Conversion of Indolylglycerol Phosphate into Tryptophan by Extracts of Pisum

Abstract
Dialyzed extracts from sterile and nonsterile pea seedlings perform the synthesis of tryptophan from indole‐3‐glycerol‐1‐phosphate (IGP) and L‐serine. Compared with the analogous indole methabolism, there are similar dependences with regard to pH and to serine and pyridoxal‐5‐phosphate requirements, but the IGP conversion rate only amounts to one third of that measured for indole. Indole‐3‐glycerol is not metabolized by both tissues and homogenates.