MOLECULAR MECHANISMS OF GUANYLATE CYCLASE ACTIVATION

鸟苷酸环化酶激活的分子机制

• 批准号: 6183755
• 负责人: CHUNG-HO CHANG
• 金额: $ 19.31万
• 依托单位: CASE WESTERN RESERVE UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-01 至 2002-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6183755
• 关键词: active sites; adenosine triphosphate; allosteric site; atrial natriuretic peptide; conformation; enzyme activity; enzyme inhibitors; enzyme mechanism; enzyme structure; enzyme substrate complex; guanylate cyclase; protein structure function; site directed mutagenesis; transfection

DESCRIPTION: (Adapted from the Applicant's Abstract) This is a revised proposal to investigate the involvement of a protein called the guanylate cyclase regulatory protein (GCRP) in the regulation of ANF-stimulated guanylate cyclase activity. This protein which was recently cloned and expressed in the applicant's laboratory has been shown to amplify ANF-dependent cyclase activity in cotransfection experiments. The applicant hypothesizes that; (1) guanylate cyclase exists in an active and inactive form and that the presence of ANF and ATP promotes the development of the former; (2) the inactive form is suppressed by an autoinhibitory site present in the kinase-like domain of the cyclase and (3) in the presence of ANF and ATP, GCRP, and/or its splice variant GCRP-2, associates with the cyclase and induces a conformational change which releases the inhibitory constraint imposed on the active site. To evaluate this hypothesis the applicant proposes to: (1) locate the autoinhibitory site on the guanylate cyclase molecule using site-directed mutagenesis and to determine whether ANF and ATP activate the cyclase by releasing the inhibitory constraint, (2) investigate whether ANF induces the association of GCRP and GCRP-2 with guanylate cyclase and (3) examine whether limited proteolysis or binding at the autoinhibitory site induces a conformational change at the active site of the cyclase.

描述：（改编自申请人摘要）这是一个修订