The open reading frame (ORF) 50a gene product regulates ORF 57 gene expression in herpesvirus saimiri.

Abstract:

:We have previously demonstrated that open reading frame (ORF) 50 and ORF 57 encode transcriptional regulating genes in herpesvirus saimiri. ORF 50, a homolog of Epstein-Barr virus R protein, is a sequence-specific transactivator, whereas ORF 57 acts posttranscriptionally. In this report, we demonstrate that the ORF 57 gene is regulated by the ORF 50a gene product. We show that the ORF 57 gene is expressed at basal levels early in the virus replication cycle and that thereafter it is transactivated by the ORF 50a gene product, due to an increase in RNA levels. As it has been shown that the ORF 57 gene product downregulates ORF 50a due to the presence of its intron, these combined observations identify a feedback mechanism modulating gene expression in herpesvirus saimiri, whereby ORF 50a transcription is downregulated by the ORF 57 gene product, a gene which it specifically transactivates. Furthermore, we propose that the intron-containing ORF 57 gene downregulates itself by the same mechanism as that for ORF 50a, as both genes are downregulated at similar times during the replication cycle.

journal_name

J Virol

journal_title

Journal of virology

authors

Whitehouse A,Cooper M,Hall KT,Meredith DM

doi

10.1128/JVI.72.3.1967-1973.1998

subject

Has Abstract

pub_date

1998-03-01 00:00:00

pages

1967-73

issue

3

eissn

0022-538X

issn

1098-5514

journal_volume

72

pub_type

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