Elucidation of the Mechanism of Polysaccharide Cleavage by Chondroitin AC Lyase from <i>Flavobacterium </i><i>h</i><i>eparinum</i>
作者:Carl S. Rye、Stephen G. Withers
DOI:10.1021/ja020627c
日期:2002.8.1
enzyme has allowed the measurement of defined and reproducible k(cat) and K(m) values and has expanded the range of mechanistic studies that can be performed. The primary deuterium kinetic isotope effect upon k(cat)/K(m) for the abstraction of the proton alpha to the carboxylic acid was measured to be 1.67 +/- 0.07, showing that deprotonation occurs in a rate-limiting step. Using substrates with leaving