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. 1991 Nov 25;19(22):6255–6262. doi: 10.1093/nar/19.22.6255

Analysis of the interactions of functional domains of a nuclear origin of replication from Saccharomyces cerevisiae.

S S Walker 1, A K Malik 1, S Eisenberg 1
PMCID: PMC329136  PMID: 1956786

Abstract

We have determined that ARS121 is an efficient origin of replication on chromosome X of Saccharomyces cerevisiae. This origin is comprised of at least three distinct functional domains. One of these domains is the ARS121 core sequence (approximately 35 bp-long), which is essential for origin activity. This essential core contains an 11 bp sequence resembling (2 bp mismatch) the ARS consensus. Another important domain is an enhancer of DNA replication, which binds the OBF1 protein. The third domain, ATR (A/T-rich, approximately 72 bp), is auxiliary and works in either orientation, but only when located 3' to the essential core. When fused to the ARS121 core both the enhancer and the ATR domain act synergistically to enhance the activity of the origin. Furthermore, when fused to the essential core sequences of heterologous ARSs, ARS1 and ARS307, the auxiliary domains also appeared to stimulate synergistically origin function. These results suggest that (i) in order to elicit maximal origin activity all three domains have to interact and (ii) activation of the essential core sequences at different origins of replication may share a common mechanism.

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Selected References

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