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Regulation of Mutagenic DNA Polymerase V Activation in Space and Time


Escherichia coli, and many other bacteria, respond to high levels of DNA damage with an inducible system called the SOS response. In this response, bacteria first try to restart replication using non-mutagenic DNA repair strategies. If that fails, replication can be restored using DNA polymerases that simply replicate over DNA lesions, a desperation strategy that results in mutations. DNA polymerase V (pol V) is responsible for most mutagenesis that accompanies the SOS response. Because of the risk inherent to elevated mutation levels, pol V activation is tightly constrained. This report introduces a new layer of regulation on pol V activation, with a novel spatial component. After synthesis, the UmuC subunit of pol V is sequestered transiently at the membrane. Release into the cytosol and final activation depends on the activity of RecA protein and the autocatalytic cleavage of UmuD to generate the UmuD' subunit of pol V. The resulting delay in activation represents an additional molecular mechanism that limits the amount of time that this sometimes necessary but potentially detrimental enzyme spends on the DNA.


Vyšlo v časopise: Regulation of Mutagenic DNA Polymerase V Activation in Space and Time. PLoS Genet 11(8): e32767. doi:10.1371/journal.pgen.1005482
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1005482

Souhrn

Escherichia coli, and many other bacteria, respond to high levels of DNA damage with an inducible system called the SOS response. In this response, bacteria first try to restart replication using non-mutagenic DNA repair strategies. If that fails, replication can be restored using DNA polymerases that simply replicate over DNA lesions, a desperation strategy that results in mutations. DNA polymerase V (pol V) is responsible for most mutagenesis that accompanies the SOS response. Because of the risk inherent to elevated mutation levels, pol V activation is tightly constrained. This report introduces a new layer of regulation on pol V activation, with a novel spatial component. After synthesis, the UmuC subunit of pol V is sequestered transiently at the membrane. Release into the cytosol and final activation depends on the activity of RecA protein and the autocatalytic cleavage of UmuD to generate the UmuD' subunit of pol V. The resulting delay in activation represents an additional molecular mechanism that limits the amount of time that this sometimes necessary but potentially detrimental enzyme spends on the DNA.


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