7PV1 image
Entry Detail
PDB ID:
7PV1
Title:
Crystal structure of the dimeric mitofilin domain of Mic60 in complex with the CHCH domain of Mic19
Biological Source:
PDB Version:
Deposition Date:
2021-10-01
Release Date:
2022-09-07
Method Details:
Experimental Method:
Resolution:
2.50 Å
R-Value Free:
0.25
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:MICOS complex subunit MIC60 fused to MIC19
Chain IDs:A, B, C, D
Chain Length:149
Number of Molecules:4
Biological Source:Chaetomium thermophilum (strain DSM 1495 / CBS 144.50 / IMI 039719)
Ligand Molecules
Primary Citation
Structural insights into crista junction formation by the Mic60-Mic19 complex.
Sci Adv 8 eabo4946 eabo4946 (2022)
PMID: 36044574 DOI: 10.1126/sciadv.abo4946

Abstact

Mitochondrial cristae membranes are the oxidative phosphorylation sites in cells. Crista junctions (CJs) form the highly curved neck regions of cristae and are thought to function as selective entry gates into the cristae space. Little is known about how CJs are generated and maintained. We show that the central coiled-coil (CC) domain of the mitochondrial contact site and cristae organizing system subunit Mic60 forms an elongated, bow tie-shaped tetrameric assembly. Mic19 promotes Mic60 tetramerization via a conserved interface between the Mic60 mitofilin and Mic19 CHCH (CC-helix-CC-helix) domains. Dimerization of mitofilin domains exposes a crescent-shaped membrane-binding site with convex curvature tailored to interact with the curved CJ neck. Our study suggests that the Mic60-Mic19 subcomplex traverses CJs as a molecular strut, thereby controlling CJ architecture and function.

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