A Single-Stranded Region Located Downstream of the Repeated Sequence in the ori Region of pSC101 Is Required for Binding of the Rep Protein In Vitro

Purified replication initiator protein (Rep) of plasmid pSClOl binds preferentially to two inverted repeats (IR) overlapping the promoter of its own structure gene, rep. However, the protein has much lower binding affinity for directly repeated (DR) sequences in the replication origin (ori) that are...

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Bibliographic Details
Published in:Journal of biochemistry (Tokyo) 1991-11, Vol.110 (5), p.775-779
Main Authors: Fueki, Tsukasa, Yamaguchi, Kazuo
Format: Article
Language:English
Subjects:
Adenosine Triphosphatases - genetics
Bacterial Proteins - genetics
Base Sequence
Binding, Competitive
Biological and medical sciences
DNA Helicases
DNA Replication
DNA, Single-Stranded - chemistry
Exodeoxyribonucleases - genetics
Fundamental and applied biological sciences. Psychology
Molecular and cellular biology
Molecular genetics
Molecular Sequence Data
Nucleic Acid Conformation
Plasmids
Protein Binding
Repetitive Sequences, Nucleic Acid
Replication
Replicon
Sequence Homology, Nucleic Acid
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Summary:Purified replication initiator protein (Rep) of plasmid pSClOl binds preferentially to two inverted repeats (IR) overlapping the promoter of its own structure gene, rep. However, the protein has much lower binding affinity for directly repeated (DR) sequences in the replication origin (ori) that are similar to the symmetric sequences. Exonuclease III (exo III) promotes in vitro binding of Rep to the origin repeats. In the present studies, DNA containing the DR sequences was degraded unidirectionally by exo III and then formed a complex with Rep. Analyses of DNA from the complex revealed that Rep bound to the DR sequences only when the degradation proceeded from the 3' end proximal to IR to the DR sequences, resulting in conversion of the duplex structure in a specific downstream region of DR into the single-stranded form. The degradation in the opposite direction had no effect on binding of Rep. These results suggest that a localized structural change of DNA adjacent to DR is required for Rep binding to double-stranded DR sequences. By contrast, exo III strikingly inhibited binding of Rep to DNA containing the IR sequences by introducing a single-stranded moiety into duplex IR sequences.
ISSN:0021-924X
1756-2651
DOI:10.1093/oxfordjournals.jbchem.a123658