Document Detail


Functional malleability of the carboxyl-terminal tail in protein kinase A.
MedLine Citation:
PMID:  8626579     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The catalytic (C) subunit of protein kinase A (PKA) is regarded as a framework for the protein kinase family. Its sequence is composed of a conserved core (residues 40 300) between two segments at the amino and carboxyl termini of the protein. Since the various protein kinases differ in their specificity, it seems reasonable to assume that these nonhomologous segments may be involved in endowing each kinase with its individual specificity. Here we present data to show that the cluster of acidic amino acids (328DDYEEEE334) at the carboxyl-terminal "tail" of the C subunit, specifically Tyr330, contributes to its substrate recognition. This is based on three complementary lines of evidence: (i) on a conformation-sensitive cleavage of the C subunit by a kinase-splitting membranal proteinase that specifically recognizes this cluster, to demonstrate the occurrence in solution of "open" (cleavable) and "closed" (noncleavable) conformations of the C subunit; (ii) on analysis of the three-dimensional structures of the open and closed conformations of the C subunit, showing an approximately 7-A movement of the phenolic hydroxyl of Tyr330 to reach (in the closed conformation) an approximately 3-A distance from the nitrogen atoms of the Arg residue at position p-3 of the PKA consensus sequence; and (iii) on single-site mutations of the C subunit (e.g. Y330A) that show a significant contribution of Tyr330 to the Km of PKA for its substrates/inhibitors and to its catalytic efficacy (Vmax/Km).
Authors:
A Chestukhin; L Litovchick; D Schourov; S Cox; S S Taylor; S Shaltiel
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of biological chemistry     Volume:  271     ISSN:  0021-9258     ISO Abbreviation:  J. Biol. Chem.     Publication Date:  1996 Apr 
Date Detail:
Created Date:  1996-06-21     Completed Date:  1996-06-21     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  2985121R     Medline TA:  J Biol Chem     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  10175-82     Citation Subset:  IM    
Affiliation:
Department of Biological Regulation, Weizmann Institute of Science, Rehovot 76100, Israel.
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MeSH Terms
Descriptor/Qualifier:
Amino Acid Sequence
Animals
Cattle
Cyclic AMP-Dependent Protein Kinases / antagonists & inhibitors,  chemistry*,  metabolism
Endopeptidases / metabolism*
Ligands
Models, Molecular
Molecular Sequence Data
Motion
Oligopeptides / chemistry
Protein Conformation
Rats
Rats, Wistar
Recombinant Proteins
Structure-Activity Relationship
Substrate Specificity
Tyrosine / chemistry
Chemical
Reg. No./Substance:
0/Ligands; 0/Oligopeptides; 0/Recombinant Proteins; 55520-40-6/Tyrosine; 65189-71-1/kemptide; EC 2.7.11.11/Cyclic AMP-Dependent Protein Kinases; EC 3.4.-/Endopeptidases; EC 3.4.99.-/kinase-splitting membranal proteinase

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


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