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Journal of Virology, May 1999, p. 3835-3842, Vol. 73, No. 5
Laboratory of Persistent Viral Diseases,
Rocky Mountain Laboratories, National Institute of Allergy and
Infectious Diseases, National Institutes of Health, Hamilton, Montana
59840
Received 25 August 1998/Accepted 19 January 1999
Aleutian mink disease parvovirus (ADV) is the etiological agent of
Aleutian disease of mink. The acute disease caused by ADV consists of
permissive infection of alveolar type II cells that results in
interstitial pneumonitis. The permissive infection is experimentally
modeled in vitro by infecting Crandell feline kidney (CrFK) cells with
a tissue culture-adapted isolate of ADV, ADV-G. ADV-G VP2 empty virions
expressed in a recombinant baculovirus system were analyzed for the
ability to bind to the surface of CrFK cells. Radiolabeled VP2 virions
bound CrFK cells specifically, while they did not bind either Mus
dunni or Spodoptera frugiperda cells, cells which are
resistant to ADV infection. The binding to CrFK cells was competitively
inhibited by VP2 virions but not by virions of cowpea chlorotic mottle
virus (CCMV), another unenveloped virus similar in size to ADV.
Furthermore, preincubation of CrFK cells with the VP2 virions blocked
infection by ADV-G. The VP2 virions were used in a virus overlay
protein binding assay to identify a single protein of approximately 67 kDa, named ABP (for ADV binding protein), that demonstrates specific
binding of VP2 virions. Exogenously added VP2 virions were able to
competitively inhibit the binding of labeled VP2 virions to ABP, while
CCMV virions had no effect. Polyclonal antibodies raised against ABP reacted with ABP on the outer surface of CrFK cells and blocked infection of CrFK cells by ADV-G. In addition, VP2 virion attachment to
CrFK cells was blocked when the VP2 virions were preincubated with
partially purified ABP. Taken together, these results indicate that ABP
is a cellular receptor for ADV.
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Identification of a Cell Surface Protein from
Crandell Feline Kidney Cells That Specifically Binds Aleutian Mink
Disease Parvovirus
*
Corresponding author. Mailing address: 903 S. 4th St.,
Hamilton, MT 59840. Phone: (406) 363-9284. Fax: (406) 363-9286. E-mail: jfox{at}atlas.niaid.nih.gov.
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