Fig. 3

Indole production by strains equipped with different TNA enzymes in C1* upon 1 g L−1 Trp supplementation. Samples were taken from duplicate cultures 40 h after inoculation. Means and arithmetic errors of duplicate cultures are shown. Ec: tnaA from E. coli; Hs: tnaA from Histophilus somni; Mi: tnaA from Mageeibacillus indolicus; Ss: tnaA from Synechocystis sp.; Pr: tnaA from Proteiniclasticum ruminis; Cx: tnaA from Corynebacterium xerosis; Eh: tnaA from Escherichia hermannii; Cb: tnaA from Clostridiales bacterium; Pre: tnaA from Providencia rettgeri; Pp: tnaA from Prevotella pallens; Sm: tnaA from Sciscionella marina; Ns: tnaA from Nocardioides sp.; Rs: tnaA from Rhodobacter sphaeroides; Pp: tnaA from Photobacterium sp.; Pv: tnaA from Proteus vulgaris; EV: empty vector pGold