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Previous studies from our laboratory have shown that an allele of the heat shock protein GroEL (groEL411) is able to specifically suppress some of the physiological defects of the single-stranded DNA-binding protein mutation ssb-1. A search for additional alleles of the groE genes which may act as suppressors for ssb mutations has led to the identification of groEL46 as a specific suppressor of ssb-113. It has very little or no effect on ssb-1 or ssb-3. All of the physiological defects of ssb-113, including temperature-sensitive growth, temperature-sensitive DNA synthesis, sensitivity to UV irradiation, methyl methanesulfonate, and bleomycin, and reduced recombinational capacity, are restored to wild-type levels. The ssb-113 allele, however, is unable to restore sensitivity of groEL46 cells to phage lambda. The mechanism of suppression of ssb-113 by groEL46 appears to differ from that of ssb-1 by groEL411. The data suggest that GroEL may interact with single-stranded DNA-binding protein in more than one domain.

Interaction of the heat shock protein GroEL of Escherichia coli with single-stranded DNA-binding protein: suppression of ssb-113 by groEL46