ジャーナル: EMBO Rep / 年: 2024 タイトル: Regulatory sites of CaM-sensitive adenylyl cyclase AC8 revealed by cryo-EM and structural proteomics. 著者: Basavraj Khanppnavar / Dina Schuster / Pia Lavriha / Federico Uliana / Merve Özel / Ved Mehta / Alexander Leitner / Paola Picotti / Volodymyr M Korkhov / 要旨: Membrane adenylyl cyclase AC8 is regulated by G proteins and calmodulin (CaM), mediating the crosstalk between the cAMP pathway and Ca signalling. Despite the importance of AC8 in physiology, the ...Membrane adenylyl cyclase AC8 is regulated by G proteins and calmodulin (CaM), mediating the crosstalk between the cAMP pathway and Ca signalling. Despite the importance of AC8 in physiology, the structural basis of its regulation by G proteins and CaM is not well defined. Here, we report the 3.5 Å resolution cryo-EM structure of the bovine AC8 bound to the stimulatory Gαs protein in the presence of Ca/CaM. The structure reveals the architecture of the ordered AC8 domains bound to Gαs and the small molecule activator forskolin. The extracellular surface of AC8 features a negatively charged pocket, a potential site for unknown interactors. Despite the well-resolved forskolin density, the captured state of AC8 does not favour tight nucleotide binding. The structural proteomics approaches, limited proteolysis and crosslinking mass spectrometry (LiP-MS and XL-MS), allowed us to identify the contact sites between AC8 and its regulators, CaM, Gαs, and Gβγ, as well as to infer the conformational changes induced by these interactions. Our results provide a framework for understanding the role of flexible regions in the mechanism of AC regulation.
全体 : Focused refinement of soluble domain of Adenylyl cyclase 8 bound ...
全体
名称: Focused refinement of soluble domain of Adenylyl cyclase 8 bound to stimulatory G protein, Forskolin, and MANT-GTP
要素
複合体: Focused refinement of soluble domain of Adenylyl cyclase 8 bound to stimulatory G protein, Forskolin, and MANT-GTP
複合体: Adenylyl cyclase 8
タンパク質・ペプチド: Adenylyl cyclase 8
複合体: G protein alpha S
タンパク質・ペプチド: G protein alpha S
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超分子 #1: Focused refinement of soluble domain of Adenylyl cyclase 8 bound ...
超分子
名称: Focused refinement of soluble domain of Adenylyl cyclase 8 bound to stimulatory G protein, Forskolin, and MANT-GTP タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all