TFIIIB

**Semantic type:** Amino Acid, Peptide, or Protein

**Definition:** The RNA polymerase III initiation factor TFIIIB is assembled onto DNA through interactions involving the Tfc4 subunit of the assembly factor TFIIIC and two subunits of TFIIIB, Brf1 and Bdp1.

**Synonyms:** - B-TFIID - Transcription Factor IIIB