Redundant cooperative interactions for assembly of a human U6 transcription initiation complex

Ma, B. C., Hernandez, N. (November 2002) Redundant cooperative interactions for assembly of a human U6 transcription initiation complex. Molecular and Cellular Biology, 22 (22). pp. 8067-8078. ISSN 0270-7306

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URL: http://www.ncbi.nlm.nih.gov/pubmed/12391172
DOI: 10.1128/MCB.22.22.8067-8078.2002

Abstract

The core human U6 promoter consists of a proximal sequence element (PSE) located upstream of a TATA box. The PSE is recognized by the snRNA-activating protein complex (SNAPc), which consists of five types of subunits, SNAP190, SNAP50, SNAP45, SNAP43, and SNAP19. The TATA box is recognized by TATA box binding protein (TBP). In addition, basal U6 transcription requires the SANT domain protein Bdp1 and the transcription factor IIB-related factor Brf2. SNAPc and mini-SNAPc, which consists of just SNAP43, SNAP50, and the N-terminal third of SNAP190, bind cooperatively with TBP to the core U6 promoter. By generating complexes smaller than mini-SNAPc, we have identified a 50-amino-acid region within SNAP190 that is (i) required for cooperative binding with TBP in the context of mini-SNAPc and (ii) sufficient for cooperative binding with TBP when fused to a heterologous DNA binding domain. We show that derivatives of mini-SNAPc lacking this region are active for transcription and that with such complexes, TBP can still be recruited to the U6 promoter through cooperative interactions with Brf2. Our results identify complexes smaller than mini-SNAPc that are transcriptionally active and show that there are at least two redundant mechanisms to stably recruit TBP to the U6 transcription initiation complex.

Item Type: Paper
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification
bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > transcription
bioinformatics > genomics and proteomics > genetics & nucleic acid processing
CSHL Authors:
Communities: CSHL labs > Hernandez lab
Depositing User: Matt Covey
Date: November 2002
Date Deposited: 08 Jan 2014 16:20
Last Modified: 08 Jan 2014 16:20
PMCID: PMC134731
Related URLs:
URI: https://repository.cshl.edu/id/eprint/28740

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