Mutation spectrum in Escherichia coli DNA mismatch repair deficient (mutH) strain
UMass Chan Affiliations
Department of Biochemistry and Molecular PharmacologyDocument Type
Journal ArticlePublication Date
1987-10-26Keywords
Codon*DNA Repair
DNA Replication
Escherichia coli
*Genes, Bacterial
*Mutation
Tetracycline Resistance
Life Sciences
Medicine and Health Sciences
Metadata
Show full item recordAbstract
The Dam-directed post-replicative mismatch repair system of Escherichia coli removes base pair mismatches from DNA. The products of the mutH, mutL and mutS genes, among others, are required for efficient mismatch repair. Absence of any of these gene products leads to persistence of mismatches in DNA with a resultant increase in spontaneous mutation rate. To determine the specificity of the mismatch repair system in vivo we have isolated and characterized 47 independent mutations from a mutH strain in the plasmid borne mnt repressor gene. The major class of mutations comprises AT to GC transitions that occur within six base pairs of the only two 5'-GATC-3' sequences in the mnt gene. In the wild type control strain, insertion of the IS1 element was the major spontaneous mutational event. A prediction of the Dam-directed mismatch repair model, that the mutation spectra of dam and mutH strains should be the same, was confirmed.Source
Nucleic Acids Res. 1987 Oct 26;15(20):8205-15. Link to article on publisher's websiteDOI
10.1093/nar/15.20.8205Permanent Link to this Item
http://hdl.handle.net/20.500.14038/38881PubMed ID
3313278Related Resources
Link to Article in PubMedae974a485f413a2113503eed53cd6c53
10.1093/nar/15.20.8205