1E6C

K15M MUTANT OF SHIKIMATE KINASE FROM ERWINIA CHRYSANTHEMI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.188 

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This is version 1.2 of the entry. See complete history


Literature

Biochemical and X-Ray Crystallographic Studies on Shikimate Kinase: The Important Structural Role of the P-Loop Lysine

Krell, T.Maclean, J.Boam, D.J.Cooper, A.Resmini, M.Brocklehurst, K.Kelly, S.M.Price, N.C.Lapthorn, A.J.Coggins, J.R.

(2001) Protein Sci 10: 1137

  • DOI: 10.1110/ps.52501
  • Primary Citation of Related Structures:  
    1E6C

  • PubMed Abstract: 
  • Shikimate kinase, despite low sequence identity, has been shown to be structurally a member of the nucleoside monophosphate (NMP) kinase family, which includes adenylate kinase. In this paper we have explored the roles of residues in the P-loop of shikimate kinase, which forms the binding site for nucleotides and is one of the most conserved structural features in proteins ...

    Shikimate kinase, despite low sequence identity, has been shown to be structurally a member of the nucleoside monophosphate (NMP) kinase family, which includes adenylate kinase. In this paper we have explored the roles of residues in the P-loop of shikimate kinase, which forms the binding site for nucleotides and is one of the most conserved structural features in proteins. In common with many members of the P-loop family, shikimate kinase contains a cysteine residue 2 amino acids upstream of the essential lysine residue; the side chains of these residues are shown to form an ion pair. The C13S mutant of shikimate kinase was found to be enzymatically active, whereas the K15M mutant was inactive. However, the latter mutant had both increased thermostability and affinity for ATP when compared to the wild-type enzyme. The structure of the K15M mutant protein has been determined at 1.8 A, and shows that the organization of the P-loop and flanking regions is heavily disturbed. This indicates that, besides its role in catalysis, the P-loop lysine also has an important structural role. The structure of the K15M mutant also reveals that the formation of an additional arginine/aspartate ion pair is the most likely reason for its increased thermostability. From studies of ligand binding it appears that, like adenylate kinase, shikimate kinase binds substrates randomly and in a synergistic fashion, indicating that the two enzymes have similar catalytic mechanisms.


    Related Citations: 
    • The Three-Dimensional Structure of Shikimate Kinase
      Krell, T., Coggins, J.R., Lapthorn, A.J.
      (1998) J Mol Biol 278: 983

    Organizational Affiliation

    Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, Scotland, UK.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SHIKIMATE KINASEA, B173Dickeya chrysanthemiMutation(s): 1 
Gene Names: aroLaroM
EC: 2.7.1.71
UniProt
Find proteins for P10880 (Dickeya chrysanthemi)
Explore P10880 
Go to UniProtKB:  P10880
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.188 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.86α = 90
b = 106.94β = 119.96
c = 42.75γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-06-20
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance