Feline leukemia virus envelope and gag proteins (FeLV Env and Gag proteins)

The feline leukemia virus envelope and gag proteins are viral structural components essential for FeLV replication and pathogenesis. The gag gene encodes a polyprotein precursor that is proteolytically processed into individual proteins (p15, p12, p30, p10) that form the viral core structure and facilitate RNA packaging[2]. The envelope gene encodes a glycoprotein precursor (gp85) that is cleaved into the surface unit (SU/gp70) and transmembrane protein (TM/p15E)[1][5]. The envelope SU contains variable regions (VRA and VRB) that determine receptor specificity, with different FeLV subgroups using distinct cellular receptors for viral entry. FeLV-B variants utilize Pit1 and Pit2 phosphate transporters as receptors, with specific amino acid residues like arginine at position 73 in VRA being critical for Pit2 receptor recognition[1]. These proteins share significant sequence homology with murine leukemia virus, suggesting common evolutionary origins[2]. The envelope and gag proteins are used in retroviral vector systems for gene therapy applications, where understanding their receptor specificity and processing is important for vector design and targeting[1][5].

Other names

FeLV envelope glycoproteinFeLV Gag polyproteinp15p12p30p10gp85gp70p15E

Not applicable as a drug target; however, the envelope proteins mediate viral entry through interaction with cellular receptors Pit1 and Pit2 (phosphate transporters)