Prokaryotic Initiation Factor-2

**Definition:** The largest of the three prokaryotic initiation factors with a molecular size of approximately 80 kD. It functions in the transcription initiation process by promoting the binding of formylmethionine-tRNA to the P-site of the 30S ribosome and by preventing the incorrect binding of elongator tRNA to the translation initiation site.

**Tree numbers:** - D12.776.835.725.934.562

**Synonyms:** - IF2 Protein - infB Gene Product - infB Protein - Initiation Factor-2 - Peptide Initiation Factor 2 - Peptide Initiation Factor IF-2 - Translational Initiation Factor 2