FIG. 4.
Reduction of KO to vitamin K by Mt-VKORH cysteine mutants to support carboxylation in HEK293 cells. Mt-VKORH and its cysteine mutants were transiently expressed in FIXgla-PC/HEK293 cells and the enzymatic activity was determined as described in the legend of Figure 1. The control is transfection of the expression vector into the above cell line. Data are presented as mean±SD (n=3). *p<0.001, compared with control.