Transcription factor TFIIB (IPR000812)

Short name: TFIIB

Family relationships


In eukaryotes, transcription initiation by polymerase II is modulated by both general and specific transcription factors. The general factors (which include TFIIA, TFIIB, TFIID, TFIIE, TFIIF, TFIIG and TFIIH) operate through common promoter elements, such as the TATA box. Transcription factor IIB (TFIIB) is of central importance in transcription of class II genes. It associates with TFIID-TFIIA bound to DNA (the DA complex) to form a ternary TFIID-IIA-IBB (DAB) complex, which is recognised by RNA polymerase II [PMID: 1876184, PMID: 1949150]. TFIIB comprises ~315-340 residues and contains an imperfect C-terminal repeat of a 75-residue domain that may contribute to the symmetry of the folded protein.

GO terms

Biological Process

GO:0006352 DNA-templated transcription, initiation
GO:0006355 regulation of transcription, DNA-templated

Molecular Function

GO:0008270 zinc ion binding

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.