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Microbiology and Molecular Biology Reviews, June 2008, p. 249-265, Vol. 72, No. 2
1092-2172/08/$08.00+0     doi:10.1128/MMBR.00040-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Tegument Proteins of Human Cytomegalovirus

Robert F. Kalejta*

Institute for Molecular Virology and McArdle Laboratory for Cancer Research, University of Wisconsin—Madison, Madison, Wisconsin

Human cytomegalovirus (HCMV) is a common, medically relevant human herpesvirus. The tegument layer of herpesvirus virions lies between the genome-containing capsids and the viral envelope. Proteins within the tegument layer of herpesviruses are released into the cell upon entry when the viral envelope fuses with the cell membrane. These proteins are fully formed and active and control viral entry, gene expression, and immune evasion. Most tegument proteins accumulate to high levels during later stages of infection, when they direct the assembly and egress of progeny virions. Thus, viral tegument proteins play critical roles at the very earliest and very last steps of the HCMV lytic replication cycle. This review summarizes HCMV tegument composition and structure as well as the known and speculated functions of viral tegument proteins. Important directions for future investigation and the challenges that lie ahead are identified and discussed.

* Mailing address: Institute for Molecular Virology, 635A R. M. Bock Laboratories, 1525 Linden Drive, Madison, WI 53706-1596. Phone: (608) 265-5546. Fax: (608) 262-7414. E-mail: rfkalejta{at}wisc.edu

Microbiology and Molecular Biology Reviews, June 2008, p. 249-265, Vol. 72, No. 2
1092-2172/08/$08.00+0     doi:10.1128/MMBR.00040-07
Copyright © 2008, American Society for Microbiology. All Rights Reserved.



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