The turnover number A measure of catalytic activity z The kcat is a direct measure of the catalytic production of product under saturating substrate conditions. z kcat, the turnover number, is the maximum number of substrate molecules converted to product per enzyme molecule per unit of time. z According to M-M model, kcat = Vmax/Et z Values of kcat range from less than 1/sec to many millions per secThe turnover number A measure of catalytic activity z The kcat is a direct measure of the catalytic production of product under saturating substrate conditions. z kcat, the turnover number, is the maximum number of substrate molecules converted to product per enzyme molecule per unit of time. z According to M-M model, kcat = Vmax/Et z Values of kcat range from less than 1/sec to many millions per sec