8IP3

Cryo-EM structure of hMRS2-Mg


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Molecular basis of Mg 2+ permeation through the human mitochondrial Mrs2 channel.

Li, M.Li, Y.Lu, Y.Li, J.Lu, X.Ren, Y.Wen, T.Wang, Y.Chang, S.Zhang, X.Yang, X.Shen, Y.

(2023) Nat Commun 14: 4713-4713

  • DOI: https://doi.org/10.1038/s41467-023-40516-2
  • Primary Citation of Related Structures:  
    8IP3, 8IP4, 8IP5, 8IP6

  • PubMed Abstract: 

    Mitochondrial RNA splicing 2 (Mrs2), a eukaryotic CorA ortholog, enables Mg 2+ to permeate the inner mitochondrial membrane and plays an important role in mitochondrial metabolic function. However, the mechanism by which Mrs2 permeates Mg 2+ remains unclear. Here, we report four cryo-electron microscopy (cryo-EM) reconstructions of Homo sapiens Mrs2 (hMrs2) under various conditions. All of these hMrs2 structures form symmetrical pentamers with very similar pentamer and protomer conformations. A special structural feature of Cl - -bound R-ring, which consists of five Arg332 residues, was found in the hMrs2 structure. Molecular dynamics simulations and mitochondrial Mg 2+ uptake assays show that the R-ring may function as a charge repulsion barrier, and Cl - may function as a ferry to jointly gate Mg 2+ permeation in hMrs2. In addition, the membrane potential is likely to be the driving force for Mg 2+ permeation. Our results provide insights into the channel assembly and Mg 2+ permeation of hMrs2.


  • Organizational Affiliation

    State Key Laboratory of Medicinal Chemical Biology and Frontiers Science Center for Cell Responses, College of Life Sciences, Nankai University, Tianjin, 300350, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Magnesium transporter MRS2 homolog, mitochondrial
A, B, C, D, E
453Homo sapiensMutation(s): 0 
Gene Names: MRS2HPTMRS2L
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9HD23 (Homo sapiens)
Explore Q9HD23 
Go to UniProtKB:  Q9HD23
PHAROS:  Q9HD23
GTEx:  ENSG00000124532 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HD23
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download Ideal Coordinates CCD File 
F [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG
Query on MG

Download Ideal Coordinates CCD File 
G [auth A]
H [auth A]
I [auth A]
J [auth B]
K [auth B]
G [auth A],
H [auth A],
I [auth A],
J [auth B],
K [auth B],
L [auth B],
M [auth C],
N [auth C],
O [auth D],
P [auth D],
Q [auth E],
R [auth E]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC3.2

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China--

Revision History  (Full details and data files)

  • Version 1.0: 2023-06-14
    Type: Initial release
  • Version 1.1: 2023-08-30
    Changes: Data collection, Database references