nevertheless, the symbiont retains complete genomic components of sulphur oxidation and assimilation of inorganic carbon, and these systems were highly and actively expressed. Moreover, the symbiont appears well-adapted to anoxic environment, including capable of anaerobic respiration (i.e. reductions of DMSO and nitrate) and possession of a low oxygen-adapted type of cytochrome c oxidase. Analysis of the host transcriptome revealed its metabolic complementarity to the incomplete metabolic pathways of the symbiont and the acquisition of nutrients from the symbiont via phagocytosis and exosome. By providing the first complete genome of reduced size in a thyasirid symbiont, this study enhances our understanding of the diversity of symbiosis that has enabled bivalves to thrive in chemosynthetic habitats. The resources will be widely used in phylogenetic, geographic and evolutionary studies of chemosynthetic bacteria and bivalves.


Asunto(s)
Bivalvos , Metano , Animales , Filogenia , Anaerobiosis , Genoma , Bivalvos/genética , Simbiosis/genética
2.
Materials (Basel) ; 15(24)2022 Dec 11.
Artículo en Inglés | MEDLINE | ID: mdl-36556653

RESUMEN

Semiconductor-based composites are potential anodes for Li-ion batteries, owing to their high theoretical capacity and low cost. However, low stability induced by large volumetric change in cycling restricts the applications of such composites. Here, a hierarchical SnO2@Ni6MnO8 composite comprising Ni6MnO8 nanoflakes growing on the surface of a three-dimensional (3D) SnO2 is developed by a hydrothermal synthesis method, achieving good electrochemical performance as a Li-ion battery anode. The composite provides spaces to buffer volume expansion, its hierarchical profile benefits the fast transport of Li+ ions and electrons, and the Ni6MnO8 coating on SnO2 improves conductivity. Compared to SnO2, the Ni6MnO8 coating significantly enhances the discharge capacity and stability. The SnO2@Ni6MnO8 anode displays 1030 mAh g-1 at 0.1 A g-1 and exhibits 800 mAh g-1 under 0.5 A g-1, along with high Coulombic efficiency of 95%. Furthermore, stable rate performance can be achieved, indicating promising applications.

3.
Water Res ; 225: 119125, 2022 Oct 15.
Artículo en Inglés | MEDLINE | ID: mdl-36152444

RESUMEN

Lake Taihu suffers from severe algal blooms every year, which is attributed primarily to the release of sediment phosphorus (P), namely the internal P loading. However, the overall internal P loading and the P hotspots in sediment have not been fully studied. This paper presents several methods, including sequential P extraction, the use of diffusive gradient in thin film (DGT), and intact core incubation to give a detailed investigation of sediment internal P loading as well as its roles in algal dominated zones (ADZs) and grass dominated zones (GDZs) in Lake Taihu. Sediment microbial composition was also analyzed to investigate its relationship with P fractions. The results indicate that the total P and the mobile P fraction in the ADZ sediments are generally higher than those of the GDZ sediments. The percentage of sediment mobile P to TP is similar to the mobile P in their distributions. In contrast, calcium bound P accounts for most of the TP in GDZ, while mobile P contributes the most to TP in ADZ. Overall, sediment can release 256 tons of TP and 217 tons of soluble reactive phosphorus (SRP) over a period of six months in the warmer seasons. Similarly, a high concentration of DGT-measured P was observed in ADZs that are recognized as P hotspots in Lake Taihu. Sediments in ADZ and GDZ was dominated by the bacteria Firmicutes and Proteobacteria, respectively and which were closely related with mobile P and calcium bound P in sediment, respectively. GZD seems to be able to retain more P in sediments, thereby reducing its contribution to of internal P loading. These results indicate that the difference in sediment composition between ADZ and GDZ affects their roles in sediment internal P loading, therefore, different management strategies should be used to combat sediment internal P loads in the two zones.


