Upstream Stimulatory Factor 1

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

**Definition:** Upstream stimulatory factor 1 (310 aa, ~34 kDa) is encoded by the human USF1 gene. This protein plays a role in the positive regulation of gene transcription.

**Synonyms:** - Class B Basic Helix-Loop-Helix Protein 11 - Major Late Transcription Factor - Major Late Transcription Factor 1 - USF1 - bHLHb11