PMID:9683467
| Citation |
Li, S and Waters, R (1998) Escherichia coli strains lacking protein HU are UV sensitive due to a role for HU in homologous recombination. J. Bacteriol. 180:3750-6 |
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| Abstract |
hupA and hupB encode the alpha and beta subunits of the Escherichia coli histone-like protein HU. Here we show that E. coli hup mutants are sensitive to UV in the rec+ sbc+, recBC sbcA, recBC sbcBC, umuDC, recF, and recD backgrounds. However, hupAB mutations do not enhance the UV sensitivity of resolvase-deficient recG ruvA strains. hupAB uvrA and hupAB recG strains are supersensitive to UV. hup mutations enhance the UV sensitivity of ruvA strains to a much lesser extent but enhance that of rus-1 ruvA strains to the same extent as for rus+ ruv+ strains. Our results suggest that HU plays a role in recombinational DNA repair that is not specifically limited to double-strand break repair or daughter strand gap repair; the lack of HU affects the RecG RusA and RuvABC pathways for Holliday junction processing equally if the two pathways are equally active in recombinational repair; the function of HU is not in the substrate processing step or in the RecFOR-directed synapsis action during recombinational repair. Furthermore, the UV sensitivity of hup mutants cannot be suppressed by overexpression of wild-type or mutant gyrB, which confers novobiocin resistance, or by different concentrations of a gyrase inhibitor that can increase or decrease the supercoiling of chromosomal DNA. |
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| Keywords |
Bacterial Outer Membrane Proteins/genetics; Bacterial Outer Membrane Proteins/metabolism; Bacterial Proteins/genetics; Carrier Proteins/genetics; Carrier Proteins/metabolism; DNA-Binding Proteins/genetics; DNA-Binding Proteins/metabolism; Dose-Response Relationship, Radiation; Escherichia coli/drug effects; Escherichia coli/genetics; Escherichia coli/radiation effects; Escherichia coli Proteins; Genetic Markers; Genotype; Mutation; Novobiocin/pharmacology; Recombination, Genetic; Topoisomerase II Inhibitors; Ultraviolet Rays |
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