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Protein activity analysis indicated that ImuA had no DNA binding activity, but inhibited the DNA binding and recombinase activity of RecA1. These findings indicate the new role of ImuA in SOS mutagenesis, that is, ImuA inhibits the recombinase activity of RecA1, thereby facilitating SOS mutagenesis in M. xanthus. Importance DnaE2 is responsible for bacterial SOS mutagenesis in nearly one-third of sequenced bacterial strains. However, its mechanism, especially the function of its accessory protein ImuA, is still unclear. Here we reported that M. xanthus ImuA
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