The MmpL3 interactome

MmpL3 相互作用组

• 批准号: 10382791
• 负责人: Georgiana E. Purdy
• 金额: $ 19.25万
• 依托单位: OREGON HEALTH & SCIENCE UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-27 至 2023-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10382791
• 关键词: Adaptor Signaling Protein; Anabolism; Antibiotic Resistance; Binding; Biochemical Genetics; Biogenesis; Cause of Death; Cell Wall; Cell division; Cell membrane; Communicable Diseases; Complex; Cord Factors; Cytoplasm; Data; Drug Targeting; Esters; Future; Glycoconjugates; Hydrophobicity; In Vitro; Lipid Binding; Lipids; Lipoproteins; Membrane; Membrane Proteins; Modeling; Modification; Mycobacterium tuberculosis; Mycolic Acid; Nodule; Pathogenesis; Peptidoglycan; Periplasmic Proteins; Phenotype; Physiology; Protein Family; Proteins; Publications; Resistance; Role; Site; Transferase; Trehalose; Triglycerides; Tuberculosis; Virulence; Waxes; Work; arabinogalactan; base; cell envelope; crosslink; genetic approach; in vivo; interest; lipid transport; mutant; mycobacterial; mycolate; protein complex; therapeutic target; tuberculosis drugs

ABSTRACT Tuberculosis is one of the leading causes of death due to infectious disease despite the availability of anti- tubercular drugs. The cell envelope of Mycobacterium tuberculosis (Mtb) is notable for the abundance of mycolic acids (MAs), which are essential to mycobacterial viability. The mycobacterial cell envelope is extremely hydrophobic, contributes to virulence and antibiotic resistance. Yet, exactly how glycoconjugates and other species-specific lipids are transported across the inner membrane for cell envelope biosynthesis is incompletely understood. Recent work shows that the Mycobacterial membrane protein Large (MmpL) transporters export lipids synthesized in the mycobacterial cytoplasm for incorporation into the cell envelope. These transporters are therefore important for bacterial viability and virulence. MmpL3, the focus of this proposal, is essential and required for transport of trehalose monomycolate (TMM), the precursor of trehalose dimycolate (TDM) and mycolyl arabinogalactan peptidoglycan (mAGP). The exact mechanism of MmpL3 export remains elusive. RND family proteins typically possess adaptor proteins that assist in substrate transport. As presented in our preliminary data and recent publication, we identified several lipoproteins that interact with MmpL3 and MmpL11. We characterized an Mtb lpqN mutant and demonstrated that LpqN has a lipid binding pocket and interacts with the Ag85 mycolyl transferases. Based on these data, we propose a model where mycobacterial lipoproteins form a complex with MmpL protein to promote lipid secretion and localization. Our hypothesis is that MmpL3 interacts with lipoproteins that facilitate export of TMM and its incorporation into the cell envelope. The proposed study will combine biochemical and genetic approaches to identify proteins that complex with MmpL3 to facilitate substrate transport. .

抽象的 尽管有抗结核药物可用，但结核病仍是传染病导致死亡的主要原因之一。 结核病药物。结核分枝杆菌 (Mtb) 的细胞包膜以富含 分枝杆菌酸 (MA)，对分枝杆菌的生存能力至关重要。分枝杆菌细胞膜是 极其疏水，有助于毒力和抗生素耐药性。然而，糖复合物到底是如何结合的 和其他物种特异性脂质跨内膜转运以进行细胞被膜生物合成 不完全理解。 最近的研究表明，分枝杆菌膜蛋白大 (MmpL) 转运蛋白输出脂质 在分枝杆菌细胞质中合成并掺入细胞包膜中。这些运输机是 因此对于细菌的活力和毒力很重要。 MmpL3 是本提案的重点，是必不可少的并且 运输海藻糖单霉菌酸酯 (TMM)、海藻糖二霉菌酸酯 (TDM) 的前体和 菌基阿拉伯半乳聚糖肽聚糖（mAGP）。 MmpL3 输出的确切机制仍然难以捉摸。 RND 家族蛋白通常具有协助底物转运的接头蛋白。如中所介绍的 根据我们的初步数据和最近的出版物，我们鉴定了几种与 MmpL3 相互作用的脂蛋白， MmpL11。我们对 Mtb lpqN 突变体进行了表征，并证明 LpqN 具有脂质结合袋，并且 与 Ag85 菌基转移酶相互作用。基于这些数据，我们提出了一个模型，其中分枝杆菌 脂蛋白与MmpL蛋白形成复合物，促进脂质分泌和定位。 我们的假设是 MmpL3 与脂蛋白相互作用，促进 TMM 及其输出 并入细胞膜。拟议的研究将结合生化和遗传学方法 鉴定与 MmpL3 复合以促进底物转运的蛋白质。 。