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. 1990 Apr;64(4):1675–1682. doi: 10.1128/jvi.64.4.1675-1682.1990

Structural diversity and nuclear protein binding sites in the long terminal repeats of feline leukemia virus.

R Fulton 1, M Plumb 1, L Shield 1, J C Neil 1
PMCID: PMC249304  PMID: 2157050

Abstract

The long terminal repeat U3 sequences were determined for multiple feline leukemia virus proviruses isolated from naturally occurring T-cell tumors. Heterogeneity was evident, even among proviruses cloned from individual tumors. Proviruses with one, two, or three repeats of the long terminal repeat enhancer sequences coexisted in one tumor, while two proviruses with distinct direct repeats were found in another. The enhancer repeats are characteristic of retrovirus variants with accelerated leukemogenic potential and occur between -155 and -244 base pairs relative to the RNA cap site. The termini of the repeats occur at or near sequence features which have been recognized at other retrovirus recombinational junctions. In vitro footprint analysis of the feline leukemia virus enhancer revealed three major nuclear protein binding sites, located at consensus sequences for the simian virus 40 core enhancer, the nuclear factor 1 binding site, and an indirect repeat which is homologous to the PEA2 binding site in the polyomavirus enhancer. Only the simian virus 40 core enhancer sequence is present in all of the enhancer repeats. Cell type differences in binding activities to the three motifs may underlie the selective process which leads to outgrowth of viruses with specific sequence duplications.

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Selected References

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