Membranes and metabolism: insights from invertebrates and lower vertebrates

膜和新陈代谢：来自无脊椎动物和低等脊椎动物的见解

• 批准号: 92888-2011
• 负责人: Ballantyne, James
• 金额: $ 2.26万
• 依托单位: University of Guelph
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=475219
• 关键词: Membranes; metabolism; insights; invertebrates; lower

The proposed research uses animal models to establish how membrane/protein interactions are involved in the compartmentation and regulation of metabolism. An important aspect of my scientific approach is to attempt to relate several levels of organization (whole animal, tissues, cells, organelles and molecules) with the broad goal of establishing how membranes and their embedded proteins are designed to connect these levels of organization. I have three areas of emphasis Two involve membranes and their associated proteins. For these we will focus on two membrane proteins of enormous importance to all animal cells (Na/K ATPase (NKA) and cytochrome c oxidase (CCO)). NKA is an ATP-consuming ion pump that has been estimated to account for about 25% of the energy needs (ATP) of a typical cell while CCO is part of the ATP producing electron transport chain (ETC) responsible for 85% of aerobic ATP production. These two proteins reside in very different membranes (the cholesterol-free mitochondrial membrane and the cholesterol-rich plasma membrane respectively). These two models thus capture many important elements of the links between membranes and metabolism. The third area of emphasis involves the compartmentation and kinetics of nitrogen metabolism from the whole organism to the cellular and subcellular levels. Taken together the proposed studies will provide a better understanding of the how membrane lipid/protein interactions are involved in mediating the ATP-producing and ATP-consuming processes in cells. At higher levels of organization, they will establish some of the "rules" for the design of exchange of metabolites between the blood and tissues. Our current understanding of these phenomena is rudimentary and thus these studies will be of broad applicability to all multicellular animals.

拟议的研究使用动物模型来确定膜/蛋白质相互作用如何参与代谢的划分和调节。我的科学方法的一个重要方面是尝试将多个层次的组织（整个动物、组织、细胞、细胞器和分子）与建立膜及其嵌入蛋白质如何设计来连接这些组织层次的广泛目标联系起来。我有三个重点领域，其中两个涉及膜及其相关蛋白质。为此，我们将重点关注对所有动物细胞极其重要的两种膜蛋白（Na/K ATP 酶 (NKA) 和细胞色素 c 氧化酶 (CCO)）。 NKA 是一种消耗 ATP 的离子泵，据估计约占典型细胞能量需求 (ATP) 的 25%，而 CCO 是产生 ATP 的电子传递链 (ETC) 的一部分，负责有氧 ATP 生产的 85%。这两种蛋白质驻留在非常不同的膜中（分别是无胆固醇的线粒体膜和富含胆固醇的质膜）。因此，这两个模型捕获了膜与新陈代谢之间联系的许多重要要素。 第三个重点领域涉及从整个生物体到细胞和亚细胞水平的氮代谢的区划和动力学。总而言之，拟议的研究将有助于更好地理解膜脂/蛋白质相互作用如何参与介导细胞中 ATP 产生和 ATP 消耗过程。在更高层次的组织中，他们将为血液和组织之间代谢物交换的设计制定一些“规则”。我们目前对这些现象的理解还很初级，因此这些研究将广泛适用于所有多细胞动物。