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. 1993 Apr;67(4):2298–2304. doi: 10.1128/jvi.67.4.2298-2304.1993

A protein-binding site with dyad symmetry in the long terminal repeat of the MCF13 murine leukemia virus that contributes to transcriptional activity in T lymphocytes.

F K Yoshimura 1, K Diem 1, H Chen 1, J Tupper 1
PMCID: PMC240375  PMID: 8383242

Abstract

We have previously identified regions in the long terminal repeat (LTR) of the MCF13 murine leukemia virus (MLV) that contribute to transcriptional activity in different cell types. We have observed that enhancer sequences and a region that resides 3' of the enhancer make significant contributions to transcriptional activity in T lymphocytes (T. Hollon and F. K. Yoshimura, J. Virol. 63:3353-3361, 1989). In this report, we have focused on the region of the MCF13 LTR that is 3' of the enhancer to identify binding sites for proteins that may play a role in the regulation of transcription in T cells. By gel shift and DNA footprint analyses, we have identified a single protein-binding site (MLPal) that includes a nucleotide sequence with dyad symmetry. A synthetic double-stranded oligonucleotide corresponding to this protein-binding site formed a specific protein-DNA complex. Deletion of this protein-binding site from the wild-type LTR decreased transcriptional activity in T lymphocytes but not in fibroblasts as determined by a transient expression assay. The MLPal sequence by itself cannot augment transcription in T cells but is able to do so in conjunction with enhancer sequences.

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Selected References

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