4BN1

Crystal structure of V174M mutant of Aurora-A kinase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Insights Into Aurora-A Kinase Activation Using Unnatural Amino Acids Incorporated by Chemical Modification.

Rowan, F.C.Richards, M.Bibby, R.A.Thompson, A.Bayliss, R.Blagg, J.

(2013) ACS Chem Biol 8: 2184

  • DOI: https://doi.org/10.1021/cb400425t
  • Primary Citation of Related Structures:  
    4BN1

  • PubMed Abstract: 

    Most protein kinases are regulated through activation loop phosphorylation, but the contributions of individual sites are largely unresolved due to insufficient control over sample phosphorylation. Aurora-A is a mitotic Ser/Thr protein kinase that has two regulatory phosphorylation sites on its activation loop, T287 and T288. While phosphorylation of T288 is known to activate the kinase, the function of T287 phosphorylation is unclear. We applied site-directed mutagenesis and selective chemical modification to specifically introduce bioisosteres for phospho-threonine and other unnatural amino acids at these positions. Modified Aurora-A proteins were characterized using a biochemical assay measuring substrate phosphorylation. Replacement of T288 with glutamate and aspartate weakly stimulated activity. Phospho-cysteine, installed by chemical synthesis from a corresponding cysteine residue introduced at position 288, showed catalytic activity approaching that of the comparable phospho-serine protein. Unnatural amino acid residues, with longer side chains, inserted at position 288 were autophosphorylated and supported substrate phosphorylation. Aurora-A activity is enhanced by phosphorylation at position 287 alone but is suppressed when position 288 is also phosphorylated. This is rationalized by competition between phosphorylated T287 and T288 for a binding site composed of arginines, based on a structure of Aurora-A in which phospho-T287 occupies this site. This is, to our knowledge, the first example of a Ser/Thr kinase whose activity is controlled by the phosphorylation state of adjacent residues in its activation loop. Overall we demonstrate an approach that combines mutagenesis and selective chemical modification of selected cysteine residues to investigate otherwise impenetrable aspects of kinase regulation.


  • Organizational Affiliation

    Cancer Research UK Cancer Therapeutics Unit, Division of Cancer Therapeutics, The Institute of Cancer Research , 15 Cotswold Road, Sutton, Surrey, SM2 5NG, U.K.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
AURORA KINASE A285Homo sapiensMutation(s): 1 
EC: 2.7.11.1
UniProt & NIH Common Fund Data Resources
Find proteins for O14965 (Homo sapiens)
Explore O14965 
Go to UniProtKB:  O14965
PHAROS:  O14965
GTEx:  ENSG00000087586 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14965
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
TPO
Query on TPO
A
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.195 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.615α = 90
b = 81.615β = 90
c = 175.385γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-03-26
    Type: Initial release
  • Version 1.1: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description