Structural Characterization of Gbetagamma-Phospholipase C complexes

项目摘要 阿片类药物危机、心血管疾病和癌症是美国最紧迫的医疗危机。 美国的PLCβ酶是正常镇痛、心血管和 增殖性信号传导此外，PLCβ与其G蛋白之间的相互作用被破坏 激活剂已经显示出改善阿片诱导的临床前模型的结果， 镇痛、心脏肥大和癌症。然而，专门针对这些相互作用， 在缺乏结构数据的情况下，几乎不可能告知构象差异 在非活性、活性和G蛋白结合PLCβ状态之间。该项目的目标是 了解PLCβ激活Gβγ和/或膜的机制，通过结构和 功能研究。PLCβ上的Gβγ结合位点尚未确定，总体而言，Gβγ- 效应酶的依赖性调节是一个知之甚少的过程。这个项目就不会 这只会增加我们对PLCβ信号在膜上的整体理解， 与Gβγ，但也将提供对其他酶的调节，在 膜界面这项研究的完成将协同增加我们的理解 PLCβ激活机制，提供可用于开发的见解 探针和最终潜在的治疗剂，靶向G蛋白-PLC β相互作用。

PROJECT SUMMARY The opioid crisis, cardiovascular disease, and cancer are the most pressing healthcare crises in the United States. PLCβ enzymes are essential for normal analgesic, cardiovascular, and proliferative signaling. Further, disruption of interactions between PLCβ and its G protein activators have been shown to improve outcomes in preclinical models of opioid induced analgesia, cardiac hypertrophy, and cancer. However, targeting these interactions specifically is nearly impossible in the absence of structural data that informs on the conformational differences between inactive, active, and G protein bound PLCβ states. The goal of this project is to understand mechanisms of PLCβ activation by Gβγ and/or the membrane through structural and functional studies. The Gβγ binding site on PLCβ has yet to be defined, and overall, Gβγ- dependent regulation of effector enzymes is a poorly understood process. This project would not only increase our overall understanding of PLCβ signaling at the membrane and in conjunction with Gβγ but would also provide insights into the regulation of other enzymes that act at the membrane interface. The completion of this study will synergistically increase our understanding of PLCβ activation mechanisms, providing insights that can be leveraged for the development of probes, and ultimately potential therapeutics, targeting G protein–PLCβ interactions.