4WOY

Crystal structure and functional analysis of MiD49, a receptor for the mitochondrial fission protein Drp1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 

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Literature

Crystal structure and functional analysis of MiD49, a receptor for the mitochondrial fission protein Drp1.

Loson, O.C.Meng, S.Ngo, H.Liu, R.Kaiser, J.T.Chan, D.C.

(2015) Protein Sci 24: 386-394

  • DOI: 10.1002/pro.2629
  • Primary Citation of Related Structures:  
    4WOY

  • PubMed Abstract: 
  • Mitochondrial fission requires recruitment of dynamin-related protein 1 (Drp1) to the mitochondrial surface, where assembly leads to activation of its GTP-dependent scission function. MiD49 and MiD51 are two receptors on the mitochondrial outer membrane that can recruit Drp1 to facilitate mitochondrial fission ...

    Mitochondrial fission requires recruitment of dynamin-related protein 1 (Drp1) to the mitochondrial surface, where assembly leads to activation of its GTP-dependent scission function. MiD49 and MiD51 are two receptors on the mitochondrial outer membrane that can recruit Drp1 to facilitate mitochondrial fission. Structural studies indicated that MiD51 has a variant nucleotidyl transferase fold that binds an ADP co-factor essential for activation of Drp1 function. MiD49 shares sequence homology with MiD51 and regulates Drp1 function. However, it is unknown if MiD49 binds an analogous co-factor. Because MiD49 does not readily crystallize, we used structural predictions and biochemical screening to identify a surface entropy reduction mutant that facilitated crystallization. Using molecular replacement, we determined the atomic structure of MiD49 to 2.4 Å. Like MiD51, MiD49 contains a nucleotidyl transferase domain; however, the electron density provides no evidence for a small-molecule ligand. Structural changes in the putative nucleotide-binding pocket make MiD49 incompatible with an extended ligand like ADP, and critical nucleotide-binding residues found in MiD51 are not conserved. MiD49 contains a surface loop that physically interacts with Drp1 and is necessary for Drp1 recruitment to the mitochondrial surface. Our results suggest a structural basis for the differential regulation of MiD51- versus MiD49-mediated fission.


    Organizational Affiliation

    Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California, 91125.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Mitochondrial dynamics protein MID49A, B329Mus musculusMutation(s): 1 
Gene Names: Mief2Gm11Mid49Smcr7
UniProt
Find proteins for Q5NCS9 (Mus musculus)
Explore Q5NCS9 
Go to UniProtKB:  Q5NCS9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5NCS9
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.674α = 90
b = 153.39β = 90
c = 109.015γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-01-28
    Type: Initial release
  • Version 1.1: 2015-03-04
    Changes: Database references