Complex mechanism of site-specific DNA replication termination in fission yeast

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Abstract

A site-specific replication terminator, RTS1, is present at the Schizosaccharomyces pombe mating-type locus mat1. RTS1 regulates the direction of replication at mat1, optimizing mating-type switching that occurs as a replication-coupled recombination event. Here we show that RTS1 contains two cis-acting sequences that cooperate for efficient replication termination. First, a sequence of ∼450 bp containing four repeated 55 bp motifs is essential for function. Secondly, a purine-rich sequence of ∼60 bp without intrinsic activity, located proximal to the repeats, acts cooperatively to increase barrier activity 4-fold. Our data suggest that the trans-acting factors rtf1p and rtf2p act through the repeated motifs and the purine-rich element, respectively. Thus, efficient site-specific replication termination at RTS1 occurs by a complex mechanism involving several cis-acting sequences and trans-acting factors. Interestingly, RTS1 displays similarities to mammalian rDNA replication barriers.

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Codlin, S., & Dalgaard, J. Z. (2003). Complex mechanism of site-specific DNA replication termination in fission yeast. EMBO Journal, 22(13), 3431–3440. https://doi.org/10.1093/emboj/cdg330

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