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J Gen Virol 84 (2003), 621-627; DOI 10.1099/vir.0.18886-0

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© 2003 Society for General Microbiology

Short Communication

Delineation of sequences important for efficient packaging of feline immunodeficiency virus RNA

Matthew T. Browning1, Farah Mustafa2, Russell D. Schmidt1, Kathy A. Lew1 and Tahir A. Rizvi1,2

1 The University of Texas MD Anderson Cancer Center, Department of Veterinary Sciences, Bastrop, TX 78602, USA
2 Department of Medical Microbiology, Faculty of Medicine and Health Sciences (FMHS), The United Arab Emirates University, PO Box 17666, Al Ain, United Arab Emirates

Correspondence
Tahir Rizvi (at UAE University)
tarizvi{at}uaeu.ac.ae

We have used systematic deletion analysis of the 5' untranslated region (UTR) of the feline immunodeficiency virus (FIV) genome, both in the presence and absence of various amounts of gag, to define the cis-acting sequences responsible for efficient RNA packaging. Our analyses revealed that the primary FIV packaging signal consists of two essential core elements located within the first 90–120 bp of the 5'UTR and the first 90 bp of the gag gene. Interestingly, the region between the major splice donor (SD) and gag, including ~130–160 bp upstream of the SD, is dispensable for encapsidation. Finally, other determinants of packaging were found to be present in the viral LTR and/or within the 3' end of the viral genome. Taken together, our results suggest that the primary packaging determinants of FIV are multipartite and discontinuous, composed of two elements within the 5'UTR and gag gene.




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