The HML mating-type cassette of Saccharomyces cerevisiae is regulated by two separate but functionally equivalent silencers.

Abstract:

:Mating-type genes resident in the silent cassette HML at the left arm of chromosome III are repressed by the action of four SIR gene products, most likely mediated through two cis-acting sites located on opposite sides of the locus. We showed that deletion of either of these two cis-acting sites from the chromosome did not yield any detectable derepression of HML, while deletion of both sites yielded full expression of the locus. In addition, each of these sites was capable of exerting repression of heterologous genes inserted in their vicinity. Thus, HML expression is regulated by two independent silencers, each fully competent for maintaining repression. This situation was distinct from the organization of the other silent locus, HMR, at which a single silencer served as the predominant repressor of expression. Examination of identifiable domains and binding sites within the HML silencers suggested that silencing activity can be achieved by a variety of combinations of various functional domains.

journal_name

Mol Cell Biol

authors

Mahoney DJ,Broach JR

doi

10.1128/mcb.9.11.4621

subject

Has Abstract

pub_date

1989-11-01 00:00:00

pages

4621-30

issue

11

eissn

0270-7306

issn

1098-5549

journal_volume

9

pub_type

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