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• W2066179156 abstract "Helicases are transferred to replication origins by helicase loading factors. The Escherichia coli DnaC and eukaryotic Cdc6/18 helicase loaders contain ATP sites and are both members of the AAA+ family. One might expect that ATP is required for helicase loading; however, this study on DnaC illustrates that ATP is not actually needed for DnaC to load helicase onto single-strand DNA (ssDNA). In fact, it seems to be a paradox that after transfer of helicase to DNA, DnaC-ATP inhibits helicase action. In addition, ATP is required for DnaC function at an early step in oriC replication in which ATP stimulates ssDNA binding by DnaC, leading to expansion of the ssDNA bubble at the origin. Two cofactors, ssDNA and DnaB, trigger hydrolysis of ATP, converting DnaC to the ADP form that no longer inhibits DnaB. These observations have led to the idea that DnaC is a 'dual' switch protein, where both the ATP and the ADP forms are sequentially required for replication. This dual switching process may underlie the sensitivity of DnaB to even small fluctuations in DnaC levels." @default.
• W2066179156 created "2016-06-24" @default.
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• W2066179156 date "2002-06-17" @default.
• W2066179156 modified "2023-10-16" @default.
• W2066179156 title "The DnaC helicase loader is a dual ATP/ADP switch protein" @default.
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• W2066179156 doi "https://doi.org/10.1093/emboj/cdf308" @default.
• W2066179156 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/126063" @default.
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