Main Reaction: Indole + L-serine >> L-tryptophan

Reference: PubMed ID: 2966157
Authors: Pratt ML, DeMoss JA
Title: Neurospora tryptophan synthase. Characterization of the pyridoxal phosphate binding site.
Published: 1988 May 15

Indole + L-serine --> L-tryptophan