Structural mechanism of TRPM7 channel regulation by intracellular magnesium.
Structural mechanism of TRPM7 channel regulation by intracellular magnesium.
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DOI:
10.1007/s00018-022-04192-7
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发表时间:
2022-04-07
期刊:
影响因子:
--
通讯作者:
Chubanov V
中科院分区:
文献类型:
--
作者:
Schmidt E;Narangoda C;Nörenberg W;Egawa M;Rössig A;Leonhardt M;Schaefer M;Zierler S;Kurnikova MG;Gudermann T;Chubanov V
Zn2+, Mg2+ and Ca2+ are essential divalent cations implicated in many metabolic processes and signalling pathways. An emerging new paradigm is that the organismal balance of these cations predominantly depends on a common gatekeeper, the channel-kinase TRPM7. Despite extensive electrophysiological studies and recent cryo-EM analysis, an open question is how the channel activity of TRPM7 is activated. Here, we performed site-directed mutagenesis of mouse TRPM7 in conjunction with patch-clamp assessment of whole-cell and single-channel activity and molecular dynamics (MD) simulations to show that the side chains of conserved N1097 form an inter-subunit Mg2+ regulatory site located in the lower channel gate of TRPM7. Our results suggest that intracellular Mg2+ binds to this site and stabilizes the TRPM7 channel in the closed state, whereas the removal of Mg2+ favours the opening of TRPM7. Hence, our study identifies the structural underpinnings through which the TRPM7 channel is controlled by cytosolic Mg2+, representing a new structure–function relationship not yet explored among TRPM channels. The online version contains supplementary material available at 10.1007/s00018-022-04192-7.
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