3ZTQ

Hexagonal crystal form P61 of the Aquifex aeolicus nucleoside diphosphate kinase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.171 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

An Inter-Subunit Disulphide Bridge Stabilizes the Tetrameric Nucleoside Diphosphate Kinase of Aquifex Aeolicus

Boissier, F.Georgescauld, F.Moynie, L.Dupuy, J.-W.Sarger, C.Podar, M.Lascu, L.Giraud, M.-F.Dautant, A.

(2012) Proteins 80: 1658

  • DOI: https://doi.org/10.1002/prot.24062
  • Primary Citation of Related Structures:  
    3ZTO, 3ZTP, 3ZTQ, 3ZTR, 3ZTS

  • PubMed Abstract: 

    The nucleoside diphosphate kinase (Ndk) catalyzes the reversible transfer of the γ-phosphate from nucleoside triphosphate to nucleoside diphosphate. Ndks form hexamers or two types of tetramers made of the same building block, namely, the common dimer. The secondary interfaces of the Type I tetramer found in Myxococcus xanthus Ndk and of the Type II found in Escherichia coli Ndk involve the opposite sides of subunits. Up to now, the few available structures of Ndk from thermophiles were hexameric. Here, we determined the X-ray structures of four crystal forms of the Ndk from the hyperthermophilic bacterium Aquifex aeolicus (Aa-Ndk). Aa-Ndk displays numerous features of thermostable proteins and is made of the common dimer but it is a tetramer of Type I. Indeed, the insertion of three residues in a surface-exposed spiral loop, named the Kpn-loop, leads to the formation of a two-turn α-helix that prevents both hexamer and Type II tetramer assembly. Moreover, the side chain of the cysteine at position 133, which is not present in other Ndk sequences, adopts two alternate conformations. Through the secondary interface, each one forms a disulfide bridge with the equivalent Cys133 from the neighboring subunit. This disulfide bridge was progressively broken during X-ray data collection by radiation damage. Such crosslinks counterbalance the weakness of the common-dimer interface. A 40% decrease of the kinase activity at 60°C after reduction and alkylation of the protein corroborates the structural relevance of the disulfide bridge on the tetramer assembly and enzymatic function.


  • Organizational Affiliation

    Université de Bordeaux, Institut de Biochimie et de Génétique Cellulaires, UMR 5095, F-33077 Bordeaux, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NUCLEOSIDE DIPHOSPHATE KINASE
A, B, C, D, E
A, B, C, D, E, F, G, H
142Aquifex aeolicusMutation(s): 0 
EC: 2.7.4.6
UniProt
Find proteins for O67528 (Aquifex aeolicus (strain VF5))
Explore O67528 
Go to UniProtKB:  O67528
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO67528
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.171 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.36α = 90
b = 116.36β = 90
c = 247.32γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-02-29
    Type: Initial release
  • Version 1.1: 2012-03-14
    Changes: Other
  • Version 1.2: 2012-05-23
    Changes: Other
  • Version 1.3: 2023-12-20
    Changes: Data collection, Database references, Other, Refinement description