from a comparison of the exchange kinetics with the steady-state kinetics of co2 hydration and hco-3 dehydration it is tentatively concluded that the transfer of h+ between active site and medium proceeds with rates of similar magnitudes in the two isoenzymes , whereas the central catalytic step , the interconversion of enzyme-bound co2 and hco-3 , is much slower in isoenzyme i than in isoenzyme ii .
C0014442
enzyme
C0022173
isoenzyme