Mapping the sequences that mediate interaction of the equine herpesvirus 1 immediate-early protein and human TFIIB.

Abstract:

:The sole immediate-early (IE) gene of equine herpesvirus 1 encodes a 1,487-amino-acid (aa) regulatory phosphoprotein that independently activates expression of early viral genes. Coimmunoprecipitation assays demonstrated that the IE protein physically interacts with the general transcription factor TFIIB. Using a variety of protein-binding assays that employed a panel of IE truncation and deletion mutants expressed as in vitro-synthesized or glutathione S-transferase fusion proteins, we mapped a TFIIB-binding domain to aa 407 to 757 of the IE protein. IE mutants carrying internal deletions of aa 426 to 578 and 621 to 757 were partially defective for TFIIB binding, indicating that aa 407 to 757 may harbor more than one TFIIB-binding domain. The interaction between the IE protein and TFIIB is of physiological importance, as evidenced by transient-cotransfection assays. Partial deletion of the TFIIB-binding domain within the IE protein inhibited its ability to activate expression of the viral thymidine kinase gene, a representative early promoter, and of the IR5 gene, a representative late promoter, by greater than 20 and 50%, respectively. These results indicate that the interaction of the IE protein with TFIIB is necessary for its full transactivation function and that the IE-TFIIB interaction may be part of the mechanism by which the IE protein activates transcription.

journal_name

J Virol

journal_title

Journal of virology

authors

Jang HK,Albrecht RA,Buczynski KA,Kim SK,Derbigny WA,O'Callaghan DJ

doi

10.1128/JVI.75.21.10219-10230.2001

subject

Has Abstract

pub_date

2001-11-01 00:00:00

pages

10219-30

issue

21

eissn

0022-538X

issn

1098-5514

journal_volume

75

pub_type

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