Conversion of l-leucine by CE of P. freudenreichii TL 34 (A) and ITGP23 (B) in 60 mM phosphate (pH 6.8) containing 5 mM l-leucine, 10 mM α-KG, 50 μM PLP, and 50 μM TPP at 30°C. Symbols: ▴, leucine; ◊, α-ketoisocaproic acid (K-iC6); •, glutamic acid; ○, α-KG.