Fig. 7From: A high-throughput dual system to screen polyphosphate kinase mutants for efficient ATP regeneration in L-theanine biocatalysisApplication of the ATP regeneration platform to produce L-theanine. a Enzymatic synthesis of L-theanine. b Yield of L-theanine produced by enzyme catalysis (400Â mM glutamate, 400Â mM ethylamine and 5Â mM ATP provided)Back to article page