Evaluation Statement (14 June 2024)
The study by He et al. explores the structure and mechanisms of the human mitochondrial RNA splicing 2 (MRS2) protein, predicted to form Mg2+-selective channels in the mitochondrial inner membrane based on homology to the CorA family of prokaryotic Mg2+ channels. The authors use an innovative biochemical strategy to express MRS2 and perform single particle reconstructions in the absence and presence of key divalent cations. High resolution reconstructions of the pentameric channel reveal binding sites for Mg2+ and Ca2+, and electrophysiological investigations suggest that MRS2 is a Ca2+-regulated, cation-selective, Mg2+-permeable channel, in contrast to the Mg2+-regulated, Mg2+-selective CorA channel. This is an important study with interesting structural and functional observations, which will motivate further investigations of a potential role for MRS2 in mitochondrial Ca2+ signaling.
Biophysics Colab recommends this study to scientists interested in the structure, function and regulation of cation channels as well as those working on mitochondrial transport.
Biophysics Colab has evaluated this study as one that meets the following criteria:
- Rigorous methodology
- Transparent reporting
- Appropriate interpretation
(This evaluation refers to the version of record for this work, which is linked to and has been revised from the original preprint following peer review.)