2.6.1.5 C151Y missense mutation leading to defective folding and likely alteration of the enzymatic activity 676025 2.6.1.5 I249A reduced catalytic activity 673540 2.6.1.5 L273P missense mutation leading to defective folding and likely alteration of the enzymatic activity 676025 2.6.1.5 additional information switch of aspartate aminotransferase to use of tyrosine substrate by introduction of six mutations obtained by rational design and termed HEX plus mutation A293D or mutation I73V 660463 2.6.1.5 N17S increase in Km-values, substantial decrease in kcat-values 660454 2.6.1.5 N54S reduced enzymic activity 660454 2.6.1.5 R20A increase in Km-values, substantial decrease in kcat-values 660454 2.6.1.5 R315K retains enzymic activity 660454 2.6.1.5 R417Q no enzymic activity 660454 2.6.1.5 R41A mutant is inactive when tested with (S)-beta-phenylalanine as amino donor and 2-oxoglutarate as amino acceptor 721359