This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Reprints and Permissions Copyright Information Books from ASM Press MicrobeWorld Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Aasted, B Articles by Bloom, M E Search for Related Content PubMed PubMed Citation Articles by Aasted, B Articles by Bloom, M E

 Previous Article  |  Next Article 

J Virol. 1984 July; 51(1): 7-13

Aleutian disease virus, a parvovirus, is proteolytically degraded during in vivo infection in mink.

ABSTRACT

The polypeptides of the highly virulent mink-passaged Utah I and the nonvirulent cell culture-adapted ADV-G strain of Aleutian disease virus (ADV) were compared. When CRFK cells infected with either Utah I or ADV-G were analyzed by immunoprecipitation, both viruses induced proteins with molecular weights characteristic of the ADV-G 85,000 ( 85k )- and 75k-dalton structural proteins (p85 and p75) as well as the 71k -dalton nonvirion protein p71 . However, when Utah I, Pullman ADV, and DK ADV (a Danish isolate of ADV) were purified from infected mink, only polypeptides with molecular weights between 27k and 30k could be identified. In addition, trypsin treatment of ADV-G degraded p85 and p75 to smaller antigenic proteins with molecular weights of 24k and 27k, similar to those found for the virulent in vivo viruses. The effect of proteolytic treatment of ADV was then studied in detail. Purification of Utah I ADV from mink organs in the presence of protease inhibitor did not prevent the appearance of the low-molecular-weight proteins and ADV-G proteins were not degraded upon purification from a homogenate of normal mink organs, suggesting that artifactual proteolysis was not occurring. When a serum pool from terminally diseased mink was analyzed by radioimmunoassay for antibody reactivity against trypsinized and nontrypsinized ADV-G, five times higher reactivity was found for the trypsinized ADV-G than for the nontrypsinized ADV-G, an effect which could not be elicited by chymotrypsin or V8 protease treatment, implying that in vivo-produced ADV was being modulated in vivo by trypsin or a trypsin-like enzyme. Trypsinization was shown not to cause a change in ADV virion density, but to decrease the in vitro infectivity of ADV-G for CRFK cells. These studies suggested that during infection of mink ADV proteins are degraded to highly antigenic smaller polypeptides.

This article has been cited by other articles:

• Bloom, M. E., Best, S. M., Hayes, S. F., Wells, R. D., Wolfinbarger, J. B., McKenna, R., Agbandje-McKenna, M. (2001). Identification of Aleutian Mink Disease Parvovirus Capsid Sequences Mediating Antibody-Dependent Enhancement of Infection, Virus Neutralization, and Immune Complex Formation. J. Virol. 75: 11116-11127 [Abstract] [Full Text]  
• McKenna, R., Olson, N. H., Chipman, P. R., Baker, T. S., Booth, T. F., Christensen, J., Aasted, B., Fox, J. M., Bloom, M. E., Wolfinbarger, J. B., Agbandje-McKenna, M. (1999). Three-Dimensional Structure of Aleutian Mink Disease Parvovirus: Implications for Disease Pathogenicity. J. Virol. 73: 6882-6891 [Abstract] [Full Text]