当前位置： SCI文献检索 > BIOORGANIC CHEMISTRY期刊下所有文献 > A new nonhydrolyzable reactive cAMP analog, (Sp)-adenosine-3',5'-cyclic-S-(4-bromo-2,3-dioxobutyl)monophosphorothioate irreversibly inactivates human platelet cGMP-inhibited cAMP phosphodiesterase.

A new nonhydrolyzable reactive cAMP analog, (Sp)-adenosine-3',5'-cyclic-S-(4-bromo-2,3-dioxobutyl)monophosphorothioate irreversibly inactivates human platelet cGMP-inhibited cAMP phosphodiesterase.

Abstract：

:Levels of cAMP that control critical platelet functions are regulated by cGMP-inhibited cAMP phosphodiesterase (PDE3A). We previously showed that millimolar concentrations of the hydrolyzable 8-[(4-bromo-2,3-dioxobutyl)thioadenosine 3',5'-cyclic monophosphate (8-BDB-TcAMP) inactivate PDE3A. We have now synthesized a nonhydrolyzable affinity label to probe the active site of PDE3A. The nonhydrolyzable adenosine 3',5'-cyclic monophosphorothioates, Sp-cAMPS and Rp-cAMPS, function as competitive inhibitors of PDE3A with K(i) = 47.6 and 4400 microM, respectively. We therefore coupled Sp-cAMPS with 1,4-dibromobutanedione to yield (Sp)-adenosine-3',5'-cyclic-S-(4-bromo-2,3-dioxobutyl)monophosphorothioate, [Sp-cAMPS-(BDB)]. Sp-cAMPS-(BDB) inactivates PDE3A in a time-dependent, irreversible reaction with k(max) = 0.0116 min(-1) and K(I) = 10.1 microM. The order of effectiveness of protectants in decreasing the rate of inactivation (with K(d) in microM) is: Sp-cAMPS (24) > Rp-cGMPS (1360), Sp-cGMPS (1460) > GMP (4250), AMP (10600), Rp-cAMPS (22170). These results suggest that the inactivation of PDE3A by Sp-cAMPS-(BDB) is a consequence of reaction at the overlap of the cAMP and cGMP binding regions in the active site.

journal_name

Bioorg Chem

journal_title

Bioorganic chemistry

authors

Hung SH,Madhusoodanan KS,Beres JA,Boyd RL,Baldwin JL,Zhang W,Colman RW,Colman RF

doi

10.1006/bioo.2001.1226

subject

Has Abstract

pub_date

2002-02-01 00:00:00

pages

16-31

issue

1

eissn

0045-2068

issn

1090-2120

pii

S004520680191226X

journal_volume

30

pub_type

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