Complex mechanism of site-specific DNA replication termination in fission yeast
AUTOR(ES)
Codlin, Sandra
FONTE
Oxford University Press
RESUMO
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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=165654Documentos Relacionados
- Pathway utilization in response to a site-specific DNA double-strand break in fission yeast
- Site-specific recombination of yeast 2-micron DNA in vitro.
- Site-specific ORC binding, pre-replication complex assembly and DNA synthesis at Schizosaccharomyces pombe replication origins
- Chloroplast DNA replication in vitro: site-specific initiation from preferred templates.
- Site-specific initiation of DNA replication in Xenopus egg extract requires nuclear structure.