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Counterselection of GATC sequences in enterobacteriophages by the components of the methyl-directed mismatch repair system

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Summary

Weak to severe deficit of GATC sequences in the DNA of enterobacteriophages appears to be correlated with their undermethylation during growth indam + (GATC ade-methylase) bacteria. This observation is corroborated by the sequence analysis showing no evidence for site-specific mutagenicity of 6meAde. The MutH protein of the methyl-directed mismatch repair system recognizes and cleaves the undermethylated GATC sequences in the course of mismatch repair. To enquire whether the MutH function of the methyldirected mismatch repair system participates in counterselection of GATC sequences in enterobacteriophages, we have studied the yield of bacteriophage ϕX174 containing either 0, 1, or 2 GATC sequences, in wild type,dam, andmut (H, L, S, U) Escherichia coli. Following transfection with unmethylated DNA containing two GATC sequences, a net decrease in the yield of infective particles was observed in all bacterialmutH + dam− strains, whereas no detectable decrease was observed in bacteria infected by DNA without GATC sequence. This effect of the MutH function is maximum in wild type andmutL andmutS bacteria whereas the effect is not significant inmutU bacteria, suggesting an interaction of the, helicase II with the MutH protein.

However, indam + bacteria, the presence of GATC sequences leads to an increased yield of infective particles. The effect of GATC sequence and its Dam methylation system on phage yield inmutH − bacteria reveals that methylated GATC sequences are advantageous to the phage. These results suggest that the methyl-directed mismatch repair system, and in particular its MutH protein, may have participated in severe counterselection of GATC sequences from enterobacteriophages, presumably, by DNA cleavage or by interfering with DNA replication or packaging when GATC sequences are undermethylated. Coevolution of the Dam and MutH proteins could then account for the loss of GATC sequences from DNA of bacteriophages growing indam + hosts.

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  1. Laboratoire de Mutagénèse, Institut J. Monod, 2 place Jussieu, 75251, Paris Cedex 05, France

    Patrick Deschavanne & Miroslav Radman

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  1. Patrick Deschavanne
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  2. Miroslav Radman
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Deschavanne, P., Radman, M. Counterselection of GATC sequences in enterobacteriophages by the components of the methyl-directed mismatch repair system. J Mol Evol 33, 125–132 (1991). https://doi.org/10.1007/BF02193626

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  • DOI: https://doi.org/10.1007/BF02193626

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