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. 1985 Apr;162(1):72–77. doi: 10.1128/jb.162.1.72-77.1985

Copy mutant of mini-Rts1: lowered binding affinity of mutated RepA protein to direct repeats.

Y Terawaki, Y Itoh
PMCID: PMC218955  PMID: 3156849

Abstract

Nucleotide sequence analysis of mini-Rts1 and its copy mutant disclosed the presence of two clusters of direct-repeat sequences flanking the coding region for the 33,000-dalton RepA protein and two base substitutions on the mini-Rts1cop1 genome (Kamio et al., J. Bacteriol. 158:307-312, 1984). On subcloning of the left cluster (incI) that is located downstream from repA, the five 24-base-pair repeats expressed a stronger incompatibility toward mini-Rts1 than did the four repeats. The right cluster (incII) that contains three 21-base-pair repeats also exhibited strong incompatibility toward mini-Rts1. By separating the two base substitutions of mini-Rts1cop1, the mutation that is responsible for the copy increase was determined to be a single base change in the RepA coding region. Both clusters of the repeats, cloned separately into the vector plasmid, showed a weaker incompatibility toward mini-Rts1cop1 than to the wild-type mini-Rts1. These findings suggest a lowered binding affinity of the mutated RepA protein to the direct repeats.

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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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