* ImmunoGen, 128 Sidney Street, Cambridge, MA 02139; and
Edited by Bernard Roizman, University of Chicago, Chicago, IL,
and approved May 16, 2001 (received for review March 5, 2001)
We have identified a human cytomegalovirus cell-death suppressor,
denoted vICA, encoded by the viral UL36 gene. vICA
inhibits Fas-mediated apoptosis by binding to the pro-domain of
caspase-8 and preventing its activation. vICA does not share
significant sequence homology with FLIPs or other known suppressors of
apoptosis, suggesting that this protein represents a new class
of cell-death suppressors. Notably, resistance to Fas-mediated
apoptosis is delayed in fibroblasts infected with viruses that
encode mutant vICA, suggesting that vICA suppresses
death-receptor-induced cell death in the context of viral infection.
Although vICA is dispensable for viral replication in
vitro, the common targeting of caspase-8 activation by diverse
herpesviruses argues for an important role for this
antiapoptotic mechanism in the pathogenesis of viral infection
in the host, most likely in avoiding immune clearance by cytotoxic
lymphocytes and natural killer cells.
Cell Biology
A cytomegalovirus-encoded inhibitor of apoptosis that
suppresses caspase-8 activation
,
, and
Department of Microbiology and Immunology, Stanford
University School of Medicine, Stanford, CA 94305
To whom reprint requests should be addressed.
E-mail: victor.goldmacher{at}immunogen.com.
www.pnas.org/cgi/doi/10.1073/pnas.141108798
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