STIM1 Gates TRPC Channels, but Not Orai1, by Electrostatic Interaction

Overview

Journal Mol Cell

Publisher Cell Press

Specialty Cell Biology

Date 2008 Nov 11

PMID 18995841

Citations 145

Authors

Weizhong Zeng

Joseph P Yuan

Min Seuk Kim

Young Jin Choi

Guo N Huang

Paul F Worley

Shmuel Muallem

Affiliations

Soon will be listed here.

Abstract

The receptor-evoked Ca(2+) signal includes activation of the store-operated channels (SOCs) TRPCs and the Orais. Although both are gated by STIM1, it is not known how STIM1 gates the channels and whether STIM1 gates the TRPCs and Orais by the same mechanism. Here, we report the molecular mechanism by which STIM1 gates TRPC1, which involves interaction between two conserved, negatively charged aspartates in TRPC1((639)DD(640)) with the positively charged STIM1((684)KK(685)) in STIM1 polybasic domain. Charge swapping and functional analysis revealed that exact orientation of the charges on TRPC1 and STIM1 are required, but all positive-negative charge combinations on TRPC1 and STIM1, except STIM1((684)EE(685))+TRPC1((639)RR(640)), are functional as long as they are reciprocal, indicating that STIM1 gates TRPC1 by intermolecular electrostatic interaction. Similar gating was observed with TRPC3((697)DD(698)). STIM1 gates Orai1 by a different mechanism since the polybasic and S/P domains of STIM1 are not required for activation of Orai1 by STIM1.

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