Document Detail

The crystal structure of a phosphorylase kinase peptide substrate complex: kinase substrate recognition.
MedLine Citation:
PMID:  9362479     Owner:  NLM     Status:  MEDLINE    
The structure of a truncated form of the gamma-subunit of phosphorylase kinase (PHKgammat) has been solved in a ternary complex with a non-hydrolysable ATP analogue (adenylyl imidodiphosphate, AMPPNP) and a heptapeptide substrate related in sequence to both the natural substrate and to the optimal peptide substrate. Kinetic characterization of the phosphotransfer reaction confirms the peptide to be a good substrate, and the structure allows identification of key features responsible for its high affinity. Unexpectedly, the substrate peptide forms a short anti-parallel beta-sheet with the kinase activation segment, the region which in other kinases plays an important role in regulation of enzyme activity. This anchoring of the main chain of the substrate peptide at a fixed distance from the gamma-phosphate of ATP explains the selectivity of PHK for serine/threonine over tyrosine as a substrate. The catalytic core of PHK exists as a dimer in crystals of the ternary complex, and the relevance of this phenomenon to its in vivo recognition of dimeric glycogen phosphorylase b is considered.
E D Lowe; M E Noble; V T Skamnaki; N G Oikonomakos; D J Owen; L N Johnson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The EMBO journal     Volume:  16     ISSN:  0261-4189     ISO Abbreviation:  EMBO J.     Publication Date:  1997 Nov 
Date Detail:
Created Date:  1998-01-05     Completed Date:  1998-01-05     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  8208664     Medline TA:  EMBO J     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  6646-58     Citation Subset:  IM    
Laboratory of Molecular Biophysics and Oxford Centre for Molecular Sciences, University of Oxford, Rex Richards Building, South Parks Road, Oxford OX1 3QU, UK.
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MeSH Terms
Adenylyl Imidodiphosphate / chemistry*,  metabolism
Crystallography, X-Ray
Models, Molecular
Molecular Conformation
Oligopeptides / chemistry*,  metabolism
Peptide Fragments / chemistry
Phosphorylase Kinase / chemistry*,  metabolism
Protein Conformation
Reg. No./Substance:
0/Oligopeptides; 0/Peptide Fragments; 25612-73-1/Adenylyl Imidodiphosphate; EC Kinase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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