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Journal of Virology, December 1998, p. 10218-10221, Vol. 72, No. 12
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Equine Infectious Anemia Virus Gag Polyprotein Late Domain Specifically Recruits Cellular AP-2 Adapter Protein Complexes during Virion Assembly

Bridget A. Puffer,1 S. C. Watkins,2 and Ronald C. Montelaro1,*

Department of Molecular Genetics and Biochemistry1 and Department of Cell Biology and Physiology,2 University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261

Received 16 June 1998/Accepted 21 August 1998

We have identified an interaction between the equine infectious anemia virus (EIAV) late assembly domain and the cellular AP-2 clathrin-associated adapter protein complex. A YXXL motif within the EIAV Gag late assembly domain was previously characterized as a sequence critical for release of assembling virions. We now show that this YXXL sequence interacts in vitro with the AP-50 subunit of the AP-2 complex, while the functionally interchangeable late assembly domains carried by the Rous sarcoma virus p2b protein and human immunodeficiency virus type 1 p6 protein, which utilize PPPY and PTAPP L domains, respectively, do not bind AP-50 in vitro. In addition, EIAV late domain mutants containing mutations that have previously been shown to abrogate budding also exhibit marked decreases in AP-50 binding efficiencies. A role for AP-2 complex in viral assembly is supported by immunofluorescence analysis of EIAV-infected equine dermal cells demonstrating specific colocalization of the alpha  adaptin subunit of AP-2 with the EIAV p9 protein at sites of virus budding on the plasma membrane. These data provide strong evidence that EIAV utilizes the cellular AP-2 complex to accomplish virion assembly and release.

* Corresponding author. Mailing address: Department of Molecular Genetics and Biochemistry, University of Pittsburgh School of Medicine, W1144 Biomedical Science Tower, Pittsburgh, PA 15261. Phone: (412) 648-8869. Fax: (412) 383-8859. E-mail: rmont{at}pop.pitt.edu.

Journal of Virology, December 1998, p. 10218-10221, Vol. 72, No. 12
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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Copyright © 1998 by the American Society for Microbiology. All rights reserved.