The enhanced mutagenic potential of the MucAB proteins correlates with the highly efficient processing of the MucA protein

DOI Web Site 被引用文献1件
  • J Hauser
    Section on Viruses and Cellular Biology, National Institute of Child Health and Human Development, Bethesda, Maryland.
  • A S Levine
    Section on Viruses and Cellular Biology, National Institute of Child Health and Human Development, Bethesda, Maryland.
  • D G Ennis
    Section on Viruses and Cellular Biology, National Institute of Child Health and Human Development, Bethesda, Maryland.
  • K M Chumakov
    Section on Viruses and Cellular Biology, National Institute of Child Health and Human Development, Bethesda, Maryland.
  • R Woodgate
    Section on Viruses and Cellular Biology, National Institute of Child Health and Human Development, Bethesda, Maryland.

書誌事項

公開日
1992-11
権利情報
  • https://journals.asm.org/non-commercial-tdm-license
DOI
  • 10.1128/jb.174.21.6844-6851.1992
公開者
American Society for Microbiology

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説明

<jats:p>Inducible mutagenesis in Escherichia coli requires the direct action of the chromosomally encoded UmuDC proteins or functional homologs found on certain naturally occurring plasmids. Although structurally similar, the five umu-like operons that have been characterized at the molecular level vary in their ability to enhance cellular and phage mutagenesis; of these operons, the mucAB genes from the N-group plasmid pKM101 are the most efficient at promoting mutagenesis. During the mutagenic process, UmuD is posttranslationally processed to an active form, UmuD'. To explain the more potent mutagenic efficiency of mucAB compared with that of umuDC it has been suggested that unlike UmuD, intact MucA is functional for mutagenesis. To examine this possibility, we have overproduced and purified the MucA protein. Although functionally similar to UmuD, MucA was cleaved much more rapidly both in vitro and in vivo than UmuD. In vivo, restoration of mutagenesis functions to normally nonmutable recA430, recA433, recA435, or recA730 delta(umuDC)595::cat strains by either MucA+ or mutant MucA protein correlated with the appearance of the cleavage product, MucA'. These results suggest that most of the differences in mutagenic phenotype exhibited by MucAB and UmuDC correlate with the efficiency of posttranslational processing of MucA and UmuD rather than an inherent activity of the unprocessed proteins.</jats:p>

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