Asunto(s)
Lagos , Contaminantes Químicos del Agua , Fósforo/análisis , Sedimentos Geológicos , Calcio , Monitoreo del Ambiente/métodos , Contaminantes Químicos del Agua/análisis , Plantas , China , Eutrofización
4.
J Org Chem ; 87(6): 4424-4437, 2022 Mar 18.
Artículo en Inglés | MEDLINE | ID: mdl-35262359

RESUMEN

A concise synthetic route to spiroindoline-fused S-heterocycles was developed through copper-catalyzed [4 + 1] annulation using enaminothiones as donor-acceptor synthons. Both 3-diazoindolin-2-imines and 3-diazooxindoles were amenable to work as effective C1 building blocks. The reaction proceeds via a copper-catalyzed cascade process involving the in situ generation of copper(I) carbene and C-S/C-C bond formation. This synthetic protocol features the use of readily available substrates, diverse substituent tolerance, and good to excellent yields.

5.
Dev Comp Immunol ; 128: 104313, 2022 03.
Artículo en Inglés | MEDLINE | ID: mdl-34762937

RESUMEN

Down syndrome cell adhesion molecule (Dscam), also called hypervariable Dscam (Dscam-hv), is an important player in arthropod alternative splicing that connects neurons and immune regulation, acting as a pathogen-specific recognition molecule. Dscam-hv has two forms: transmembrane (TM) Dscam (mDscam) and soluble Dscam (sDscam). Herein, we investigated two transmembrane variants of mDscam resulting from alternative splicing of the transmembrane domain, focusing on differences in their immune regulation. We characterized the Dscam[TM1] and Dscam[TM2] genes of Chinese mitten crab (Eriocheir sinensis) through bioinformatics analysis. Both genes are expressed in the gill, intestine, and other immune tissues. Following gram-positive and gram-negative bacteria stimulation, EsDscam[TM1] and EsDscam[TM2] mRNA expression levels increased significantly in hemocytes. Sequencing showed that EsDscam[TM1] was more abundant in hemocytes than EsDscam[TM2]. Additionally, the two subtypes differ in their regulation of antimicrobial peptides, the proportion of exon 33 carried, and bacterial phagocytosis.


Asunto(s)
Braquiuros , Moléculas de Adhesión Celular , Animales , Proteínas de Artrópodos/metabolismo , Moléculas de Adhesión Celular/genética , Moléculas de Adhesión Celular/inmunología , Moléculas de Adhesión Celular/metabolismo , China , Bacterias Gramnegativas/inmunología , Bacterias Grampositivas/inmunología , Hemocitos/metabolismo , Filogenia
6.
Environ Pollut ; 292(Pt B): 118471, 2022 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-34774673

RESUMEN

Sediment phosphorus (P) release and retention are important in controlling whole-system P dynamics and budget in eutrophic lakes. Here we combine short- (seasonal) and long-term (years to decades) studies to quantify the internal P loading and P release potential in the sediments of Lake Chaohu and explore their controlling mechanisms. In the west region of the lake, short-term P diffusive fluxes ranged from 0.2 mg/m2·d-1 to 6.69 mg/m2·d-1 (averaged 2.76 mg/m2·d-1) and long-term net P release ranged from 2.25 mg/m2·d-1 to 8.94 mg/m2·d-1 (averaged 5.34 mg/m2·d-1); in the east region, short-term P diffusive fluxes varied from 0.73 mg/m2·d-1 to 1.76 mg/m2·d-1 (averaged 1.05 mg/m2·d-1) and long-term P release ranged from 0.13 mg/m2·d-1 to 4.15 mg/m2·d-1 (averaged 1.3 mg/m2·d-1). Both short- and long-term P releases were in the same order of magnitudes as the external P inputs (3.56 mg/m2·d-1). Comparison of the long-term and short-term sediment P release indicates that while the high summer P release in the east might only represent a snapshot value, the sediments in the west contribute to large P release for years or even decades, impeding water quality recovery under lake management. Mobilization of surface sediment legacy P accounted for 81% of short-term P release. The long-term release was dominated by remobilization of iron bond P (BD-P) (average 52.1%) at all sites, while Aluminium-bound P (NaOH-rP) exhibited partly reactive and potentially mobile, releasing P to the water column in most sites in the west. Our study demonstrates the importance of sediments as P sources in lake Chaohu. The combination of short- and long-term P release studies can help understand the roles of sediments in regulating the water quality and eutrophication.


