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Journal of Virology, January 2002, p. 841-850, Vol. 76, No. 2
0022-538X/01/$04.00+0     DOI: 10.1128/JVI.76.2.841-850.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Herpes Simplex Virus Type 1 Immediate-Early Protein ICP0 and Its Isolated RING Finger Domain Act as Ubiquitin E3 Ligases In Vitro

Chris Boutell,1 Seth Sadis,2 and Roger D. Everett1*

Medical Research Council Virology Unit, Glasgow G11 5JR, Scotland, United Kingdom,1 Millenium Pharmaceuticals Inc., Cambridge, Massachusetts2

Received 9 August 2001/ Accepted 19 October 2001

Proteasome-dependent degradation of ubiquitinated proteins plays a key role in many important cellular processes. Ubiquitination requires the E1 ubiquitin activating enzyme, an E2 ubiquitin conjugating enzyme, and frequently a substrate-specific ubiquitin protein ligase (E3). One class of E3 ubiquitin ligases has been shown to contain a common zinc-binding RING finger motif. We have previously shown that herpes simplex virus type 1 ICP0, itself a RING finger protein, induces the proteasome-dependent degradation of several cellular proteins and induces the accumulation of colocalizing conjugated ubiquitin in vivo. We now report that both full-length ICP0 and its isolated RING finger domain induce the accumulation of polyubiquitin chains in vitro in the presence of E1 and the E2 enzymes UbcH5a and UbcH6. Mutations within the RING finger region that abolish the in vitro ubiquitination activity also cause severe reductions in ICP0 activity in other assays. We conclude that ICP0 has the potential to act as an E3 ubiquitin ligase during viral infection and to target specific cellular proteins for destruction by the 26S proteasome.

* Corresponding author. Mailing address: MRC Virology Unit, Church Street, Glasgow G11 5JR, Scotland, United Kingdom. Phone: 41-330-3923. Fax: 41-337-2236. E-mail: r.everett{at}vir.gla.ac.uk.

Journal of Virology, January 2002, p. 841-850, Vol. 76, No. 2
0022-538X/01/$04.00+0     DOI: 10.1128/JVI.76.2.841-850.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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