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Journal of Bacteriology, August 1998, p. 3750-3756, Vol. 180, No. 15
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Escherichia coli Strains Lacking Protein HU Are UV Sensitive due to a Role for HU in Homologous Recombination

Shisheng Li and Raymond Waters*

School of Biological Sciences, University of Wales Swansea, Swansea SA2 8PP, United Kingdom

Received 13 June 1997/Accepted 15 May 1998

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.

* Corresponding author. Mailing address: School of Biological Sciences, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, United Kingdom. Phone: (44) 1792 295384. Fax: (44) 1792 295447. E-mail: r.waters{at}swansea.ac.uk.

Journal of Bacteriology, August 1998, p. 3750-3756, Vol. 180, No. 15
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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