Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.184 

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The human nm23-H4 gene product is a mitochondrial nucleoside diphosphate kinase.

Milon, L.Meyer, P.Chiadmi, M.Munier, A.Johansson, M.Karlsson, A.Lascu, I.Capeau, J.Janin, J.Lacombe, M.L.

(2000) J Biol Chem 275: 14264-14272

  • DOI: https://doi.org/10.1074/jbc.275.19.14264
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    We demonstrate here the catalytic activity and subcellular localization of the Nm23-H4 protein, product of nm23-H4, a new member of the human nm23/nucleoside diphosphate (NDP) kinase gene family (Milon, L., Rousseau-Merck, M., Munier, A., Erent, M., Lascu, I., Capeau, J., and Lacombe, M. L. (1997) Hum. Genet. 99, 550-557). Nm3-H4 was synthesized in escherichia coli as the full-length protein and as a truncated form missing the N-terminal extension characteristic of mitochondrial targeting. The truncated form possesses NDP kinase activity, whereas the full-length protein is inactive, suggesting that the extension prevents enzyme folding and/or activity. X-ray crystallographic analysis was performed on active truncated Nm23-H4. Like other eukaryotic NDP kinases, it is a hexamer. Nm23-H4 naturally possesses a serine residue at position 129, equivalent to the K-pn mutation of the Drosophila NDP kinase. The x-ray structure shows that the presence of Ser(129) has local structural effects that weaken subunit interactions. Site-directed mutagenesis shows that the serine is responsible for the lability of Nm23-H4 to heat and urea treatment, because the S129P mutant is greatly stabilized. Examination of human embryonic kidney 293 cells transfected with green fluorescent protein fusions by confocal microscopy shows a specific mitochondrial localization of Nm23-H4 that was also demonstrated by Western blot analysis of subcellular fractions of these cells. Import into mitochondria is accompanied by cleavage of the N-terminal extension that results in NDP kinase activity. Submitochondrial fractionation indicates that Nm23-H4 is associated with mitochondrial membranes, possibly to the contact sites between the outer and inner membranes.

  • Organizational Affiliation

    INSERM U402, Faculté de Médecine Saint-Antoine, 27 rue Chaligny, 75012 Paris, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
162Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for O00746 (Homo sapiens)
Explore O00746 
Go to UniProtKB:  O00746
PHAROS:  O00746
GTEx:  ENSG00000103202 
Entity Groups  
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UniProt GroupO00746
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.184 
  • Space Group: P 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.96α = 90
b = 112.96β = 90
c = 112.96γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-05-17
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.3: 2017-02-01
    Changes: Structure summary
  • Version 1.4: 2024-02-07
    Changes: Data collection, Database references, Derived calculations