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. 1984 Mar 26;12(6):2901–2916. doi: 10.1093/nar/12.6.2901

An enhancer sequence from bovine papilloma virus DNA consists of two essential regions.

H Weiher, M R Botchan
PMCID: PMC318714  PMID: 6324133

Abstract

A comprehensive structural analysis of an enhancer sequence from bovine papilloma virus DNA is presented based on the construction and functional analysis of 20 mutant derivatives. The results, obtained in CV-1 tissue culture cells, show that this enhancer is a small genetic element--only 40 bp in length--that contains two essential regions. The two regions exhibit homology to each other and to DNA fragments from other viral genomes that also act as enhancers in the assay used. However, there is a certain latitude in the sequences that have enhancer activity in CV-1 cells, even within the critical regions. The results are discussed with respect to the model that enhancers are binding sites for tissue specific transcription factors. The formation of Z-DNA might be involved in the enhancement process. However, single base pair transitions in an 8 base pair stretch of alternating purines and pyrimidines within the BPV enhancer which conserve this pattern destroy enhancer function.

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