MsmK affects fermentation of different carbohydrates in <i>S</i>. <i>suis</i>.

a glucose used as the positive control b the mutant cannot utilize the carbohydrate any more compared with the parental strain. c no substrate added in reaction system, used as the negative control. d fermentation result is positive, the strain could utilize the carbohydrate for acid production. e fermentation result is negative, the strain couldn’t utilize the carbohydrate for acid production. MsmK affects fermentation of different carbohydrates in S. suis.