DNA-directed RNA Polymerase

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

**Definition:** An enzyme that catalyzes the stepwise addition of ribonucleotides to the 3' end of a growing RNA chain using a single-stranded DNA template. This reaction, transcription, is important in the flow of information from DNA to proteins. Three different polymerase protein complexes have been identified and characterized.

**Synonyms:** - DNA-Dependent RNA Polymerase - EC 2.7.7.6