Araki H, Awane K, Irie K, Kaisho Y, Naito A, Oshima Y. A specific host factor binds at a cis-acting transcriptionally silent locus required for stability control of yeast plasmid pSR1.
MOLECULAR & GENERAL GENETICS : MGG 1993;
238:120-8. [PMID:
8479419 DOI:
10.1007/bf00279538]
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Abstract
A cis-acting locus, Z, of plasmid pSR1 functions in stable maintenance of the plasmid in the native host, Zygosaccharomyces rouxii. The Z locus was shown to be located in a 482 bp sequence in the 5' upstream region of an open reading frame, P, by subcloning various DNA fragments in a plasmid replicating via the ARS1 sequence of the Saccharomyces cerevisiae chromosome. Northern analysis revealed that the Z region is not transcribed in either the native host Z. rouxii or the heterologous host S. cerevisiae. The Z region is protected from micrococcal nuclease attack in Z. rouxii but not in S. cerevisiae, its protection depending on the product of the S gene encoded by pSR1. Gel retardation assays suggested that a factor present in nuclear extracts of Z. rouxii cells, irrespective of the presence or absence of a resident pSR1 plasmid, binds to a 111 bp RsaI-SacII sequence in the Z region. These findings suggest that a host protein binds to the Z locus and that the S product interacts with this DNA-protein complex and stabilizes pSR1.
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