Publication Date:
1991-07-26
Description:
The structure of a 20-amino acid peptide inhibitor bound to the catalytic subunit of cyclic AMP-dependent protein kinase, and its interactions with the enzyme, are described. The x-ray crystal structure of the complex is the basis of the analysis. The peptide inhibitor, derived from a naturally occurring heat-stable protein kinase inhibitor, contains an amphipathic helix that is followed by a turn and an extended conformation. The extended region occupies the cleft between the two lobes of the enzyme and contains a five-residue consensus recognition sequence common to all substrates and peptide inhibitors of the catalytic subunit. The helical portion of the peptide binds to a hydrophobic groove and conveys high affinity binding. Loops from both domains converge at the active site and contribute to a network of conserved residues at the sites of magnesium adenosine triphosphate binding and catalysis. Amino acids associated with peptide recognition, nonconserved, extend over a large surface area.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Knighton, D R -- Zheng, J H -- Ten Eyck, L F -- Xuong, N H -- Taylor, S S -- Sowadski, J M -- RR01644/RR/NCRR NIH HHS/ -- T32CA09523/CA/NCI NIH HHS/ -- T32DK07233/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1991 Jul 26;253(5018):414-20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, University of California, San Diego, La Jolla 92093-0654.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1862343" target="_blank"〉PubMed〈/a〉
Keywords:
Amino Acid Sequence
;
Carrier Proteins/*chemistry/metabolism
;
Computer Simulation
;
Enzyme Inhibitors/*chemistry
;
*Intracellular Signaling Peptides and Proteins
;
Macromolecular Substances
;
Models, Molecular
;
Molecular Sequence Data
;
Protein Conformation
;
Protein Kinases/*chemistry/metabolism
;
X-Ray Diffraction
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
