... Site-specific mutagenesis of the alpha subunit of tryptophan synthase from Salmonella typhimurium Changing arginine 179 to leucine alters the reciprocal transmission of substrateinduced conformational ... scheme of the tryptophan synthase reaction General General scheme of the tryptophan synthase reaction Indole, which is formed from IGP by the α-subunits is channelled to β-subunits, which synthesize ... Frey M, Gierl A, Niks D, Dunn MF, Schlichting I: On the structural basis of the catalytic mechanism and the regulation of the alpha subunit of tryptophan synthase from Salmonella typhimurium and...