5X8V

Y92H mutant of thermus thermophilus HB8 thymidylate kinase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.66 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural and functional roles of dynamically correlated residues in thymidylate kinase.

Chaudhary, S.K.Jeyakanthan, J.Sekar, K.

(2018) Acta Crystallogr D Struct Biol 74: 341-354

  • DOI: 10.1107/S2059798318002267
  • Primary Citation of Related Structures:  
    5XT8, 5X8J, 5X8K, 5X8B, 5X8A, 5X8D, 5X8C, 5X86, 5X8V, 5X99, 5X98, 5XAK, 5XAL

  • PubMed Abstract: 
  • Thymidylate kinase is an important enzyme in DNA synthesis. It catalyzes the conversion of thymidine monophosphate to thymidine diphosphate, with ATP as the preferred phosphoryl donor, in the presence of Mg 2+ . In this study, the dynamics of the active site and the communication paths between the substrates, ATP and TMP, are reported for thymidylate kinase from Thermus thermophilus ...

    Thymidylate kinase is an important enzyme in DNA synthesis. It catalyzes the conversion of thymidine monophosphate to thymidine diphosphate, with ATP as the preferred phosphoryl donor, in the presence of Mg 2+ . In this study, the dynamics of the active site and the communication paths between the substrates, ATP and TMP, are reported for thymidylate kinase from Thermus thermophilus. Conformational changes upon ligand binding and the path for communication between the substrates and the protein are important in understanding the catalytic mechanism of the enzyme. High-resolution X-ray crystal structures of thymidylate kinase in apo and ligand-bound states were solved. This is the first report of structures of binary and ternary complexes of thymidylate kinase with its natural substrates ATP and ATP-TMP, respectively. Distinct conformations of the active-site residues, the P-loop and the LID region observed in the apo and ligand-bound structures revealed that their concerted motion is required for the binding and proper positioning of the substrate TMP. Structural analyses provide an insight into the mode of substrate binding at the active site. The residues involved in communication between the substrates were identified through network analysis using molecular-dynamics simulations. The residues identified showed high sequence conservation across species. Biochemical analyses show that mutations of these residues either resulted in a loss of activity or affected the thermal stability of the protein. Further, molecular-dynamics analyses of mutants suggest that the proper positioning of TMP is important for catalysis. These data also provide an insight into the phosphoryl-transfer mechanism.


    Organizational Affiliation

    Computational and Data Sciences, Indian Institute of Science, Bangalore 560 012, India.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Thymidylate kinaseB [auth A], A [auth B]198Thermus thermophilus HB8Mutation(s): 1 
Gene Names: tmkTTHA1607
EC: 2.7.4.9
UniProt
Find proteins for Q5SHX3 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
Explore Q5SHX3 
Go to UniProtKB:  Q5SHX3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.66 Å
  • R-Value Free: 0.198 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.173 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.54α = 90
b = 47.052β = 90
c = 151.48γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-3000data reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-03-14
    Type: Initial release
  • Version 1.1: 2018-04-18
    Changes: Data collection, Database references
  • Version 1.2: 2018-11-21
    Changes: Data collection, Database references