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J. Virol., 06 1997, 4857-4861, Vol 71, No. 6
SB Fleming, CA McCaughan, AE Andrews, AD Nash and AA Mercer
A gene encoding a polypeptide with homology to interleukin-10 (IL-10) has
been discovered in the genome of orf virus (OV) strain NZ2, a parapoxvirus
that infects sheep, goats, and humans. The predicted polypeptide sequence
shows high levels of amino acid identity to IL-10 of sheep (80%), cattle
(75%), humans (67%), and mice (64%), as well as IL-10-like proteins of
Epstein-Barr virus (63%) and equine herpesvirus (67%). The C-terminal
region, comprising two-thirds of the OV protein, is identical to ovine
IL-10, which suggests that this gene has been captured from its host sheep
during the evolution of OV. The IL-10-like gene is transcribed early.
Conditioned medium from COS cells transfected with a eukaryotic expression
vector containing the OV IL-10- like gene showed the same biological
activity as ovine IL-10 in a murine thymocyte proliferation assay. OV IL-10
is likely to be important in immune evasion by OV, since IL-10 is a
multifunctional cytokine that has inhibitory effects on nonspecific
immunity and Th1 effector function.
Copyright © 1997, American Society for Microbiology
A homolog of interleukin-10 is encoded by the poxvirus orf virus
Health Research Council Virus Research Unit and University of Otago Centre for Gene Research, University of Otago, Dunedin, New Zealand. steve@sanger.otago.ac.nz
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