2.3.1.167 5.5 - substrates: 10-deacetylbaccatin III, 10-deacetyltaxol 757765 2.3.1.167 6 - optimal pH for mutant enzymes I43S, and I43T and for wild-type enzyme 757640 2.3.1.167 6.5 - optimal pH for mutant enzymes D390H, D390R and I43S/D390R 757640 2.3.1.167 7.4 - - 440288, 486453 2.3.1.167 7.4 - assay at 719235 2.3.1.167 7.4 - recombinant enzymes 660432