Crystal structure of the cytosolic domain of human MiD51

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.191 

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Structural and functional analysis of MiD51, a dynamin receptor required for mitochondrial fission.

Richter, V.Palmer, C.S.Osellame, L.D.Singh, A.P.Elgass, K.Stroud, D.A.Sesaki, H.Kvansakul, M.Ryan, M.T.

(2014) J Cell Biol 204: 477-486

  • DOI: https://doi.org/10.1083/jcb.201311014
  • Primary Citation of Related Structures:  
    4NXT, 4NXU, 4NXV, 4NXW, 4NXX

  • PubMed Abstract: 

    Mitochondrial fission is important for organelle transport, inheritance, and turnover, and alterations in fission are seen in neurological disease. In mammals, mitochondrial fission is executed by dynamin-related protein 1 (Drp1), a cytosolic guanosine triphosphatase that polymerizes and constricts the organelle. Recruitment of Drp1 to mitochondria involves receptors including Mff, MiD49, and MiD51. MiD49/51 form foci at mitochondrial constriction sites and coassemble with Drp1 to drive fission. Here, we solved the crystal structure of the cytosolic domain of human MiD51, which adopts a nucleotidyltransferase fold. Although MiD51 lacks catalytic residues for transferase activity, it specifically binds guanosine diphosphate and adenosine diphosphate. MiD51 mutants unable to bind nucleotides were still able to recruit Drp1. Disruption of an additional region in MiD51 that is not part of the nucleotidyltransferase fold blocked Drp1 recruitment and assembly of MiD51 into foci. MiD51 foci are also dependent on the presence of Drp1, and after scission they are distributed to daughter organelles, supporting the involvement of MiD51 in the fission apparatus.

  • Organizational Affiliation

    Department of Biochemistry and 2 Australian Research Council Centre of Excellence in Coherent X-Ray Science, La Trobe Institute for Molecular Science, La Trobe University, Melbourne 3086, Australia.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mitochondrial dynamic protein MID51
A, B, C, D
347Homo sapiensMutation(s): 0 
Gene Names: candidate 7-likeMID51MIEF1SMCR7LSmith-Magenis syndrome chromosome region
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NQG6 (Homo sapiens)
Explore Q9NQG6 
Go to UniProtKB:  Q9NQG6
GTEx:  ENSG00000100335 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9NQG6
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on GDP

Download Ideal Coordinates CCD File 
E [auth A],
G [auth B],
K [auth C],
M [auth D]
C10 H15 N5 O11 P2
Query on SO4

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F [auth A],
H [auth B],
I [auth B],
J [auth B]
O4 S
Query on GOL

Download Ideal Coordinates CCD File 
C3 H8 O3
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.191 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.343α = 65.81
b = 79.093β = 84.36
c = 80.052γ = 64.08
Software Package:
Software NamePurpose
ADSCdata collection
PHENIXmodel building
XDSdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-12-25
    Type: Initial release
  • Version 1.1: 2014-03-19
    Changes: Database references
  • Version 1.2: 2024-02-28
    Changes: Data collection, Database references, Derived calculations