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Herpes Simplex Virus 1 (HSV-1) ICP22 Protein Directly Interacts with Cyclin-Dependent Kinase (CDK) 9 to Inhibit RNA Polymerase II Transcription Elongation

Lookup NU author(s): Dr Sonja Baumli



The Herpes Simplex Virus 1 (HSV-1)-encoded ICP22 protein plays an important role in viral infection and affects expression of host cell genes. ICP22 is known to reduce the global level of serine (Ser) 2 phosphorylation of the Tyr1Ser2Pro3Thr4Ser5Pro6Ser7 heptapeptide repeats comprising the carboxy-terminal domain (CTD) of the large subunit of RNA polymerase (pol) II. Accordingly, ICP22 is thought to associate with and inhibit the activity of the positive-transcription elongation factor b (P-TEFb) pol II CTD Ser2 kinase. We show here that ICP22 causes loss of CTD Ser2 phosphorylation from pol II engaged in transcription of protein-coding genes following ectopic expression in HeLa cells and that recombinant ICP22 interacts with the CDK9 subunit of recombinant P-TEFb. ICP22 also interacts with pol II in vitro. Residues 193 to 256 of ICP22 are sufficient for interaction with CDK9 and inhibition of pol II CTD Ser2 phosphorylation but do not interact with pol II. These results indicate that discrete regions of ICP22 interact with either CDK9 or pol II and that ICP22 interacts directly with CDK9 to inhibit expression of host cell genes.

Publication metadata

Author(s): Zaborowska J, Baumli S, Laitem C, O'Reilly D, Thomas PH, O'Hare P, Murphy S

Publication type: Article

Publication status: Published

Journal: PLoS ONE

Year: 2014

Volume: 9

Issue: 9

Online publication date: 18/09/2014

Acceptance date: 13/08/2014

Date deposited: 01/12/2014

ISSN (electronic): 1932-6203

Publisher: Public Library of Science


DOI: 10.1371/journal.pone.0107654


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Funder referenceFunder name
088542/Z/09/ZWellcome Trust
092483/Z/10/ZWellcome Trust
A459Rosetrees Trust
G0901526Medical Research Council
LC0910-004Oxford Martin School
MR/L000148/1Medical Research Council
RF202EPA Trust