National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM141871
米国
引用
ジャーナル: Nature / 年: 2024 タイトル: Promiscuous G-protein activation by the calcium-sensing receptor. 著者: Hao Zuo / Jinseo Park / Aurel Frangaj / Jianxiang Ye / Guanqi Lu / Jamie J Manning / Wesley B Asher / Zhengyuan Lu / Guo-Bin Hu / Liguo Wang / Joshua Mendez / Edward Eng / Zhening Zhang / Xin ...著者: Hao Zuo / Jinseo Park / Aurel Frangaj / Jianxiang Ye / Guanqi Lu / Jamie J Manning / Wesley B Asher / Zhengyuan Lu / Guo-Bin Hu / Liguo Wang / Joshua Mendez / Edward Eng / Zhening Zhang / Xin Lin / Robert Grassucci / Wayne A Hendrickson / Oliver B Clarke / Jonathan A Javitch / Arthur D Conigrave / Qing R Fan / 要旨: The human calcium-sensing receptor (CaSR) detects fluctuations in the extracellular Ca concentration and maintains Ca homeostasis. It also mediates diverse cellular processes not associated with Ca ...The human calcium-sensing receptor (CaSR) detects fluctuations in the extracellular Ca concentration and maintains Ca homeostasis. It also mediates diverse cellular processes not associated with Ca balance. The functional pleiotropy of CaSR arises in part from its ability to signal through several G-protein subtypes. We determined structures of CaSR in complex with G proteins from three different subfamilies: G, G and G. We found that the homodimeric CaSR of each complex couples to a single G protein through a common mode. This involves the C-terminal helix of each Gα subunit binding to a shallow pocket that is formed in one CaSR subunit by all three intracellular loops (ICL1-ICL3), an extended transmembrane helix 3 and an ordered C-terminal region. G-protein binding expands the transmembrane dimer interface, which is further stabilized by phospholipid. The restraint imposed by the receptor dimer, in combination with ICL2, enables G-protein activation by facilitating conformational transition of Gα. We identified a single Gα residue that determines G and G versus G selectivity. The length and flexibility of ICL2 allows CaSR to bind all three Gα subtypes, thereby conferring capacity for promiscuous G-protein coupling.
名称: Human CaSR in complex with Gi3 protein / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: #1-#4
由来(天然)
生物種: Homo sapiens (ヒト)
分子量
理論値: 288 KDa
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分子 #1: Isoform 1 of Extracellular calcium-sensing receptor
分子
名称: Isoform 1 of Extracellular calcium-sensing receptor / タイプ: protein_or_peptide / ID: 1 詳細: The CaSR construct consists of residues 1-903 and a Flag tag inserted after the signal peptide. コピー数: 2 / 光学異性体: LEVO
UniProtKB: Guanine nucleotide-binding protein G(i) subunit alpha-3
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分子 #3: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-2
分子
名称: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-2 タイプ: protein_or_peptide / ID: 3 詳細: GNB2 has N-terminal Flag tag inserted after the initial Met. コピー数: 1 / 光学異性体: LEVO