passages.id: split_5_test_3433_passage
passages.type: progene_text
passages.text: The catalytic efficiency ( kcat / Km ) of the mutant D405N was 1.7 x 10(4) M(-1) s(-1) , markedly decreased compared with that of the wild - type ApB ( 6.2 x 10(5) M(-1) s(-1) ) .