Acetylcholinesterase is a
serine hydrolase with a reported catalytic constant greater than 104 s−1. This implies that this enzyme reacts with acetylcholine at close to the diffusion-limited rate. Carbonic anhydrase is one of the fastest enzymes, and its rate is typically limited by the
diffusion rate of its
substrates. Typical catalytic constants for the different forms of this enzyme range between 104 s−1 and 106 s−1. ==See also==