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Analysis of γδ resolvase mutants in vitro: Evidence for an interaction between serine-10 of resolvase and site I of res

Hatfull, GF and Grindley, NDF (1986) Analysis of γδ resolvase mutants in vitro: Evidence for an interaction between serine-10 of resolvase and site I of res. Proceedings of the National Academy of Sciences of the United States of America, 83 (15). 5429 - 5433. ISSN 0027-8424

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Abstract

The resolvase encoded by the transposon γδ mediates a site-specific recombination between the two copies of γδ in a cointegrate molecule to yield the final products of transposition. Several mutants of resolvase that lack recombinational activity have been isolated previously, and one of these, which has a serine-to-leucine change at position 10, we have characterized in vitro. We also have constructed a serine-to-cysteine change at position 10 by in vitro mutagenesis and have analyzed this mutant protein in vitro. We find that the cysteine-10 mutant is defective in recombinational activity but binds to the recombinational site, res, similarly to wild-type, as assayed by gel electrophoresis of the protein-DNA complexes. In contrast, the leucine-10 mutant has a specific defect in complex formation with site I, which contains the recombinational crossover point, although it can bind and provide the ancillary functions of resolvase at sites II and III. It has been shown that a phosphoserine linkage is made to the DNA during recombination; because serine-10 is absolutely conserved amongst the family of homologous site-specific recombination proteins, it is a good candidate for the active-site serine. The properties of these resolvase mutants with substitutions at position 10 are consistent with this hypothesis and suggest that serine-10 is in close contact with the DNA at site I.

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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Hatfull, GFgfh@pitt.eduGFH
Grindley, NDF
Date: 1 January 1986
Date Type: Publication
Journal or Publication Title: Proceedings of the National Academy of Sciences of the United States of America
Volume: 83
Number: 15
Page Range: 5429 - 5433
DOI or Unique Handle: 10.1073/pnas.83.15.5429
Schools and Programs: Dietrich School of Arts and Sciences > Biological Sciences
Refereed: Yes
ISSN: 0027-8424
MeSH Headings: Amino Acid Sequence; Binding Sites; Cysteine; DNA Transposable Elements; DNA, Bacterial--genetics; DNA-Binding Proteins--genetics; Methylation; Nucleotidyltransferases--genetics; Recombination, Genetic; Serine; Structure-Activity Relationship; Transposases
Other ID: NLM PMC386300
PubMed Central ID: PMC386300
PubMed ID: 3016704
Date Deposited: 23 Nov 2015 15:17
Last Modified: 02 Feb 2019 15:57
URI: http://d-scholarship.pitt.edu/id/eprint/26313

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