ZHANG Pengpai, HU Sheng, MEI Lehe, et al. A triple mutant improving activity of cytochrome P450 BM-3 to catalyze indole hydroxylation:D168L/E435T/V445A[J]. CIESC Journal, 2014, (4): 1374-1380.
ZHANG Pengpai, HU Sheng, MEI Lehe, et al. A triple mutant improving activity of cytochrome P450 BM-3 to catalyze indole hydroxylation:D168L/E435T/V445A[J]. CIESC Journal, 2014, (4): 1374-1380.DOI: 10.3969/j.issn.0438-1157.2014.04.030.
To further enhance hydroxylation ability with indole of P450 BM-3
site-directed mutagenesis with V445A was introduced to the mutant D168L/E435T obtained in earlier research
and mutant D168L/E435T/V445A was obtained. Compared with D168L/E435T and V445A
mutant D168L/E435T/V445A exhibited lower affinity with indole
but higher improved turnover rate (kcat). Correspondingly
catalytic efficiency (kcatKm-1) was increased to 1.53 times and 1.47 times respectively. The electronic coupling rate of the mutant was also improved by 24.7%
39.5% higher than that of D168L/E435T and 64.7% higher than that of V445A
showing better efficiency of electronic utilization of this new mutant enzyme. Mutant D168L/E435T/V445A also displayed improved regioselectivity with indole in indigo synthesis
with the proportion of by-product indirubin 41.7% of that of D168L/E435T and 30.6% of that of V445A.