L-tryptophan biosynthesis PMID:6822478 PMID:2679363 PMID:7773017 UPa:UPA00035 (S)-alpha-amino-beta-(3-indolyl)-propionic acid biosynthesis PMID:7890741 2-amino-3-(1H-indol-3-yl)propanoic acid biosynthesis PMID:16794934 KEGG:map00910 Biosynthesis of the aromatic amino-acid L-tryptophan (Trp) from chorismate. This pathway is present in bacteria, fungi and plants. L-tryptophan is needed to synthesize proteins and, as a precursor, to nicotinic acid (niacin), serotonin and melatonin. PMID:11806827 KEGG:map00330 KEGG:map01100 KEGG:map00471 KEGG:map00250 KEGG:map01120 pathway PMID:881418 KEGG:map00402 KEGG:map00400 MetaCyc:TRPSYN-PWY PMID:7556082 KEGG:map01110 GO:0000162 tryptophan metabolism amino-acid biosynthesis proteinogenic amino-acid biosynthesis aromatic amino-acid biosynthesis