Asunto(s)
Lagos , Contaminantes Químicos del Agua , China , Monitoreo del Ambiente , Eutrofización , Sedimentos Geológicos , Fósforo/análisis , Contaminantes Químicos del Agua/análisis
7.
BMC Psychiatry ; 21(1): 623, 2021 12 11.
Artículo en Inglés | MEDLINE | ID: mdl-34895185

RESUMEN

BACKGROUND: The neurodevelopmental model of obsessive-compulsive disorder (OCD) suggests that the neurodevelopmental changes in the ventral striatal circuit of the prefrontal lobe are associated with the initial symptoms of OCD. Facial morphology is one of the most consistent anatomical phenotypes of neurodevelopmental disorders, which can reflect brain structure and function. Facial deformity, an easily measured index of brain malformation, can reflect abnormal brain structure and function. Therefore, this study aims to explore the relationship between clinical features and neurodevelopment of adolescents with OCD through facial morphology. METHODS: The enrolled study sample comprised 40 adolescents diagnosed with OCD using the Obsessive Compulsive Inventory-Child Version (OCI-CV) and 38 healthy controls (HCs). Facial photos, 21 facial diameters, and 9 facial angles were collected using image software. RESULTS: In males, lower lip red height was significantly lower in OCD patients than in HCs (P < 0.025); no significant differences were observed in other facial indicators (all P > 0.025). In females, the nasolabial angle was smaller in OCD patients than in HCs (P < 0.025); no significant differences were observed in other facial indicators (all P > 0.025). The difference in lower lip red height between the OCD group and HC group was positively correlated with neutralizing symptoms (r = 0.401, P < 0.05). CONCLUSIONS: Male OCD patients had a thinner lower lip and female OCD patients had smaller nasolabial angles. The facial features of adolescents with OCD were positively correlated with lower lip redness and neutralizing symptoms.


Asunto(s)
Trastorno Obsesivo Compulsivo , Adolescente , Encéfalo , Femenino , Humanos , Masculino , Trastorno Obsesivo Compulsivo/diagnóstico
8.
Plant Physiol ; 186(4): 1786-1799, 2021 08 03.
Artículo en Inglés | MEDLINE | ID: mdl-34618108

RESUMEN

The proper biogenesis, morphogenesis, and dynamics of subcellular organelles are essential to their metabolic functions. Conventional techniques for identifying, classifying, and quantifying abnormalities in organelle morphology are largely manual and time-consuming, and require specific expertise. Deep learning has the potential to revolutionize image-based screens by greatly improving their scope, speed, and efficiency. Here, we used transfer learning and a convolutional neural network (CNN) to analyze over 47,000 confocal microscopy images from Arabidopsis wild-type and mutant plants with abnormal division of one of three essential energy organelles: chloroplasts, mitochondria, or peroxisomes. We have built a deep-learning framework, DeepLearnMOR (Deep Learning of the Morphology of Organelles), which can rapidly classify image categories and identify abnormalities in organelle morphology with over 97% accuracy. Feature visualization analysis identified important features used by the CNN to predict morphological abnormalities, and visual clues helped to better understand the decision-making process, thereby validating the reliability and interpretability of the neural network. This framework establishes a foundation for future larger-scale research with broader scopes and greater data set diversity and heterogeneity.


Asunto(s)
Diseño Asistido por Computadora , Aprendizaje Profundo , Redes Neurales de la Computación , Plantas/anatomía & histología , Fluorescencia , Orgánulos , Células Vegetales , Reproducibilidad de los Resultados
9.
Proc Natl Acad Sci U S A ; 118(6)2021 02 09.
Artículo en Inglés | MEDLINE | ID: mdl-33495360

RESUMEN

The productivity of aquatic ecosystems depends on the supply of limiting nutrients. The invasion of the Laurentian Great Lakes, the world's largest freshwater ecosystem, by dreissenid (zebra and quagga) mussels has dramatically altered the ecology of these lakes. A key open question is how dreissenids affect the cycling of phosphorus (P), the nutrient that limits productivity in the Great Lakes. We show that a single species, the quagga mussel, is now the primary regulator of P cycling in the lower four Great Lakes. By virtue of their enormous biomass, quagga mussels sequester large quantities of P in their tissues and dramatically intensify benthic P exchanges. Mass balance analysis reveals a previously unrecognized sensitivity of the Great Lakes ecosystem, where P availability is now regulated by the dynamics of mussel populations while the role of the external inputs of phosphorus is suppressed. Our results show that a single invasive species can have dramatic consequences for geochemical cycles even in the world's largest aquatic ecosystems. The ongoing spread of dreissenids across a multitude of lakes in North America and Europe is likely to affect carbon and nutrient cycling in these systems for many decades, with important implications for water quality management.


