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Nucleic Acids Research, 1993, Vol. 21, No. 15 3359-3364
© 1993

MOLECULAR BIOLOGY

An E.coli RuvC mutant defective in cleavage of synthetic Holliday junctions

Gary J. Sharples and Robert G. Lloyd*

Department of Genetics, University of Nottingham, Queens Medical Centre Nottingham NG7 2UH, UK

*To whom correspondence should be addressed

Received May 27, 1993. Revised June 17, 1993. Accepted June 17, 1993.

Escherichia coli RuvC protein is a specific endonuclease that resolves recombination intermediates into viable products. The structural features needed for RuvC activity were investigated by sequencing three ruvC mutations and relating the base pair changes identified to the activity of the mutant proteins. Each of the three mutations is a singie base-pair substitution. ruvC51 converts glycine-15 to an aspartic acid residue. The product of ruvC51 was purified and shown to retain the ability to bind junctions, albeit with a slightly reduced affinity. However, It has lost the ability to resolve these structures by symmetrical cleavage. A multicopy ruvC51 plasmid confers sensitivity to UV light in a ruvC+ strain. The ruvC53 allele causes a glycine-17 to serine substitution while ruvC55 produces a stop codon. Neither of these genes produces a stable product. The results suggest that the N-terminal domain of RuvC may be concerned with cleavage of Junctions.


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