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Journal of Virology, February 2000, p. 1313-1320, Vol. 74, No. 3
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Orf Virus Encodes a Novel Secreted Protein
Inhibitor of Granulocyte-Macrophage Colony-Stimulating Factor and
Interleukin-2
David
Deane,1
Colin J.
McInnes,1,*
Ann
Percival,1
Ann
Wood,1
Jackie
Thomson,1
Andrea
Lear,
Janice
Gilray,1
Stephen
Fleming,2
Andrew
Mercer,2 and
David
Haig1
Moredun Research Institute, International
Research Centre, Penicuik, Scotland,1 and
HRC Virus Research Unit, University of Otago, Dunedin, New
Zealand2
Received 2 August 1999/Accepted 4 November 1999
The parapoxvirus orf virus encodes a novel soluble protein
inhibitor of ovine granulocyte-macrophage colony-stimulating factor (GM-CSF) and interleukin-2 (IL-2). The GM-CSF- and IL-2-inhibitory factor (GIF) gene was expressed as an intermediate-late viral gene in
orf virus-infected cells. GIF formed homodimers and tetramers in
solution, and it bound ovine GM-CSF with a Kd
of 369 pM and ovine IL-2 with a Kd of 1.04 nM.
GIF did not bind human GM-CSF or IL-2 in spite of the fact that orf
virus is a human pathogen. GIF was detected in afferent lymph plasma
draining the skin site of orf virus reinfection and was associated with
reduced levels of lymph GM-CSF. GIF expression by orf virus indicates
that GM-CSF and IL-2 are important in host antiviral immunity.
*
Corresponding author. Mailing address: Moredun Research
Institute, International Research Centre, Pentlands Science Park, Bush
Loan, Penicuik EH26 0PZ, Scotland, United Kingdom. Phone: 44 (0)131 445 5111. Fax: 44 (0)131 445 6111. E-mail:
mcinc{at}mri.sari.ac.uk.

Present address: Astra Clinical Research Unit, Edinburgh,
Scotland.
Journal of Virology, February 2000, p. 1313-1320, Vol. 74, No. 3
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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