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pubmed-article:8416811pubmed:abstractTextBacteriophage 434 repressor recognizes the operator sequences ACAAG and ACAAT. As the same or similar sequences occur in the enhancer region of HIV-1, 434 repressor was a potential HIV enhancer-binding protein. We found that the interaction of the DNA-binding domain of 434 repressor with a 57-bp HIV enhancer DNA was very weak whereas a 42-residue construct, comprising the recognition helix and four copies of a positively charged segment of the repressor, bound strongly. The results of footprint and cell-free in vitro transcription studies showed that the 42-residue peptide bound preferably to the enhancer region of HIV-1 and acted as an artificial repressor. Replacement of an essential glutamine of the recognition helix by glutamic acid resulted in a partial shift of the sequence specificity of the 42-residue peptide.lld:pubmed
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pubmed-article:8416811pubmed:articleTitleThe DNA-binding properties of an artificial 42-residue polypeptide derived from a natural repressor.lld:pubmed
pubmed-article:8416811pubmed:affiliationBiochemisches Institut, Universität Zürich, Switzerland.lld:pubmed
pubmed-article:8416811pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:8416811pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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