Unraveling the dynamics that enable unusual heme enzyme reactivity

揭示血红素酶异常反应的动力学

• 批准号: 10798604
• 负责人: Katherine Marie Davis
• 金额: $ 8.5万
• 依托单位: EMORY UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2027-08-31
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/10798604
• 关键词: Anabolism; Antibiotics; Behavior; Biological; Biotechnology; Cell Respiration; Communicable Diseases; Development; Disease; Enzymes; Goals; Health; Heme; Human; Hydroxylation; Immune response; Immune system; Life; Medicine; Metals; Methodology; Methods; Outcome; Pathway interactions; Pharmacologic Substance; Process; Production; Reaction; Regulation; Research; Role; Signal Transduction; Site-Directed Mutagenesis; System; Therapeutic; Time; Visualization; X-Ray Crystallography; analog; anti-cancer therapeutic; biochemical tools; cancer therapy; catalyst; cofactor; combat; fascinate; hormone biosynthesis; interest; metalloenzyme; nitration; structural biology

ABSTRACT Enzymes are crucial biological catalysts that expedite challenging reactions across all domains of life. While the development of structural biology methods over the past century has enabled visualization of these fascinating systems, our understanding of the dynamic processes that facilitate enzyme reactivity remains limited due to the timescales on which they occur. The overarching goal in my research group is to develop and apply time-resolved methods capable of visualizing these processes to elucidate the mechanisms of metal-containing enzymes important for human health and medicine. Heme-dependent enzymes are of particular interest due to their role in aerobic metabolism ranging from signal transduction, antibiotic biosynthesis and immune response. Despite sharing similar structural motifs and catalytic intermediates, heme-dependent enzymes are capable of catalyzing a wide range of reactions beyond their archetypal hydroxylation outcomes. This project aims to investigate the structural features and dynamic behavior that enables this atypical reactivity from dioxygenation to nitration and beyond. In particular, we plan to repurpose biochemical tools capable of pausing turnover, such as substrate/cofactor analogs and site-directed mutagenesis, as well as apply state-of-the-art time- resolved methods that my group is currently developing, to visualize short-lived catalytic intermediates via a combination of X-ray crystallographic and spectroscopic approaches. Although applied to specific systems herein, the proposed methodologies may have utility in the study of heme-enzymes more broadly, as well as other metalloenzymes. Likewise, the anticipated results have the potential to impact both biocatalysis and the downstream development of biotechnologies and therapeutics in the treatment of cancers and infectious diseases.

摘要 酶是关键的生物催化剂，可以加速所有领域具有挑战性的反应。 生活的一部分。虽然结构生物学方法在过去一个世纪的发展使 这些引人入胜的系统的可视化，我们对动态过程的理解 由于它们发生的时间尺度，促进酶反应的活性仍然有限。这个 我的研究小组的首要目标是开发和应用时间分辨方法，能够 可视化这些过程以阐明含金属酶的机制很重要 为了人类的健康和医学。依赖于血红素的酶特别令人感兴趣，因为它们 在有氧代谢中的作用，包括信号转导、抗生素生物合成和免疫 回应。尽管有相似的结构基序和催化中间体，但依赖于血红素 酶能够催化超出其原型的一系列反应。 羟化结果。本项目旨在研究其结构特点和动态特性 使这种非典型的反应从双氧化到硝化甚至更远的行为。在……里面 特别是，我们计划重新使用能够暂停周转的生化工具，例如 底物/辅因子类似物和定点突变，以及应用最先进的时间- 我的团队目前正在开发的解决方法，以可视化短暂的催化 通过X射线结晶学和光谱学相结合的方法合成中间体。 虽然适用于本文中的特定系统，但建议的方法可能在 更广泛地研究血红素酶，以及其他金属酶。同样，预期的 结果有可能影响生物催化和下游的发展 治疗癌症和传染病的生物技术和治疗学。