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A kinetic study of interactions of (Rp)- and (Sp)-adenosine cyclic 3',5'-phosphorothioates with type II bovine cardiac muscle adenosine cyclic 3',5'-phosphate dependent protein kinase.

Abstract：

:The stereoselectivity of the adenosine cyclic 3',5'-phosphate (cAMP) binding sites on the regulatory subunit of the type II bovine cardiac muscle cAMP-dependent protein kinase was investigated by examining the interactions of (Rp)- and (Sp)-adenosine cyclic 3',5'-phosphorothioates (cAMPS) with these sites. While activation of the holoenzyme and binding to the regulatory subunit of the type II kinase were observed for both of these diastereomers, there were significant differences between the interactions of the cAMPS isomers with the enzyme. In particular, the Sp isomer is more potent than the Rp species not only in the activation of reconstituted, as well as directly isolated, holoenzyme but also in the inhibition of [3H]cAMP binding to the regulatory subunit. A marked preference for the binding of the Sp isomer to site 2 in the regulatory subunit exists. Hydrogen bonding of a functional group on the regulatory subunit with preferential orientation toward the exocyclic oxygen rather than the sulfur of the thiophosphoryl residue may be involved in the observed selectivity of cAMPS binding and activation. In addition to our findings on the stereoselectivity of the binding of cAMPS to cAMP-dependent protein kinase, we have established a method for the reconstitution of holoenzyme from the purified subunits without subjecting the regulatory protein to denaturing conditions.

journal_name

Biochemistry

journal_title

Biochemistry

authors

O'Brian CA,Roczniak SO,Bramson HN,Baraniak J,Stec WJ,Kaiser ET

doi

10.1021/bi00261a028

subject

Has Abstract

pub_date

1982-08-31 00:00:00

pages

4371-6

issue

18

eissn

0006-2960

issn

1520-4995

journal_volume

21

pub_type

杂志文章

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