1HLW

STRUCTURE OF THE H122A MUTANT OF THE NUCLEOSIDE DIPHOSPHATE KINASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.166 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Chemical rescue of phosphoryl transfer in a cavity mutant: a cautionary tale for site-directed mutagenesis.

Admiraal, S.J.Meyer, P.Schneider, B.Deville-Bonne, D.Janin, J.Herschlag, D.

(2001) Biochemistry 40: 403-413

  • DOI: 10.1021/bi002472w
  • Primary Citation of Related Structures:  
    1HLW

  • PubMed Abstract: 
  • We have explored the ability of a nucleoside diphosphate kinase (NDPK) mutant in which the nucleophilic histidine has been replaced by glycine (H122G) to transfer phosphate from ATP to alcohols of varying pK(a), size, shape, and polarity. This cavity mutant does indeed act as a primitive alcohol kinase ...

    We have explored the ability of a nucleoside diphosphate kinase (NDPK) mutant in which the nucleophilic histidine has been replaced by glycine (H122G) to transfer phosphate from ATP to alcohols of varying pK(a), size, shape, and polarity. This cavity mutant does indeed act as a primitive alcohol kinase. The rate of its phosphoryl transfer to alcohols varies considerably, with values spanning a DeltaDeltaG(double dagger) range of 4 kcal/mol, whereas the alcohols have very similar intrinsic reactivities. Analysis of these results suggests that the ability to carry out phosphoryl transfer within the cavity is not a simple function of being small enough to enter the cavity, but rather is a complex function of steric, solvation, entropic, van der Waals packing, and electrostatic properties of the alcohol. In addition, large differences are observed between the reactivities of alcohols within the nucleophile cavity of H122G and the reactivities of the same alcohols within the nucleophile cavity of H122A, a mutant NDPK that differs from H122G by a single methyl group within the cavity. The crystal structures of the two cavity mutants are very similar to one another and to wild-type NDPK, providing no evidence for a structurally perturbed active site. The differences in reactivity between the two mutant proteins illustrate a fundamental limitation of energetic analysis from site-directed mutagenesis: although removal of a side chain is generally considered to be a conservative change, the energetic effects of any given mutation are inextricably linked to the molecular properties of the created cavity and the surrounding protein environment.


    Organizational Affiliation

    Department of Biochemistry, Beckman Center B400, Stanford University, Stanford, California 94305-5307, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
NUCLEOSIDE DIPHOSPHATE KINASEA155Dictyostelium discoideumMutation(s): 1 
Gene Names: ndkC-1gip17ndkBDDB_G0273069ndkC-2DDB_G0273805
EC: 2.7.4.6
UniProt
Find proteins for P22887 (Dictyostelium discoideum)
Explore P22887 
Go to UniProtKB:  P22887
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22887
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.166 
  • Space Group: P 63 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.001α = 90
b = 75.001β = 90
c = 106.169γ = 120
Software Package:
Software NamePurpose
AMoREphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-02-28
    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: 2021-10-27
    Changes: Database references