4.3.1.2 C361A kcat (mesaconate) decreased compared to wild-type, Km (mesaconate) increased compared to wild-type. Conversion 2h: 47% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 95:5 (89:11 wild-type) 729745 4.3.1.2 C361K mutant shows no reactivity. Conversion 2h: 10% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 95:5 (89:11 wild-type) 729745 4.3.1.2 F170A kcat (mesaconate) decreased compared to wild-type, Km (mesaconate) increased compared to wild-type. Conversion 2h: 63% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 95:5 (89:11 wild-type) 729745 4.3.1.2 H194A enhanced diastereoselectivities 703197 4.3.1.2 K331A enhanced diastereoselectivities 703197 4.3.1.2 L384A kcat (mesaconate) decreased compared to wild-type, Km (mesaconate) increased compared to wild-type. Conversion 2h: 61% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 95:5 (89:11 wild-type) 729745 4.3.1.2 L384A mutant displays pronounced amination activity towards 2-hexylfumarate ad decreased amination activity towards mesaconate compared to wild-type. Mutant displays a broad electrophile scope including fumarate derivatives with alkyl, aryl, alkoxy, aryloxy, alkylthio and arylthio substituents at the C2 position 730442 4.3.1.2 Q172A kcat (mesaconate) decreased compared to wild-type, Km (mesaconate) increased compared to wild-type. Conversion 2h: 16% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 95:5 (89:11 wild-type) 729745 4.3.1.2 Q172N mutant shows no reactivity. Conversion 2h: 6% (73% wild-type), diastereomeric product ratio (threo:erythro) after 2h: 95:5 (89:11 wild-type) 729745 4.3.1.2 Q329A enhanced diastereoselectivities 703197