Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/11315
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Type: Journal article
Title: DNA binding by the coliphage 186 repressor protein C1
Author: Dodd, I.
Egan, J.
Citation: Journal of Biological Chemistry, 1996; 271(19):11532-11540
Publisher: AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
Issue Date: 1996
ISSN: 0021-9258
1083-351X
Abstract: The cI gene of coliphage 186 maintains lysogeny and confers immunity to 186 infection by repressing the major early promoter, p(R), and the promoter for the late transcription activator gene, p(B). Gel mobility shirt and DNase I footprinting show that CI protein binds to the DNA at p(R) and p(B) and also to sites approximately 300 base pairs upstream and downstream of p(R), called FL and FR. Mutations which cause virulence reduce CI binding to p(R). The biochemical and genetic data identify three CI operators at p(R), two at p(B), and single operators at FL and FR. The operators at the p(B), FL, FR, and central p(R) sites are inverted repeat sequences, separated by 5 base pairs (Type A) or, in the case of p(R), by 4 base pairs (Type A'). A different inverted repeat operator sequence (Type B) is proposed for the binding sites on each side of the central site at p(R). Thus, CI appears to recognize two distinct DNA sequences. CI binds cooperatively to adjacent operators, and binding at p(R) is strongly dependent on these cooperative interactions. A high order CI multimer appears to be the active DNA binding species, even at single operators.
Keywords: Escherichia coli; Coliphages; Deoxyribonuclease I; DNA-Binding Proteins; Repressor Proteins; Viral Proteins; DNA Primers; DNA Footprinting; Polymerase Chain Reaction; Lysogeny; Base Composition; Binding Sites; Amino Acid Sequence; Base Sequence; Repetitive Sequences, Nucleic Acid; Consensus Sequence; Kinetics; Genes, Fungal; Plasmids; Molecular Sequence Data; Viral Regulatory and Accessory Proteins; Promoter Regions, Genetic
RMID: 0030004390
DOI: 10.1074/jbc.271.19.11532
Appears in Collections:Biochemistry publications

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