Asunto(s)
Ecosistema , Agua Dulce , Especies Introducidas , Fósforo/metabolismo , Animales , Bivalvos/metabolismo , Monitoreo del Ambiente , Modelos Biológicos , Factores de Tiempo
10.
Sci China Life Sci ; 63(12): 1860-1878, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-33051704

RESUMEN

In recent years, deep learning has been widely used in diverse fields of research, such as speech recognition, image classification, autonomous driving and natural language processing. Deep learning has showcased dramatically improved performance in complex classification and regression problems, where the intricate structure in the high-dimensional data is difficult to discover using conventional machine learning algorithms. In biology, applications of deep learning are gaining increasing popularity in predicting the structure and function of genomic elements, such as promoters, enhancers, or gene expression levels. In this review paper, we described the basic concepts in machine learning and artificial neural network, followed by elaboration on the workflow of using convolutional neural network in genomics. Then we provided a concise introduction of deep learning applications in genomics and synthetic biology at the levels of DNA, RNA and protein. Finally, we discussed the current challenges and future perspectives of deep learning in genomics.


Asunto(s)
Aprendizaje Profundo , Genómica , Algoritmos , Animales , ADN/química , ADN/genética , Humanos , Aprendizaje Automático , Redes Neurales de la Computación , Proteínas/química , Proteínas/metabolismo , ARN/química , ARN/genética
11.
Sci Rep ; 9(1): 19563, 2019 12 20.
Artículo en Inglés | MEDLINE | ID: mdl-31862973

RESUMEN

Phytoplankton can accumulate polyphosphate (polyP) to alleviate limitation of essential nutrient phosphorus (P). Yet polyP metabolisms in aquatic systems and their roles in P biogeochemical cycle remain elusive. Previously reported polyP enrichment in low-phosphorus oligotrophic marine waters contradicts the common view of polyP as a luxury P-storage molecule. Here, we show that in a P-rich eutrophic bay of Lake Ontario, planktonic polyP is controlled by multiple mechanisms and responds strongly to seasonal variations. Plankton accumulate polyP as P storage under high-P conditions via luxury uptake and use it under acute P stress. Low phosphorus also triggers enrichment of polyP that can be preferentially recycled to attenuate P lost. We discover that picoplankton, despite their low production rates, are responsible for the dynamic polyP metabolisms. Picoplankton store and liberate polyP to support the high primary productivity of blooming algae. PolyP mechanisms enable efficient P recycling on ecosystem and even larger scales.

12.
Plant Physiol ; 180(2): 783-792, 2019 06.
Artículo en Inglés | MEDLINE | ID: mdl-30886114

RESUMEN

The oxygenation of ribulose 1,5-bisphosphate by Rubisco is the first step in photorespiration and reduces the efficiency of photosynthesis in C3 plants. Our recent data indicate that mutants in photorespiration have increased rates of photosynthetic cyclic electron flow around photosystem I. We investigated mutant lines lacking peroxisomal hydroxypyruvate reductase to determine if there are connections between 2-phosphoglycolate accumulation and cyclic electron flow in Arabidopsis (Arabidopsis thaliana). We found that 2-phosphoglycolate is a competitive inhibitor of triose phosphate isomerase, an enzyme in the Calvin-Benson cycle that converts glyceraldehyde 3-phosphate to dihydroxyacetone phosphate. This block in metabolism could be overcome if glyceraldehyde 3-phosphate is exported to the cytosol, where cytosolic triose phosphate isomerase could convert it to dihydroxyacetone phosphate. We found evidence that carbon is reimported as glucose-6-phosphate, forming a cytosolic bypass around the block of stromal triose phosphate isomerase. However, this also stimulates a glucose-6-phosphate shunt, which consumes ATP, which can be compensated by higher rates of cyclic electron flow.


