Structure and function of the human mitochondrial MRS2 channel.

ABSTRACT: The human Mitochondrial RNA Splicing 2 protein (MRS2) has been implicated in Mg²⁺ transport across mitochondrial inner membranes, thus playing an important role in Mg²⁺ homeostasis critical for mitochondrial integrity and function. However, the molecular mechanisms underlying its fundamental channel properties such as ion selectivity and regulation remain unclear. Here, we present structural and functional investigation of MRS2. Cryo-electron microscopy structures in various ionic conditions reveal a pentameric channel architecture and the molecular basis of ion permeation and potential regulation mechanisms. Electrophysiological analyses demonstrate that MRS2 is a Ca²⁺-regulated, non-selective channel permeable to Mg²⁺, Ca²⁺, Na⁺

SUBMITTER: He Z 

PROVIDER: S-EPMC10462007 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature