Identification and characterization of factors affecting cytoskeletal proteins--the mediators of bacterial cell shape

影响细胞骨架蛋白的因素的鉴定和表征——细菌细胞形状的介质

• 批准号: 9905535
• 负责人: Sean Murray
• 金额: $ 10.88万
• 依托单位: CALIFORNIA STATE UNIVERSITY NORTHRIDGE
• 依托单位国家: 美国
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-05-01 至 2022-04-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/9905535
• 关键词: Adenylate Cyclase; Affect; Alleles; Animal Model; Bacteria; Caulobacter; Caulobacter crescentus; Cell Shape; Cell Wall; Cell membrane; Cell physiology; Cells; Cellular Morphology; Cellular Structures; Co-Immunoprecipitations; Cytosine; Cytoskeletal Proteins; Cytoskeleton; Data; Enzymes; Fluorescence Microscopy; GPI Membrane Anchors; Gel; Genomic Library; Helicobacter pylori; Human; Intermediate Filament Proteins; Intermediate Filaments; Investigation; Lamin Type A; Link; Literature; Mass Spectrum Analysis; Mediating; Mediator of activation protein; Modeling; Morphology; Muscular Dystrophies; Mutation; Nuclear Lamin; Pathogenesis; Pathogenicity; Phenotype; Phospholipids; Premature aging syndrome; Proteins; Research; Rod; Shapes; Site; Sphingolipids; System; Testing; Vibrio cholerae; base; experimental study; host colonization; human pathogen; mutant; overexpression; prevent; protein protein interaction; tripolyphosphate; vector; yeast two hybrid system

PROJECT SUMMARY In general, mediators of bacterial cell shape via the cytoskeleton are not well understood. We will explore the interplay of the cytoskeleton and cell shape based on three promising observations. First, we have identified a phospholipid synthase (CC1159) that, when overexpressed, causes the bacterium Caulobacter crescentus to change its shape from a crescent to a rod-shaped morphology by inhibiting the localization and function of the intermediate filament protein known as crescentin. Second, overexpression of a catalytically inactive version of the phospholipid synthase still mediates the change in cell shape, suggesting that the phenotype results from a protein-protein interaction instead of elevated levels of a phospholipid. Third, bacterial two-hybrid data suggest that our phospholipid synthase interacts with itself and with cytosine triphosphate synthase (CtpS), which also induces a rod-shaped morphology when overexpressed via interaction with crescentin. Human homologs of crescentin, the intermediate filament nuclear Lamins A/C, are implicated in premature aging and muscular dystrophy, and we suggest a link between phospholipid synthesis and intermediate filaments in C. crescentus that may parallel their human homologs. Research in the eukaryotic literature is just starting to link phospholipids/sphingolipids [and glycosylphosphatidylinositol-anchored proteins (GPI-AP)] with intermediate filaments, suggesting that our investigations in C. crescentus may be relevant to humans. Additionally, Helicobacter pylori's and Vibrio cholerae's crescent shape contributes to host colonization and pathogenesis. Thus, our findings may be also relevant to cell shape and pathogenicity of these human pathogens.

项目概要 一般来说，通过细胞骨架调节细菌细胞形状的介质尚不清楚。我们将探索 基于三个有希望的观察结果，细胞骨架和细胞形状的相互作用。首先，我们确定了一个 磷脂合酶 (CC1159)，当过度表达时，会导致新月柄杆菌 通过抑制其定位和功能，将其形状从新月形变为杆状形态 中间丝蛋白称为新月蛋白。其次，催化失活版本的过度表达 磷脂合酶的作用仍然介导细胞形状的变化，表明表型结果 来自蛋白质-蛋白质相互作用，而不是磷脂水平升高。三、细菌双杂交数据 表明我们的磷脂合酶与其自身以及与胞嘧啶三磷酸合酶（CtpS）相互作用， 当通过与新月蛋白相互作用过度表达时，它也会诱导杆状形态。人类 新月蛋白的同系物，即中间丝核层粘连蛋白 A/C，与过早衰老和 肌营养不良症，我们认为磷脂合成和 C. 中间丝之间存在联系。 新月形动物可能与它们的人类同源物相似。真核文献的研究才刚刚开始联系 磷脂/鞘脂[和糖基磷脂酰肌醇锚定蛋白 (GPI-AP)] 与中间体 细丝，表明我们对 C. crescentus 的研究可能与人类相关。此外， 幽门螺杆菌和霍乱弧菌的新月形状有助于宿主定植和发病机制。 因此，我们的发现可能也与这些人类病原体的细胞形状和致病性有关。