Structural analysis of BNIP3 transmembrane interactions

BNIP3跨膜相互作用的结构分析

• 批准号: 6824826
• 负责人: Kevin R MacKenzie
• 金额: $ 26.01万
• 依托单位: RICE UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-08-01 至 2009-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6824826
• 关键词: BCL2 gene /protein; Caenorhabditis elegans; Drosophilidae; SDS polyacrylamide gel electrophoresis; Saccharomyces cerevisiae; Schizosaccharomyces pombe; analytical ultracentrifugation; apoptosis; cell membrane; hydropathy; membrane proteins; mitochondria; nuclear magnetic resonance spectroscopy; protein binding; protein folding; protein protein interaction; protein sequence; protein structure function; transcription factor; western blottings

DESCRIPTION (provided by applicant): The long range goals of this research are to determine how the transmembrane domain sequences of "BH3-only"apoptotic regulatory proteins result in structural and functional interactions that give rise to programmed cell death. More than a dozen members of the 'BH3-only' subclass of the Bcl-2 superfamily provide cell- and signal-specific inputs to mitochondria-mediated apoptosis in mammals, but the biochemical and structural basis for this control is poorly understood. This project focuses on BNIP3 (Bcl-2/adenovirus E1B 19-kDa protein-interacting protein 3), a "BH3-only" protein that is functionally conserved from C. elegans to man. The transmembrane (TM) domain of BNIP3 is implicated in the pro-apoptotic function of the protein, in homodimerization, and in interactions with the anti-apoptotic protein Bcl-2. This research will determine the sequence specificity and structural basis for these TM domain interactions and will determine how these lateral associations within membranes contribute to the regulation of mitochondria-mediated apoptosis. Elucidating the mechanism of action of these proteins will have implications for our understanding of development, cancer, and neurodegenerative diseases. In the next five years, this proposed research will determine the structural basis for homo- and hetero-oligomerization of the hydrophobic C-terminal transmembrane (TM) domain of the mammalian "BH3-only" protein BNIP3 and its orthologs in C. elegans and D. melanogaster. Saturation mutagenesis experiments will define the sequence requirements for these associations in biological membranes and in detergents, and the structures of BNIP3 homodimers and heteromeric complexes will be determined using solution NMR spectroscopy. Interpretation of the mutagenesis data in the context of structures will elucidate the physical basis for the stability and specificity of protein-protein interactions inside membranes. Measuring the apoptogenic effects of wild type and mutant full-length BNIP3 constructs in vivo will determine the functional role(s) played by TM-TM interactions. The results will reveal fundamental rules of membrane protein folding, stimulate new types of experiments by cell biology researchers, and may identify novel drug targets for prevention of apoptosis-related cell death and organ damage such as hypoxia-induced apoptosis following ischemia.

描述（由申请人提供）：本研究的长期目标是确定“仅bh3”凋亡调节蛋白的跨膜结构域序列如何导致结构和功能相互作用，从而导致程序性细胞死亡。在哺乳动物中，Bcl-2超家族的“仅bh3”亚类中有十多个成员为线粒体介导的细胞凋亡提供细胞和信号特异性输入，但这种控制的生化和结构基础尚不清楚。本项目重点研究BNIP3 (Bcl-2/腺病毒E1B 19-kDa蛋白相互作用蛋白3)，这是一种从秀丽隐杆线虫到人类在功能上保守的“仅bh3”蛋白。BNIP3的跨膜结构域与该蛋白的促凋亡功能、同型二聚化以及与抗凋亡蛋白Bcl-2的相互作用有关。本研究将确定这些TM结构域相互作用的序列特异性和结构基础，并将确定膜内这些横向关联如何促进线粒体介导的细胞凋亡的调节。阐明这些蛋白的作用机制将对我们对发育、癌症和神经退行性疾病的理解产生影响。