Asunto(s)
Citosol/metabolismo , Glucosa-6-Fosfato/metabolismo , Hidroxipiruvato Reductasa/metabolismo , Peroxisomas/enzimología , Arabidopsis/enzimología , Arabidopsis/genética , Arabidopsis/crecimiento & desarrollo , Proteínas de Arabidopsis/metabolismo , Carbono/metabolismo , Dióxido de Carbono/metabolismo , Carotenoides/metabolismo , Clorofila/metabolismo , Dihidroxiacetona Fosfato/metabolismo , Transporte de Electrón , Regulación de la Expresión Génica de las Plantas , Genes de Plantas , Gliceraldehído 3-Fosfato/metabolismo , Glicolatos , Cinética , Modelos Biológicos , Mutación/genética , ARN Mensajero/genética , ARN Mensajero/metabolismo , Ribulosa-Bifosfato Carboxilasa/metabolismo , Triosa-Fosfato Isomerasa/metabolismo
13.
Plant J ; 97(3): 460-474, 2019 02.
Artículo en Inglés | MEDLINE | ID: mdl-30350901

RESUMEN

Plant peroxisomes function collaboratively with other subcellular organelles, such as chloroplasts and mitochondria, in several metabolic processes. To comprehensively investigate the impact of peroxisomal function on photosynthesis, especially under conditions that are more relevant to natural environments, a systematic screen of over 150 Arabidopsis mutants of genes encoding peroxisomal proteins was conducted using the automated Dynamic Environment Photosynthesis Imager (DEPI). Dynamic and high-light (HL) conditions triggered significant photosynthetic defects in a subset of the mutants, including those of photorespiration (PR) and other peroxisomal processes, some of which may also be related to PR. Further analysis of the PR mutants revealed activation of cyclic electron flow (CEF) around photosystem I and higher accumulation of hydrogen peroxide (H2 O2 ) under HL conditions. We hypothesize that impaired PR disturbs the balance of ATP and NADPH, leading to the accumulation of H2 O2 that activates CEF to produce ATP to compensate for the imbalance of reducing equivalents. The identification of peroxisomal mutants involved in PR and other peroxisomal functions in the photometric screen will enable further investigation of regulatory links between photosynthesis and PR and interorganellar interaction at the mechanistic level.


Asunto(s)
Arabidopsis/genética , Peroxisomas/metabolismo , Fotosíntesis/efectos de la radiación , Complejo de Proteína del Fotosistema I/metabolismo , Arabidopsis/fisiología , Arabidopsis/efectos de la radiación , Proteínas de Arabidopsis/genética , Proteínas de Arabidopsis/metabolismo , Cloroplastos/metabolismo , Transporte de Electrón , Peróxido de Hidrógeno/metabolismo , Luz , Redes y Vías Metabólicas , Mitocondrias/metabolismo , Mutación , Oxígeno/metabolismo , Plantas Modificadas Genéticamente
14.
Environ Microbiol ; 21(2): 572-583, 2019 02.
Artículo en Inglés | MEDLINE | ID: mdl-30474918

RESUMEN

Despite the crucial role of polyphosphate (polyP) in aquatic environments, its metabolism in cyanobacteria responding to nutrients is poorly understood. We investigate polyP in three cyanobacteria species, specifically unicellular picocyanobacteria, under various nutritional conditions. Our experiments show that the accumulation of polyP in cyanobacteria is strongly dynamic, depending on phosphate levels and growth stages. 'Overplus' uptake of phosphorus (P) during the lag phase leads to the rapid accumulation of polyP, followed by lower polyP quotas during the exponential growth stage as a result of competing 'luxury' P uptake and polyP utilization to support rapid cell division. Cyanobacteria are capable of P deficiency responses that preferentially maintain polyP. However, preferential utilization of polyP occurs under severe P stress, suggesting the crucial role of polyP as P reserve to support cellular survival. Strong variability was observed among different species of cyanobacteria in their ability to accumulate polyP, and likely in the threshold P levels at which preferential polyP degradation occurs. This suggests that some cyanobacteria may be more adaptive to P-stressed or P-fluctuating conditions. Our results explain and provide important insights into the variability of polyP observed in aquatic environments where picocyanobacteria are the dominant primary producers.


