STRUCTURAL BASIS OF AMINORABINOSE BIOSYNTHESIS LINKED TO POLYMYXIN RESISTANCE

项目摘要/摘要 本申请中概述的研究方案由两个组件组成，旨在促进 首席调查员(PI)向独立研究职业的过渡、职业发展计划和 研究计划。私家侦探具有多学科背景，并通过这项提议，寻求最终确定他的 膜蛋白结构生物学培训。职业发展计划包括结构化的 头两年的教育经验(K99阶段)，包括电子培训 用于膜蛋白研究的显微镜和电子顺磁共振(EPR)光谱 以及提高职业技能，例如撰写补助金、实验室管理、教学和负责任 进行研究。它包括明确和可行的计划，以确定并成功竞争 独立终身教职-在K99阶段结束时跟踪教师职位。私家侦探已经组建了多个 由导师、顾问和合作者组成的纪律团队将监督和指导他的培训、研究 计划和向独立的过渡。该研究计划既包括被导师(K99)，也包括独立人士 (R00)奖项的阶段。它涉及到氨基阿拉伯糖生物合成途径的机制研究。 在与多粘菌素类抗生素耐药有关的革兰氏阴性细菌中，我们的最后一道防线 对抗多重耐药感染。K99阶段的研究计划旨在以知识为基础 从猪最近在氨基阿拉伯糖途径中命名为Arnt的一种酶的溶液结构中获得 和他的同事们。然后，独立(R00)研究计划旨在将结构研究扩展到 氨基阿拉伯糖途径的其他跨膜酶，作用于完整的结构 该途径的描述和功能表征。该研究计划旨在解决的核心问题 要解决的是：(1)酶如何在其上下文中调节其两种脂类底物 折叠？(2)赋予ARNT某些成员立体特异性的分子决定因素是什么？ 酶家族而不是其他？(3)Arnt酶在底物结合和催化过程中如何变化？ (4)途径中的其他跨膜酶看起来如何？它们是如何完成它们的 功能？(5)途径中的其他跨膜酶如何调节脂糖载体？ 十一碳烯基磷酸盐？为了解决这些问题，国际和平研究所制定了一项全面的研究计划 它使用了最先进的方法。此外，该计划还包括一些旨在 在研究计划的背景下扩展电子显微镜的能力， 项目完成后，可能适用于其他研究项目。建议的研究 K99阶段将主要在哥伦比亚大学的突出环境中进行，哥伦比亚大学拥有一个充满活力的 结构生物界。这种环境肯定会促进PI成功地完成 他提出了研究计划，并实现了过渡到独立研究生涯的目标。

Project Summary/Abstract The research proposal outlined in this application is consisted of two components designed to facilitate the transition of the principal investigator (PI) to an independent research career, a career development plan and a research plan. The PI has a multidisciplinary background, and through this proposal, seeks to finalize his training in Structural Biology of Membrane Proteins. The career development plan comprises a structured educational experience for the first two years of the award (K99 phase) that includes training in Electron Microscopy and Electron Paramagnetic Resonance (EPR) Spectroscopy for the study of Membrane Proteins, and enhancement of career skills, such as grant writing, laboratory management, teaching and responsible conduct of research. It includes a clear and actionable plan for identifying and successfully competing for an independent tenure-track faculty position by the end of the K99 phase. The PI has assembled a multi- disciplinary team of mentors, advisors and collaborators that will oversee and guide his training, research program and transition to independence. The research plan spans both the mentored (K99) and independent (R00) phases of the award. It involves mechanistic studies of the aminoarabinose sugar biosynthetic pathway in Gram-negative bacteria that is linked to resistance to polymyxin-class antibiotics, our last line of defense against multi-drug resistant infections. The research program for the K99 phase aims to build on knowledge gained from a recent solution structure of an enzyme in the aminoarabinose pathway, named ArnT, by the PI and his colleagues. The independent (R00) research program then aims to extend the structural studies to other transmembrane enzymes of the aminoarabinose pathway, working towards a complete structural description and functional characterization of the pathway. The core questions that the research program aims to address are: (1) How does the enzyme ArnT accommodate its two lipidic substrates within the context of its fold? (2) What are the molecular determinants that impart stereospecificity to some members of the ArnT enzyme family but not others? (3) How is the ArnT enzyme changing during substrate binding and catalysis? (4) How do the other transmembrane enzymes in the pathway look and how do they accomplish their functions? (5) How do other transmembrane enzymes in the pathway accommodate the lipidic sugar carrier undecaprenyl phosphate? To address these questions, the PI has put together a comprehensive research plan that utilizes state-of-the-art methodologies. Moreover, the plan includes some technology development aimed at extending the capabilities of electron microscopy within the context of the research program, and which, upon completion of the program, may be applicable to other research programs. The proposed studies for the K99 phase will largely take place in the prominent environment of Columbia University, which harbors a vibrant structural biology community. This environment is certain to facilitate the PI in the successful completion of the proposed research program and achieving his goal of transitioning into an independent research career.