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• W2166636068 abstract "The Escherichia coli Umu proteins play critical roles in damage-inducible SOS mutagenesis. To avoid any gratuitous mutagenesis, the activity of the Umu proteins is normally kept to a minimum by tight transcriptional and posttranslational regulation. We have, however, previously observed that compared with an isogenic recA+ strain, the steady-state levels of the Umu proteins are elevated in a recA730 background (R. Woodgate and D. G. Ennis, Mol. Gen. Genet. 229:10-16, 1991). We have investigated this phenomenon further and find that another coprotease-constitutive (recA*) mutant, a recA432 strain, exhibits a similar phenotype. Analysis revealed that the increased steady-state levels of the Umu proteins in the recA* strains do indeed reflect an in vivo stabilization of the proteins. We have investigated the basis for the phenomenon and find that the mutant RecA* protein stabilizes the Umu proteins by not only converting the labile UmuD protein to the much more stable (and mutagenically active) UmuD' protein but by directly stabilizing UmuD' itself. In contrast, UmuC does not appear to be directly stabilized by RecA* but is instead dramatically stabilized in the presence of UmuD'. On the basis of these observations, we suggest that formation of a UmuD'C-RecA*-DNA quaternary complex protects the UmuD'C proteins from proteolytic degradation and as a consequence helps to promote the switch from error-free to error-prone mechanisms of DNA repair." @default.
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• W2166636068 date "1996-06-01" @default.
• W2166636068 modified "2023-09-27" @default.
• W2166636068 title "In vivo stability of the Umu mutagenesis proteins: a major role for RecA" @default.
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• W2166636068 doi "https://doi.org/10.1128/jb.178.12.3550-3556.1996" @default.
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