Crystal structure of the cytosolic domain of mouse MiD51 bound to ADP

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.173 

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The Mitochondrial Fission Receptor MiD51 Requires ADP as a Cofactor.

Loson, O.C.Liu, R.Rome, M.E.Meng, S.Kaiser, J.T.Shan, S.O.Chan, D.C.

(2014) Structure 22: 367-377

  • DOI: https://doi.org/10.1016/j.str.2014.01.001
  • Primary Citation of Related Structures:  
    4OAF, 4OAG, 4OAH, 4OAI

  • PubMed Abstract: 

    Mitochondrial fission requires recruitment of dynamin-related protein 1 (Drp1) to the mitochondrial surface and activation of its GTP-dependent scission function. The Drp1 receptors MiD49 and MiD51 recruit Drp1 to facilitate mitochondrial fission, but their mechanism of action is poorly understood. Using X-ray crystallography, we demonstrate that MiD51 contains a nucleotidyl transferase domain that binds ADP with high affinity. MiD51 recruits Drp1 via a surface loop that functions independently of ADP binding. However, in the absence of nucleotide binding, the recruited Drp1 cannot be activated for fission. Purified MiD51 strongly inhibits Drp1 assembly and GTP hydrolysis in the absence of ADP. Addition of ADP relieves this inhibition and promotes Drp1 assembly into spirals with enhanced GTP hydrolysis. Our results reveal ADP as an essential cofactor for MiD51 during mitochondrial fission.

  • Organizational Affiliation

    Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA; Howard Hughes Medical Institute, California Institute of Technology, Pasadena, CA 91125, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mitochondrial dynamic protein MID51
A, B
335Mus musculusMutation(s): 0 
Gene Names: Mid51MiD51 (aka SMCR7L)Mief1Smcr7l
UniProt & NIH Common Fund Data Resources
Find proteins for Q8BGV8 (Mus musculus)
Explore Q8BGV8 
Go to UniProtKB:  Q8BGV8
IMPC:  MGI:2146020
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8BGV8
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
ADP Binding MOAD:  4OAG Kd: 500 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.173 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 62.068α = 90
b = 80.811β = 105.74
c = 65.376γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
XSCALEdata 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: 2014-01-22
    Type: Initial release
  • Version 1.1: 2014-03-26
    Changes: Database references