Selenium-dependent glutathione peroxidase modules encoded by RNA viruses.

Abstract:

:Glutathione peroxidase (GPx) is the prototypical eukaryotic selenoprotein, with the rare amino acid selenocysteine (Sec) at the enzyme active site, encoded by the UGA codon in RNA. A DNA virus, Molluscum contagiosum, has now been shown to encode a functional selenium-dependent GPx enzyme. Using modifications of conventional sequence database searching techniques to locate potential viral GPx modules, combined with structurally guided comparative sequence analysis, we provide compelling evidence that Se-dependent GPx modules are encoded in a number of RNA viruses, including potentially serious human pathogens like HIV-1 and hepatitis C virus, coxsackievirus B3, HIV-2, and measles virus. Analysis of the sequences of multiple viral isolates reveals conservation of the putative GPx-related features, at least within viral subtypes or genotypes, supporting the hypothesis that these are functional GPx modules.

journal_name

Biol Trace Elem Res

authors

Zhang W,Ramanathan CS,Nadimpalli RG,Bhat AA,Cox AG,Taylor EW

doi

10.1007/BF02783852

subject

Has Abstract

pub_date

1999-11-01 00:00:00

pages

97-116

issue

2

eissn

0163-4984

issn

1559-0720

journal_volume

70

pub_type

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