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J Virol. 1985 January; 53(1): 100-106

Envelope and long terminal repeat sequences of a cloned infectious NZB xenotropic murine leukemia virus.

ABSTRACT

An infectious NZB xenotropic murine leukemia virus (MuLV) provirus (NZB was molecularly cloned from the Hirt supernatant of NZB-IU-6-infected mink cells, and the nucleotide sequence of its env gene and long terminal repeat (LTR) was determined. The partial nucleotide sequence previously reported for the env gene of NFS-Th-1 xenotropic proviral DNA (Repaske, et al., J. Virol. 46:204-211, 1983) is identical to that of the infectious NZB xenotropic MuLV DNA reported here. Alignment of nucleotide or deduced amino acid sequences, or both, of xenotropic, mink cell focus-forming, and ecotropic MuLV proviral DNAs in the env region identified sequence differences among the three host range classes of C-type MuLVs. Major differences were confined to the 5' half of env; a high degree of homology was found among the three classes of MuLVs in the 3' half of env. Alignment of the nucleotide sequence of the LTR of NZB xenotropic MuLV with those of the LTRs of NFS-Th-1 xenotropic, mink cell focus-forming, and ecotropic MuLVs revealed extensive homology between the LTRs of xenotropic and MCF247 MuLVs. An inserted 6-base-pair repeat 5' to the TATA box was a unique feature of both NZB and NFS-Th-1 xenotropic LTRs.

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