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Reference: Chang F, et al. (2008) Analysis of chromosome III replicators reveals an unusual structure for the ARS318 silencer origin and a conserved WTW sequence within the origin recognition complex binding site. Mol Cell Biol 28(16):5071-81

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Abstract


S. cerevisiae chromosome III encodes 11 autonomously replicating sequence (ARS) elements that function as chromosomal replicators. The essential 11-bp ARS consensus sequence (ACS) that binds the origin recognition complex (ORC) has been experimentally defined for most of these replicators, but not for ARS318 (HMR-I), which is one of the HMR silencers. In this study, we performed a comprehensive linker scan analysis of ARS318. Unexpectedly, this replicator depends on a 9/11 match to the ACS that positions the ORC binding site only 6-bp away from an Abf1p binding site. Although a largely inactive replicator on the chromosome, ARS318 becomes active if the nearby HMR-E silencer is deleted. We also performed a multiple sequence alignment of confirmed replicators on chromosomes III, VI and VII. This analysis revealed a highly conserved "WTW" motif 17-19 bp from the ACS that is functionally important and is apparent in the 228 phylogenetically conserved ARS elements among the six sensu stricto Saccharomyces species.

Reference Type
Journal Article
Authors
Chang F, Theis JF, Miller J, Nieduszynski CA, Newlon CS, Weinreich M
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