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1a/1b subtype profiling of nonnucleoside polymerase inhibitors of hepatitis C virus.

Abstract：

:The RNA-dependent RNA polymerase (NS5B) of hepatitis C virus (HCV) is an unusually attractive target for drug discovery since it contains five distinct drugable sites. The success of novel antiviral therapies will require nonnucleoside inhibitors to be active in at least patients infected with HCV of subtypes 1a and 1b. Therefore, the genotypic assessment of these agents against clinical isolates derived from genotype 1-infected patients is an important prerequisite for the selection of suitable candidates for clinical development. Here we report the 1a/1b subtype profiling of polymerase inhibitors that bind at each of the four known nonnucleoside binding sites. We show that inhibition of all of the clinical isolates tested is maintained, except for inhibitors that bind at the palm-1 binding site. Subtype coverage varies across chemotypes within this class of inhibitors, and inhibition of genotype 1a improves when hydrophobic contact with the polymerase is increased. We investigated if the polymorphism of the palm-1 binding site is the sole cause of the reduced susceptibility of subtype 1a to inhibition by 1,5-benzodiazepines by using reverse genetics, X-ray crystallography, and surface plasmon resonance studies. We showed Y415F to be a key determinant in conferring resistance on subtype 1a, with this effect being mediated through an inhibitor- and enzyme-bound water molecule. Binding studies revealed that the mechanism of subtype 1a resistance is faster dissociation of the inhibitor from the enzyme.

journal_name

J Virol

journal_title

Journal of virology

authors

Nyanguile O,Devogelaere B,Vijgen L,Van den Broeck W,Pauwels F,Cummings MD,De Bondt HL,Vos AM,Berke JM,Lenz O,Vandercruyssen G,Vermeiren K,Mostmans W,Dehertogh P,Delouvroy F,Vendeville S,VanDyck K,Dockx K,Cleiren E,R

doi

10.1128/JVI.01980-09

subject

Has Abstract

pub_date

2010-03-01 00:00:00

pages

2923-34

issue

6

eissn

0022-538X

issn

1098-5514

pii

JVI.01980-09

journal_volume

84

pub_type

杂志文章

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