6.4.1.3 A431C kcat (propionyl-CoA) decreased compared to wild-type, Km (propionyl-CoA) increased compared to wild-type. kcat (acetyl-CoA) increased compared to wild-type, Km (propionyl-CoA) similar to wild-type 726557 6.4.1.3 A431D mutant enzyme shows no activity 726557 6.4.1.3 A431I kcat (propionyl-CoA) decreased compared to wild-type, Km (propionyl-CoA) increased compared to wild-type. kcat (acetyl-CoA) increased compared to wild-type, Km (propionyl-CoA) similar to wild-type 726557 6.4.1.3 A431L mutant enzyme shows no activity 726557 6.4.1.3 A487V no effect on activity 652691 6.4.1.3 A497V beta subunit, no effect on subunit interactions and activity 653247 6.4.1.3 A497V polymorphism, 30% higher specific activity than wild-type enzyme 662392 6.4.1.3 A497V significantly increased activity 651459 6.4.1.3 A513_R514insP insertion between residues 513 and 514 of the beta subunit, leads to partial degradation of the subunit, strongly reduced activity 653246 6.4.1.3 A513_R514insP insertion, severe degradation of the subunit 651459