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Journal of Virology, February 2002, p. 1043-1050, Vol. 76, No. 3
0022-538X/01/$04.00+0     DOI: 10.1128/JVI.76.3.1043-1050.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Human Cytomegalovirus UL47 Tegument Protein Functions after Entry and before Immediate-Early Gene Expression

Jill T. Bechtel,{dagger} and Thomas Shenk*

Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544-1014

Received 30 July 2001/ Accepted 17 October 2001

The human cytomegalovirus UL47 open reading frame encodes a 110-kDa protein that is a component of the virion tegument. We have constructed a cytomegalovirus mutant, ADsubUL47, in which the central portion of the UL47 open reading frame has been replaced by two marker genes. The mutant replicated to titers 100-fold lower than those for wild-type virus after infection at either a high or a low input multiplicity in primary human fibroblasts but was substantially complemented on cells expressing UL47 protein. A revertant virus in which the mutation was repaired, ADrevUL47, replicated with wild-type kinetics. Mutant virions lacked UL47 protein and contained reduced amounts of UL48 protein. The mutant was found to be less infectious than wild-type virus, and a defect very early in the replication cycle was observed. Transcription of the viral immediate-early 1 gene was delayed by 8 to 10 h. However, this delay was not the result of a defect in virus entry or of the inability of virion proteins to transactivate the major immediate-early promoter. We also show that the UL47 protein coprecipitated with the UL48 and UL69 tegument proteins and the UL86-encoded major capsid protein. We propose that a UL47-containing complex is involved in the release of viral DNA from the disassembling virus particle and that the loss of UL47 protein causes this process to be delayed.


* Corresponding author. Mailing address: Department of Molecular Biology, Princeton University, Princeton, NJ 08544-1014. Phone: (609) 258-5992. Fax: (609) 258-1704. E-mail: tshenk{at}princeton.edu.

{dagger} Present address: Departments of Microbiology and Immunology and Medicine, University of California Medical Center, San Francisco, CA 94143-0414.


Journal of Virology, February 2002, p. 1043-1050, Vol. 76, No. 3
0022-538X/01/$04.00+0     DOI: 10.1128/JVI.76.3.1043-1050.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.




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