Affinity labeling of cAMP-dependent protein kinase with p-fluorosulfonylbenzoyl adenosine. Covalent modification of lysine 71 - PubMed (original) (raw)
. 1981 Nov 10;256(21):10837-42.
- PMID: 6270132
Free article
Affinity labeling of cAMP-dependent protein kinase with p-fluorosulfonylbenzoyl adenosine. Covalent modification of lysine 71
M J Zoller et al. J Biol Chem. 1981.
Free article
Abstract
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.
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