Journal
JOURNAL OF STRUCTURAL BIOLOGY
Volume 181, Issue 1, Pages 1-10Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jsb.2012.10.015
Keywords
Bcl-2 proteins; BH3 motif; Innate immunity; Apoptosis; Toll-like receptor signaling; Viral immune evasion; Poxvirus
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Poxviruses have evolved numerous mechanisms to evade host innate immunity. Sensory pathways that are activated by Toll-like and nucleotide receptors, as well as innate cell death pathways, are both targets of antagonism by viral proteins. Recent structural, biochemical and functional studies of poxvirus proteins have identified a family of a-helical proteins that adopt a Bcl-2 fold despite highly divergent polypeptide sequences from cellular proteins that regulate apoptosis. These newly identified proteins have assumed new roles in antagonism of NF-kappa B and interferon signaling pathways and interfere with the release of pro-inflammatory cytokines. Structures of isolated viral proteins and their complexes with cellular targets provide insight into the diverse ways that the Bcl-2 scaffold can be exploited for antagonism of host immunity. (C) 2012 Elsevier Inc. All rights reserved.
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