Transcriptomics

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361

Tra1 has specific regulatory roles, rather than global functions, within the SAGA coactivator complex


ABSTRACT: The SAGA complex is a conserved, multifunctional coactivator that plays broad roles in eukaryotic transcription. Previous studies suggested that Tra1, the largest SAGA component, is required either for SAGA assembly or for recruitment by DNA-bound transcriptional activators. In contrast to S. cerevisiae and mouse, a tra1? mutant is viable in S. pombe, allowing us to test these issues in vivo. We find that, in a tra1? mutant, SAGA assembles and is recruited to some, but not all promoters. Consistent with these findings, Tra1 regulates the expression of only a subset of SAGA-dependent genes. We previously reported that the SAGA subunits Gcn5 and Spt8 have opposing regulatory roles during S. pombe sexual differentiation. We show here that, like Gcn5, Tra1 represses this pathway, although by a distinct mechanism. Thus, our study reveals that Tra1 has specific regulatory roles, rather than global functions, within SAGA.

ORGANISM(S): Schizosaccharomyces pombe  

SUBMITTER: Jürg Bähler   Fred Winston   Samuel Marguerat   Dominique Helmlinger  

PROVIDER: E-MTAB-678 | ArrayExpress | 2011-06-13

REPOSITORIES: ArrayExpress

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Tra1 has specific regulatory roles, rather than global functions, within the SAGA co-activator complex.

Helmlinger Dominique D   Marguerat Samuel S   Villén Judit J   Swaney Danielle L DL   Gygi Steven P SP   Bähler Jürg J   Winston Fred F  

The EMBO journal 20110603 14


The SAGA complex is a conserved, multifunctional co-activator that has broad roles in eukaryotic transcription. Previous studies suggested that Tra1, the largest SAGA component, is required either for SAGA assembly or for SAGA recruitment by DNA-bound transcriptional activators. In contrast to Saccharomyces cerevisiae and mouse, a tra1Δ mutant is viable in Schizosaccharomyces pombe, allowing us to test these issues in vivo. We find that, in a tra1Δ mutant, SAGA assembles and is recruited to some  ...[more]

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