Asunto(s)
Cianobacterias/metabolismo , Polifosfatos/metabolismo , Fosfatasa Alcalina/metabolismo , Fósforo/metabolismo
15.
Sci Rep ; 7(1): 13757, 2017 10 23.
Artículo en Inglés | MEDLINE | ID: mdl-29061974

RESUMEN

Anaerobic ammonium oxidizing (anammox) bacteria own a central position in the global N-cycle, as they have the ability to oxidize NH4+ to N2 under anoxic conditions using NO2-. They are responsible for up to 50% of all N2 released from marine ecosystems into the atmosphere and are thus indispensible for balancing the activity of N-fixing bacteria and completing the marine N-cycle. The contribution, diversity, and impact of anammox bacteria in freshwater ecosystems, however, is largely unknown, confounding assessments of their role in the global N-cycle. Here we report the activity and diversity of anammox bacteria in the world's largest freshwater lake-Lake Superior. We found that anammox performed by previously undiscovered bacteria is an important contributor to sediment N2 production. We observed striking differences in the anammox bacterial populations found at different locations within Lake Superior and those described from other locations. Our data thus reveal that novel anammox bacteria underpin N-loss from Lake Superior, and if more broadly distributed across inland waters would play an important role in continental N-cycling and mitigation of fixed nitrogen transfer from land to the sea.


Asunto(s)
Compuestos de Amonio/metabolismo , Bacterias Anaerobias/metabolismo , Biodiversidad , Sedimentos Geológicos/microbiología , Nitrógeno/metabolismo , Anaerobiosis , Bacterias Anaerobias/crecimiento & desarrollo , Ecosistema , Ciclo del Nitrógeno , Oxidación-Reducción , Filogenia
16.
PLoS One ; 10(9): e0137762, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-26368942

RESUMEN

Peroxisomes are essential organelles that house a wide array of metabolic reactions important for plant growth and development. However, our knowledge regarding the role of peroxisomal proteins in various biological processes, including plant stress response, is still incomplete. Recent proteomic studies of plant peroxisomes significantly increased the number of known peroxisomal proteins and greatly facilitated the study of peroxisomes at the systems level. The objectives of this study were to determine whether genes that encode peroxisomal proteins with related functions are co-expressed in Arabidopsis and identify peroxisomal proteins involved in stress response using in silico analysis and mutant screens. Using microarray data from online databases, we performed hierarchical clustering analysis to generate a comprehensive view of transcript level changes for Arabidopsis peroxisomal genes during development and under abiotic and biotic stress conditions. Many genes involved in the same metabolic pathways exhibited co-expression, some genes known to be involved in stress response are regulated by the corresponding stress conditions, and function of some peroxisomal proteins could be predicted based on their co-expression pattern. Since drought caused expression changes to the highest number of genes that encode peroxisomal proteins, we subjected a subset of Arabidopsis peroxisomal mutants to a drought stress assay. Mutants of the LON2 protease and the photorespiratory enzyme hydroxypyruvate reductase 1 (HPR1) showed enhanced susceptibility to drought, suggesting the involvement of peroxisomal quality control and photorespiration in drought resistance. Our study provided a global view of how genes that encode peroxisomal proteins respond to developmental and environmental cues and began to reveal additional peroxisomal proteins involved in stress response, thus opening up new avenues to investigate the role of peroxisomes in plant adaptation to environmental stresses.


Asunto(s)
Proteasas ATP-Dependientes/genética , Proteínas de Arabidopsis/genética , Arabidopsis/crecimiento & desarrollo , Perfilación de la Expresión Génica/métodos , Mutación , Peroxisomas/metabolismo , Proteasas ATP-Dependientes/metabolismo , Arabidopsis/genética , Arabidopsis/metabolismo , Proteínas de Arabidopsis/metabolismo , Simulación por Computador , Sequías , Regulación del Desarrollo de la Expresión Génica , Regulación de la Expresión Génica de las Plantas , Análisis de Secuencia por Matrices de Oligonucleótidos
17.
Plant Physiol ; 163(4): 1518-38, 2013 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-24130194

