Biochemical characterization of suramin as a selective inhibitor for the PKA-mediated phosphorylation of HBV core protein in vitro.

Abstract:

:The inhibitory effect of suramin on the phosphorylation of GST-HBV core fusion protein (GST-Hcore) and two GST-Hcore fusion polypeptides (Hcore157B and Hcore164B) by two alpha-type cAMP-dependent protein kinases (PKAIalpha and PKAIIalpha) was biochemically investigated in vitro. It was found that (i) this phosphorylation was inhibited by suramin at a low concentration (IC(50)=approx. 10 nM); (ii) a relative high dose of suramin was required to inhibit an autophosphorylation of PKAIIalpha (IC(50)=approx. 0.7 muM) and the PKAIIalpha-mediated phosphorylation of histone H2B (IC(50)=approx. 0.4 muM); (iii) the PKAIIalpha-mediated phosphorylation of Hcore157B was more sensitive to suramin than the phosphorylation of Hcore157B by Ca(2+)-dependent protein kinase (PKC); and (iv) suramin had a high binding affinity for Hcore157B, but not for histone H2B in vitro. These results suggest that suramin selectively inhibits the PKA-mediated phosphorylation of HBV-CP through the direct binding in vitro of suramin to the Arg-rich C-terminal region (containing three potential phosphorylation sites for PKA) on HBV-CP.

journal_name

Biol Pharm Bull

authors

Okabe M,Enomoto M,Maeda H,Kuroki K,Ohtsuki K

doi

10.1248/bpb.29.1810

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

1810-4

issue

9

eissn

0918-6158

issn

1347-5215

pii

JST.JSTAGE/bpb/29.1810

journal_volume

29

pub_type

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