Affinity labeling of cAMP-dependent protein kinase with p-fluorosulfonylbenzoyl adenosine. Covalent modification of lysine 71.
p-Fluorosulfonylbenzoyl 5'-adenosine (FSO2BzAdo) was shown previously to be an irreversible inhibitor of the catalytic subunit of cAMP-dependent protein kinase II from porcine skeletal muscle (Zoller, M. J., and Taylor, S. S. (1979) J. Biol. Chem. 254, 8363-8368). The catalytic subunit of porcine heart cAMP-dependent protein kinase was also inhibited following incubation with FSO2[14C]BzAdo, and inhibition was shown to result from the stoichiometric, covalent modification of a single lysine residue. The amino acid sequence in an extended region around the carboxybenzenesulfonyl lysine (CBS-lysine) was elucidated by characterizing both tryptic and cyanogen bromide peptides containing the 14C-modified residue. The sequence in this region was Leu-Val-Lys-His-Lys-Glu-Thr-Gly-Asn-His-Phe-Ala-Met-Lys(CBS)-Ile-Leu-Asp-Lys-Glu-Lys-Val-Val-Lys-Leu-Lys-Gln-Ile. The covalently modified residue corresponded to lysine 71 in the overall polypeptide chain. Homologies to bovine heart catalytic subunit and to a site modified by FSO2BzAdo in phosphofructokinase are considered.
D000241:Adenosine / Q000031:analogs & derivatives* / Q000494:pharmacology; D000345:Affinity Labels / Q000494:pharmacology*; D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002268:Carboxypeptidases; D002851:Chromatography, High Pressure Liquid; D000242:Cyclic AMP / Q000494:pharmacology; D008239:Lysine; D009206:Myocardium / Q000201:enzymology*; D010446:Peptide Fragments / Q000032:analysis; D011494:Protein Kinases / Q000378:metabolism*; D013552:Swine
D000345:Affinity Labels; D000596:Amino Acids; D010446:Peptide Fragments; C010959:5'-(4-fluorosulfonylbenzoyl)adenosine; D000242:Cyclic AMP; D011494:Protein Kinases; D002268:Carboxypeptidases; D008239:Lysine; D000241:Adenosine