RESUMEN

Plant peroxisomes are highly dynamic organelles that mediate a suite of metabolic processes crucial to development. Peroxisomes in seeds/dark-grown seedlings and in photosynthetic tissues constitute two major subtypes of plant peroxisomes, which had been postulated to contain distinct primary biochemical properties. Multiple in-depth proteomic analyses had been performed on leaf peroxisomes, yet the major makeup of peroxisomes in seeds or dark-grown seedlings remained unclear. To compare the metabolic pathways of the two dominant plant peroxisomal subtypes and discover new peroxisomal proteins that function specifically during seed germination, we performed proteomic analysis of peroxisomes from etiolated Arabidopsis (Arabidopsis thaliana) seedlings. The detection of 77 peroxisomal proteins allowed us to perform comparative analysis with the peroxisomal proteome of green leaves, which revealed a large overlap between these two primary peroxisomal variants. Subcellular targeting analysis by fluorescence microscopy validated around 10 new peroxisomal proteins in Arabidopsis. Mutant analysis suggested the role of the cysteine protease RESPONSE TO DROUGHT21A-LIKE1 in ß-oxidation, seed germination, and growth. This work provides a much-needed road map of a major type of plant peroxisome and has established a basis for future investigations of peroxisomal proteolytic processes to understand their roles in development and in plant interaction with the environment.


Asunto(s)
Arabidopsis/enzimología , Arabidopsis/crecimiento & desarrollo , Proteasas de Cisteína/metabolismo , Etiolado , Peroxisomas/enzimología , Proteoma/metabolismo , Plantones/metabolismo , Secuencia de Aminoácidos , Arabidopsis/metabolismo , Proteínas de Arabidopsis/química , Proteínas de Arabidopsis/metabolismo , Cromatografía Liquida , Análisis Mutacional de ADN , ADN Bacteriano/genética , Electroforesis en Gel de Poliacrilamida , Perfilación de la Expresión Génica , Regulación de la Expresión Génica de las Plantas , Redes y Vías Metabólicas , Microscopía Fluorescente , Datos de Secuencia Molecular , Mutación/genética , Oxidación-Reducción , Peroxisomas/metabolismo , Proteómica , Reproducibilidad de los Resultados , Plantones/genética , Alineación de Secuencia , Fracciones Subcelulares/metabolismo , Espectrometría de Masas en Tándem
18.
Zhongguo Zhong Xi Yi Jie He Za Zhi ; 33(5): 646-50, 2013 May.
Artículo en Chino | MEDLINE | ID: mdl-23905385

RESUMEN

OBJECTIVE: To evaluate effects of Tongnao Huoluo acupuncture therapy (THAT) on Bcl-2 and Caspase-3 rats with acute cerebral infarction (ACI). METHODS: Totally 264 SD rats were randomly divided into 5 groups, i.e. the THAT group (n =72), the thrombolysis group (n =72), the body acupuncture group (n =72), the ischemia control group (n =24), and the sham-operation group (n =24). Successfully modeled rats were recruited in all groups except the sham-operation group. Rats in the THAT group, the thrombolysis group, and the body acupuncture group were divided into 3 subgroups according to the disease occurrence time, i.e., < or = 1.5 h THAT group, 1.5+ -2 h THAT group, and 2+ -3 h THAT group. The neuroethological scores were assessed at 6, 24, and 72 h after treatment. The expressions of Bcl-2 and Caspase-3 were detected using immunohistochemical staining at 24 and 72 h respectively. RESULTS: In aspect of improving scores of neurological functions: At 6 h after treatment within 2 h after the disease occurrence, the neuroethological scores were lowered more obviously in the thrombolysis group than in the THAT group (P <0.05). There was statistical difference at 24 and 72 h within 2 - 3 h after the,disease occurrence between the THAT group and the thrombolysis group (P <0.05). Compared with before treatment, there was statistical difference at 24 and 72 h within 3 h after the disease occurrence (P <0. 05, P <0.01). In aspect of lowering the expression of Caspase-3 and elevating the expression of Bcl-2: There was statistical difference in lowering the expression of Caspase-3 and elevating the expression of Bcl-2 between the THAT group and the thrombolysis group at 72 h within 2 -3 after the disease occurrence (P <0.05, P < 0.01). CONCLUSION: THAT showed favorable effects in lowering neuroethological scores, lowering expression of Caspase-3, and elevating the expression of Bcl-2 of ACI rats.


