Spn1 Regulates the Recruitment of Spt6 and the Swi/Snf Complex during Transcriptional Activation by RNA Polymerase II
| Autor: | Aaron G. L. Fletcher, Lei Zhang, Vanessa Cheung, Laurie A. Stargell, Fred Winston |
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| Rok vydání: | 2008 |
| Předmět: |
Transcriptional Activation
Saccharomyces cerevisiae Proteins Time Factors Transcription Genetic Chromosomal Proteins Non-Histone cells Protein subunit genetic processes Mutant RNA polymerase II macromolecular substances Saccharomyces cerevisiae Gene Expression Regulation Fungal Histone Chaperones Nuclear protein Promoter Regions Genetic Molecular Biology Gene Transcription factor biology SWI/SNF complex Cytochromes c Nuclear Proteins Articles Cell Biology Molecular biology enzymes and coenzymes (carbohydrates) Protein Subunits Phenotype biology.protein Mutant Proteins RNA Polymerase II biological phenomena cell phenomena and immunity Transcriptional Elongation Factors TATA-binding protein Gene Deletion Protein Binding Transcription Factors |
| Zdroj: | Molecular and Cellular Biology. 28:1393-1403 |
| ISSN: | 1098-5549 |
| DOI: | 10.1128/mcb.01733-07 |
| Popis: | We investigated the timing of the recruitment of Spn1 and its partner, Spt6, to the CYC1 gene. Like TATA binding protein and RNA polymerase II (RNAPII), Spn1 is constitutively recruited to the CYC1 promoter, although levels of transcription from this gene, which is regulated postrecruitment of RNAPII, are low. In contrast, Spt6 appears only after growth in conditions in which the gene is highly transcribed. Spn1 recruitment is via interaction with RNAPII, since an spn1 mutant defective for interaction with RNAPII is not targeted to the promoter, and Spn1 is necessary for Spt6 recruitment. Through a targeted genetic screen, strong and specific antagonizing interactions between SPN1 and genes encoding Swi/Snf subunits were identified. Like Spt6, Swi/Snf appears at CYC1 only after activation of the gene. However, Spt6 significantly precedes Swi/Snf occupancy at the promoter. In the absence of Spn1 recruitment, Swi/Snf is constitutively found at the promoter. These observations support a model whereby Spn1 negatively regulates RNAPII transcriptional activity by inhibiting recruitment of Swi/Snf to the CYC1 promoter, and this inhibition is abrogated by the Spn1-Spt6 interaction. These findings link Spn1 functions to the transition from an inactive to an actively transcribing RNAPII complex at a postrecruitment-regulated promoter. |
| Databáze: | OpenAIRE |
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