Koch W, Hunsmann G, Friedrich R
J Virol. 1983 Jan;45(1):1-9. doi: 10.1128/JVI.45.1.1-9.1983.
The envelope gene of the helper-independent, highly leukemogenic virus Friend murine leukemia virus was sequenced by using a molecular clone of a Friend murine leukemia provirus. The deduced amino acid sequences of the envelope proteins gp70 and p15env were homologous to the sequences of Moloney murine leukemia virus (86%) and Akv (76%). However, a stretch of about 40 amino acid residues near the middle of gp70 was dissimilar in Friend and Moloney murine leukemia viruses and Akv. In this type-specific region the gp70s of all three viruses contained more than 30% proline residues, giving this sequence a very rigid conformation. We suggest that this rigid and highly variable region of gp70 participates in infection by recognition of cell surface receptors and, in addition, might contribute to the different oncogenic spectra of murine leukemia viruses.
利用弗氏小鼠白血病前病毒的分子克隆对非依赖辅助病毒、高致白血病性的弗氏小鼠白血病病毒的包膜基因进行了测序。包膜蛋白gp70和p15env推导的氨基酸序列与莫洛尼小鼠白血病病毒(86%)和Akv(76%)的序列同源。然而,gp70中部附近约40个氨基酸残基的一段序列在弗氏和莫洛尼小鼠白血病病毒以及Akv中是不同的。在这个型特异性区域,所有三种病毒的gp70都含有超过30%的脯氨酸残基,使该序列具有非常刚性的构象。我们认为,gp70的这个刚性且高度可变的区域通过识别细胞表面受体参与感染,此外,可能有助于小鼠白血病病毒不同的致癌谱。