4ROC

Human TFIIB-related factor 2 (Brf2) and TBP bound to U6#2 promoter

Summary for 4ROC

• Entry DOI: 10.2210/pdb4roc/pdb
• Related: 4ROC 4ROD 4ROE
• Descriptor: Transcription factor IIIB 50 kDa subunit, TATA-box-binding protein, Template strand, ... (6 entities in total)
• Functional Keywords: transcription factor, transcription
• Biological source: Homo sapiens (human); More
• Cellular location: Nucleus : Q9HAW0 P20226
• Total number of polymer chains: 4
• Total formula weight: 78033.29

Authors

Vannini, A.,Gouge, J.,Satia, K.,Guthertz, N. (deposition date: 2014-10-28, release date: 2015-12-30, Last modification date: 2023-09-20)

Primary citation

Gouge, J.,Satia, K.,Guthertz, N.,Widya, M.,Thompson, A.J.,Cousin, P.,Dergai, O.,Hernandez, N.,Vannini, A.
Redox Signaling by the RNA Polymerase III TFIIB-Related Factor Brf2.
Cell(Cambridge,Mass.), 163:1375-1387, 2015

PubMed Abstract: TFIIB-related factor 2 (Brf2) is a member of the family of TFIIB-like core transcription factors. Brf2 recruits RNA polymerase (Pol) III to type III gene-external promoters, including the U6 spliceosomal RNA and selenocysteine tRNA genes. Found only in vertebrates, Brf2 has been linked to tumorigenesis but the underlying mechanisms remain elusive. We have solved crystal structures of a human Brf2-TBP complex bound to natural promoters, obtaining a detailed view of the molecular interactions occurring at Brf2-dependent Pol III promoters and highlighting the general structural and functional conservation of human Pol II and Pol III pre-initiation complexes. Surprisingly, our structural and functional studies unravel a Brf2 redox-sensing module capable of specifically regulating Pol III transcriptional output in living cells. Furthermore, we establish Brf2 as a central redox-sensing transcription factor involved in the oxidative stress pathway and provide a mechanistic model for Brf2 genetic activation in lung and breast cancer.

PubMed: 26638071
DOI: 10.1016/j.cell.2015.11.005

Experimental method

X-RAY DIFFRACTION (1.9 Å)