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• W1991327687 abstract "Ribonucleotide reductase (RNR) is the enzyme critically responsible for the production of the 5′-deoxynucleoside-triphosphates (dNTPs), the direct precursors for DNA synthesis. The dNTP levels are tightly controlled to permit high efficiency and fidelity of DNA synthesis. Much of this control occurs at the level of the RNR by feedback processes, but a detailed understanding of these mechanisms is still lacking. Using a genetic approach in the bacterium Escherichia coli, a paradigm for the class Ia RNRs, we isolated 23 novel RNR mutants displaying elevated mutation rates along with altered dNTP levels. The responsible amino-acid substitutions in RNR reside in three different regions: (i) the (d)ATP-binding activity domain, (ii) a novel region in the small subunit adjacent to the activity domain, and (iii) the dNTP-binding specificity site, several of which are associated with different dNTP pool alterations and different mutational outcomes. These mutants provide new insight into the precise mechanisms by which RNR is regulated and how dNTP pool disturbances resulting from defects in RNR can lead to increased mutation." @default.
• W1991327687 created "2016-06-24" @default.
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• W1991327687 date "2012-05-01" @default.
• W1991327687 modified "2023-10-06" @default.
• W1991327687 title "Novel mutator mutants of E. coli nrdAB ribonucleotide reductase: Insight into allosteric regulation and control of mutation rates" @default.
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• W1991327687 doi "https://doi.org/10.1016/j.dnarep.2012.02.001" @default.
• W1991327687 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3340444" @default.
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