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Species- or isozyme-specific enzyme inhibitors. 7. Selective effects in inhibitions of rat adenylate kinase isozymes by adenosine 5'-phosphate derivatives.

Abstract：

:Monosubstituted derivatives of adenosine 5'-phosphate (AMP) with substituents of 1-3 atoms or group replacements at any of 11 positions have been synthesized and examined as substrates and inhibitors of the rat muscle adenylate kinase isozyme (AK-M), and the rat AK II and III isozymes predominant in poorly differentiated hepatoma tissue and normal liver tissue, respectively. Inhibition indexes of the compounds were expressed as KM (AMP)/Ki for competitive inhibition or as KM (AMP)/KM when only KM was available. Substituents at N(1), N6, or C(8) or on ionizable phosphate oxygen reduced inhibition below measurable levels; 2'-deoxy-AMP and adenosine 5'-sulfate had identical inhibition indexes with all three isozymes; compounds with substituents at C(2), O(2'), O(3'), C(4'), C(5'), or O(5') had higher inhibition indexes with AK-M than with AK II or III and the same or similar indexes for AK II and III. The most effective and/or selective inhibitors were 2-NHMe-AMP (index with AK-M, 0.2; index ratio, AK-M/AK III, 9.1), 2'-O-Me-AMP (index with AK-M, 0.14; index ratio, AK-M/AK III, 8.2), 2',3'-O-CMe2-AMP (index with AK-M, 0.25; index ratio, AK-M/AK II, 6.6), 4'-allyl-AMP (index with AK-M, 0.97; index ratio, AK-M/AK III, 8.1), and 5'(S)-Et-AMP (index with AK-M, 0.64; index ratio, AK-M/AK II, 11.2). The study provides additional evidence that the attachment of simple substituents to various atoms in turn of a substrate is a potentially useful approach in early stages of the attempted design of isozyme-selective inhibitors.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Hai TT,Picker D,Abo M,Hampton A

doi

10.1021/jm00349a008

subject

Has Abstract

pub_date

1982-07-01 00:00:00

pages

806-12

issue

7

eissn

0022-2623

issn

1520-4804

journal_volume

25

pub_type

杂志文章

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