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101.
Genome-wide analysis identifies a general requirement for polarity proteins in endocytic traffic 总被引:5,自引:0,他引:5
In a genome-wide RNA-mediated interference screen for genes required in membrane traffic - including endocytic uptake, recycling from endosomes to the plasma membrane, and secretion - we identified 168 candidate endocytosis regulators and 100 candidate secretion regulators. Many of these candidates are highly conserved among metazoans but have not been previously implicated in these processes. Among the positives from the screen, we identified PAR-3, PAR-6, PKC-3 and CDC-42, proteins that are well known for their importance in the generation of embryonic and epithelial-cell polarity. Further analysis showed that endocytic transport in Caenorhabditis elegans coelomocytes and human HeLa cells was also compromised after perturbation of CDC-42/Cdc42 or PAR-6/Par6 function, indicating a general requirement for these proteins in regulating endocytic traffic. Consistent with these results, we found that tagged CDC-42/Cdc42 is enriched on recycling endosomes in C. elegans and mammalian cells, suggesting a direct function in the regulation of transport. 相似文献
102.
Significant levels of circulating immune complexes (ICs) containing rheumatoid factors and immunoglobulin G in peripheral
blood are a characteristic feature of rheumatoid arthritis (RA). ICs interact through Fcγ receptors (FcγR) to activate phagocytes
in numerous inflammatory processes. The high concentration of neutrophils in synovial fluid during active phases of the disease,
together with their destructive capacity, pose important questions as to their role in the pathogenesis of RA. Functional
defects in RA or control peripheral blood neutrophil FcγRs were examined with a specific FcγR-mediated reactive oxygen species
(ROS) assay. Heterologous cross-linking of FcγRIIa and FcγRIIIb on neutrophils resulted in a significantly decreased production
of ROS by RA cells compared with controls matched for age and sex. However, expression and homologous ligation of receptors
did not differ between these groups. These data suggest that neutrophil priming does occur before emigration into the joint
and that blood neutrophils from patients with RA have a functional impairment in cooperative FcγR-mediated ROS generation.
This may account for the increased susceptibility to bacterial infection that arises in patients with severe disease. 相似文献
103.
104.
降解烤烟秸秆和烟碱菌株的筛选及其产酶特性 总被引:1,自引:0,他引:1
摘要:【目的】为获得能够降解烤烟秸秆和烟碱的菌株,并探索其降解烤烟秸秆的利用途径。【方法】以烤烟秸秆为唯一碳氮源,从烟田土壤中进行了菌株的筛选。采用形态学观察、生理生化特性鉴定、16S rRNA基因序列鉴定等方法对该菌株进行了鉴定,并对其以烤烟秸秆为底物进行液态发酵的产酶活性和木质纤维素降解效果进行了测定。【结果】结果表明:该菌株为巨大芽孢杆菌(Bacillus megaterium)。在以烤烟秸秆为主要营养物质液态发酵条件下该菌株具有较强的木质素降解能力,最大漆酶活力达到418.52 U/L,而木质素过氧化物酶和锰过氧化物酶的最大酶活分别为19.71 U/L 和64.71 U/L。此外,发酵20 d后该菌能够完全降解发酵液中的烟碱。【结论】本研究筛选到了1株能够较好降解烤烟秸秆和完全降解烟碱的巨大芽孢杆菌(Bacillus megaterium),且该菌株具有利用烤烟秸秆生产漆酶的应用价值。 相似文献
105.
Leela Krishna Bankapalli Rahul Chandra Mishra Balvinder Singh Saumya Raychaudhuri 《PloS one》2015,10(10)
VopK, a type III effector protein, has been implicated in the pathogenesis of Vibrio cholerae strains belonging to diverse serogroups. Ectopic expression of this protein exhibits strong toxicity in yeast model system. In order to map critical residues in VopK, we scanned the primary sequence guided by available data on various toxins and effector proteins. Our in silico analysis of VopK indicated the presence of predicted MCF1-SHE (SHxxxE) serine peptidase domain at the C-terminus region of the protein. Substitution of each of the predicted catalytic triad residues namely Ser314, His353 and Glu357 with alanine resulted in recombinant VopK proteins varying in lethality as evaluated in yeast model system. We observed that replacement of glutamate357 to alanine causes complete loss in toxicity while substitutions of serine314 and histidine353 with alanine exhibited partial loss in toxicity without affecting the stability of variants. In addition, replacement of another conserved serine residue at position 354 (S354) within predicted S314H353E357 did not affect toxicity of VopK. In essence, combined in silico and site directed mutagenesis, we have identified critical amino acids contributing to the lethal activity of VopK in yeast model system. 相似文献
106.
107.
Angela Cánovas Gonzalo Rincon Alma Islas-Trejo Saumya Wickramasinghe Juan F. Medrano 《Mammalian genome》2010,21(11-12):592-598
108.
Kalpana Bhandari Nagarapu Srinivas Vijay K. Marrapu Aditya Verma Saumya Srivastava Suman Gupta 《Bioorganic & medicinal chemistry letters》2010,20(1):291-293
A series of aryloxy alkyl/aryl alkyl imidazoles were synthesized and evaluated in vitro as antileishmanials against Leishmania donovani. All the 19 compounds exhibited 94–100% inhibition at 10 μg/mL against promastigotes and 12 compounds exhibited high inhibition with an IC50 in the range of 0.47–4.85 μg/mL against amastigotes. Promising compounds were tested further in vivo. Among all, compounds 4 and 23 with 4-CF3 aryloxy moiety exhibited medium in vivo inhibition of 58–60%, thus providing new structural lead for antileishmanials. 相似文献
109.
A novel aerobic bacterium, strain HT23T, able to grow on 500 mM sodium arsenate was isolated from a hot-spring sediment sample collected from Athamallik, Orissa, India. Cells of this isolate were Gram negative. Heterotrophic growth was observed at pH 6.0–11.0 and 20–45 °C. Optimum growth was observed at 37 °C and pH 7.0–10.0. The major polar lipids are diphosphatidyl glycerol, phosphatidyl glycerol, phosphatidyl ethanolamine, phosphatidyl choline and phosphatidyl monomethyl ethanolamine. The major isoprenoid quinone was Q-10. 16S rRNA gene sequence analysis indicated that the bacterium clustered with the genus Pannonibacter and showed 98.9 % similarity with Pannonibacter phragmitetus C6-19T (DSM 14782T) and 98 % with the P. phragmitetus group B and P. phragmitetus group E strains. Levels of DNA–DNA relatedness between the strain HT23T and P. phragmitetus C6-19T (DSM 14782T) and other strains of P. phragmitetus group B and group E strains were below 55 %. On the basis of phenotypic and chemotaxonomic characteristics, 16S rRNA gene sequence analysis and DNA–DNA hybridization data, strain HT23T is considered to represent a novel species of the genus Pannonibacter, for which the name Pannonibacter indica sp. nov. is proposed. The type strain is HT23T (=JCM 16851T = DSM 23407T = LMG 25769T). 相似文献
110.
Nishi Gupta Saumya Sarkar Archana David Pravin Kumar Gangwar Richa Gupta Gita Khanna Satya Narayan Sankhwar Anil Khanna Singh Rajender 《PloS one》2013,8(7)