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Journal of Virology, September 1999, p. 7126-7131, Vol. 73, No. 9
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Human Cytomegalovirus UL36 Protein Is
Dispensable for Viral Replication in Cultured Cells
Catherine E.
Patterson and
Thomas
Shenk*
Howard Hughes Medical Institute, Department
of Molecular Biology, Princeton University, Princeton, New Jersey
08544-1014
Received 11 March 1999/Accepted 21 May 1999
Consistent with earlier analyses of human cytomegalovirus UL36
mRNA, we find that the UL36 protein is present throughout infection. In
fact, it is delivered to the infected cell as a constituent of the
virion. Curiously, much less UL36 protein accumulated in cells infected
with the AD169 strain of human cytomegalovirus than in cells infected
with the Towne or Toledo strain, and localization of the protein in
cells infected with AD169 is strikingly different from that in cell
infected with the Towne or Toledo strain. The variation in steady-state
level of the proteins results from different stabilities of the
proteins. The UL36 proteins from the three viral strains differ by
several amino acid substitutions. However, this variability is not
responsible for the different half-lives because the AD169 and Towne
proteins, which exhibit very different half-lives within infected
cells, exhibit the same half-life when introduced into uninfected cells
by transfection with expression plasmids. We demonstrate that the UL36
protein is nonessential for growth in cultured cells, and we propose
that the ability of the virus to replicate in the absence of UL36
function likely explains the striking strain-specific variation in the
half-life and intracellular localization of the protein.
*
Corresponding author. Mailing address: Howard Hughes
Medical Institute, Department of Molecular Biology, Princeton
University, Princeton, NJ 08544-1014. Phone: (609) 258-5992. Fax: (609)
258-1704. E-mail: tshenk{at}princeton.edu.
Journal of Virology, September 1999, p. 7126-7131, Vol. 73, No. 9
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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