Biological, molecular, and structural analysis of a cytopathic variant from a molecularly cloned simian immunodeficiency virus

C C LaBranche, M M Sauter, B S Haggarty, P J Vance, J Romano, T K Hart, P J Bugelski, J A Hoxie
1994 Journal of Virology  
In the present study, we describe the isolation and characterization of a SIVmac variant, derived from the BK28 infectious molecular clone, that became highly cytopathic for Sup-Tl cells. This variant, termed CP-MAC, exhibited a number of differences from BK28, including (i) an altered tropism which largely restricted its host range to Sup-Tl cells, (ii) the ability to induce cell fusion and CD4 down-modulation, and (iii) a highly stable interaction of its external (SU) and transmembrane (TM)
more » ... ransmembrane (TM) envelope glycoproteins. In addition, a marked increase in the level of surface envelope glycoproteins was observed both on CP-MAC-infected cells and on virions. The CP-MAC env gene was PCR amplified from infected cells, and sequence analysis identified five amino acid changes in SU and six in TM compared with BK28. The introduction of these changes into BK28 was shown to fully reconstitute the biological and morphological properties of CP-MAC. The limited number
doi:10.1128/jvi.68.9.5509-5522.1994 fatcat:vvn6xmkbyjgbni2qyba36shwxu