Crystal Structure of Human Soluble Adenylate Cyclase Reveals a Distinct, Highly Flexible Allosteric Bicarbonate Binding Pocket
作者:Susanne M. Saalau-Bethell、Valerio Berdini、Anne Cleasby、Miles Congreve、Joseph E. Coyle、Victoria Lock、Christopher W. Murray、M. Alistair O'Brien、Sharna J. Rich、Tracey Sambrook、Mladen Vinkovic、Jeff R. Yon、Harren Jhoti
DOI:10.1002/cmdc.201300480
日期:2014.4
Solubleadenylatecyclases catalyse the synthesis of the second messenger cAMP through the cyclisation of ATP and are the only known enzymes to be directly activated by bicarbonate. Here, we report the first crystalstructure of the human enzyme that reveals a pseudosymmetrical arrangement of two catalytic domains to produce a single competent active site and a novel discrete bicarbonatebinding pocket
可溶性腺苷酸环化酶通过 ATP 的环化催化第二信使 cAMP 的合成,并且是唯一已知的被碳酸氢盐直接激活的酶。在这里,我们报告了人类酶的第一个晶体结构,它揭示了两个催化域的假对称排列,以产生单个有能力的活性位点和一个新的离散碳酸氢盐结合口袋。apo 蛋白的晶体结构,该蛋白与 α,β-亚甲基腺苷 5'-三磷酸 (AMPCPP) 和钙的复合物,变构激活剂碳酸氢盐,以及使用片段筛选鉴定的许多抑制剂,都显示出灵活的在结合配体时发生显着构象变化的活性位点。