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. 1985 Aug;5(8):1959–1968. doi: 10.1128/mcb.5.8.1959

Alternate utilization of two regulatory domains within the Moloney murine sarcoma virus long terminal repeat.

B J Graves, S P Eisenberg, D M Coen, S L McKnight
PMCID: PMC366913  PMID: 3018540

Abstract

The Moloney murine sarcoma virus long terminal repeat (LTR) harbors two distinct positive activators of transcription, namely, a distal signal and an enhancer. In this report we demonstrate that infection by herpes simplex virus (HSV) can markedly affect the utilization of these two Moloney murine sarcoma virus transcription signals. We investigated the HSV-mediated trans-acting effects with two goals in mind: first, to gain insight into LTR function, and second, to probe the mechanisms used by HSV to establish its own transcription cascade. In mock-infected cells, LTR-mediated expression was heavily dependent on the Moloney murine sarcoma virus enhancer but was effectively distal signal independent. HSV infection mobilized the use of the LTR distal signal and concomitantly alleviated enhancer dependence. Indeed, enhancer function may actually be inhibited by HSV trans-acting factors. These results suggest that the two positive control signals of the Moloney murine sarcoma virus LTR facilitate transcriptional activation by two different pathways. We further observed that the identity of the structural gene driven by the LRT, as well as the state of integration of a transfected template, can exert a substantial effect on the response of a template to HSV infection. According to these findings, we propose a tentative model to account for the initial temporal shift of the HSV transcriptional cascade.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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