title: Pathogenicity of a mutant friend spleen focus-forming virus encoding an Env-like membrane glycoprotein (gp55) with substitution by a xenotropic murine leukemia virus Env gp70 sequence.
abstract: Friend spleen focus-forming virus (F-SFFV) is a replication-defective acutely leukemogenic mouse retrovirus and encodes an envelope protein (Env)-like membrane glycoprotein (gp55) in its defective env gene, which is responsible for the early stage of the viral leukemogenesis. Gp55 is a modified Env protein and contains a polytropic mink cell focus-inducing (MCF) murine leukemia virus (MuLV) Env gp70-derived sequence in its amino-terminal region. To evaluate the possibility that the presumed binding of gp55 to an MCF MuLV receptor protein has some role in leukemogenesis, we examined the biological activities of a mutant gp55 (XE gp55), which has a xenotropic MuLV Env gp70 amino-terminal region. XE gp55 displayed almost the same biological activities as the wild-type gp55, excluding the above possibility.
authors.affiliation: Gene Technology and Safety Laboratory, Tsukuba Life Science Center, The Institute of Physical and Chemical Research (RIKEN), Ibaraki, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yugawa
authors.forename: H
authors.initials: H
authors.lastname: Amanuma
mesh_terms: D016475:3T3 Cells; D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D000818:Animals; D001667:Binding, Competitive; D002478:Cells, Cultured; D015752:Genes, env; D009052:Leukemia Virus, Murine / Q000235:genetics*; D051379:Mice; D008811:Mice, Inbred DBA; D008969:Molecular Sequence Data; D009154:Mutation; D011991:Receptors, Virus / Q000378:metabolism; D015682:Retroviridae Proteins, Oncogenic / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D013155:Spleen Focus-Forming Viruses / Q000235:genetics / Q000472:pathogenicity*; D013329:Structure-Activity Relationship; D014162:Transfection; D014759:Viral Envelope Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*
chemical_list: D011991:Receptors, Virus; D015682:Retroviridae Proteins, Oncogenic; D014759:Viral Envelope Proteins; C078780:glycoprotein gp55, Friend spleen focus-forming virus