Asunto(s)
Terapia por Acupuntura , Caspasa 3/metabolismo , Infarto Cerebral/metabolismo , Infarto Cerebral/terapia , Proteínas Proto-Oncogénicas c-bcl-2/metabolismo , Animales , Masculino , Ratas , Ratas Sprague-Dawley
19.
Subcell Biochem ; 69: 195-211, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-23821150

RESUMEN

In higher plants, light-grown seedlings exhibit photomorphogenesis, a developmental program controlled by a complex web of interactions between photoreceptors, central repressors, and downstream effectors that leads to changes in gene expression and physiological changes. Light induces peroxisomal proliferation through a phytochrome A-mediated pathway, in which the transcription factor HYH activates the peroxisomal proliferation factor gene PEX11b. Microarray analysis revealed that light activates the expression of a number of peroxisomal genes, especially those involved in photorespiration, a process intimately associated with photosynthesis. In contrast, light represses the expression of genes involved in ß-oxidation and the glyoxylate cycle, peroxisomal pathways essential for seedling establishment before photosynthesis begins. Furthermore, the peroxisome is a source of signaling molecules, notably nitric oxide, which promotes photomorphogenesis. Lastly, a gain-of-function mutant of the peroxisomal membrane-tethered RING-type E3 ubiquitin ligase PEX2 partially suppresses the phenotype of the photomorphogenic mutant det1. Possible mechanisms underlying this phenomenon are discussed.


Asunto(s)
Luz , Peroxisomas/efectos de la radiación , Desarrollo de la Planta/efectos de la radiación , Plantones/efectos de la radiación , Transducción de Señal/efectos de la radiación , Regulación de la Expresión Génica de las Plantas/efectos de la radiación , Óxido Nítrico/metabolismo , Peroxisomas/metabolismo , Plantones/crecimiento & desarrollo , Plantones/metabolismo , Ubiquitina-Proteína Ligasas/metabolismo
20.
Zhongguo Zhong Xi Yi Jie He Za Zhi ; 31(1): 28-32, 2011 Jan.
Artículo en Chino | MEDLINE | ID: mdl-21434339

RESUMEN

OBJECTIVE: To evaluate the effect of Tongnao Huoluo Acupuncture (THA) therapy on acute cerebral infarction (ACI). METHODS: Adopting multi-centered, randomized and controlled method, 397 ACI patients from 10 hospitals subjected to the study were treated according to the initiating time (IT) of disease during hospitalization: the 138 patients of stage-1 with IT < or =6 h, were randomly assigned to three groups, treated respectively with THA (Group A), thrombolysis with urokinase (Group B) and Batroxobin (Group C); the 140 patients of stage-2 with IT within 6-48 h, and 119 patients of stage-3 with IT within 48 h-14 d were randomly assigned to three groups, treated respectively with THA (Group D) body acupuncture (Group E), and conventional treatment (Group F). Therapeutic effect was evaluated by NIHSS scores estimated at the day 1, 3, 7, 14, 28 and 90 of treatment, and the Barthel Index (BI) measured at day 14, 28 and 90. RESULTS: Effect in Group A was insignificantly different from that in Group B (P > 0.05), but was different from that in Group C significantly (P < 0.01). At day 90, the percentage of patients with high BI (HBI%, patients with BI >95%) was insignificantly different in Group A vs. B (P > 0.05), but was significantly different in Group A vs. C (P < 0.01). Comparisons between Group D, E and F showed that the therapeutic effect in Group D was equivalent to that in Group E (P < 0.05), but better than that in Group F (P < 0.01), and HBI% in Group D was superior than that in the other two groups (P < 0.01). CONCLUSIONS: THA therapy shows favorable effects in reducing the crippling rate and improving the living capacity of ACI patients.


Asunto(s)
Terapia por Acupuntura/métodos , Infarto Cerebral/terapia , Adulto , Anciano , Femenino , Humanos , Masculino , Persona de Mediana Edad , Resultado del Tratamiento
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