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- W2565773396 abstract "Genome-wide analyses of S. cerevisiae replisome mobility reveal overlapping roles of Pif1 and Rrm3 helicases in alleviating replication-fork arrest at tRNA genes. Saccharomyces cerevisiae expresses two Pif1-family helicases—Pif1 and Rrm3—which have been reported to play distinct roles in numerous nuclear processes. Here, we systematically characterized the roles of Pif1 helicases in replisome progression and lagging-strand synthesis in S. cerevisiae. We demonstrate that either Pif1 or Rrm3 redundantly stimulates strand displacement by DNA polymerase δ during lagging-strand synthesis. By analyzing replisome mobility in pif1 and rrm3 mutants, we show that Rrm3, with a partially redundant contribution from Pif1, suppresses widespread terminal arrest of the replisome at tRNA genes. Although both head-on and codirectional collisions induce replication-fork arrest at tRNA genes, head-on collisions arrest a higher proportion of replisomes. In agreement with this observation, we found that head-on collisions between tRNA transcription and replication are under-represented in the S. cerevisiae genome. We demonstrate that tRNA-mediated arrest is R-loop independent and propose that replisome arrest and DNA damage are mechanistically separable." @default.
- W2565773396 created "2017-01-06" @default.
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- W2565773396 date "2016-12-19" @default.
- W2565773396 modified "2023-09-27" @default.
- W2565773396 title "Pif1-family helicases cooperatively suppress widespread replication-fork arrest at tRNA genes" @default.
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- W2565773396 doi "https://doi.org/10.1038/nsmb.3342" @default.
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- W2565773396 hasPublicationYear "2016" @default.
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