Vmax
Vmax (or V_max) is a term used in enzyme kinetics to denote the maximum rate of an enzyme-catalyzed reaction. It is the rate of the reaction when the enzyme is saturated with the substrate. The term Vmax is derived from the Michaelis-Menten kinetics, which is a model for the kinetics of a simple enzyme-catalyzed reaction.
Overview[edit | edit source]
Vmax is a measure of the amount of product that can be formed by an enzyme in a given amount of time under saturating conditions of substrate concentration. It is a theoretical maximum rate of reaction, which can only be approached under ideal conditions. The actual rate of an enzyme-catalyzed reaction is usually less than the Vmax because the substrate concentration is not usually high enough to saturate the enzyme.
Calculation[edit | edit source]
Vmax can be calculated from the Michaelis constant (Km) and the enzyme concentration ([E]) using the following equation:
Vmax = kcat[E]
where kcat is the turnover number of the enzyme, which is the maximum number of substrate molecules an enzyme molecule can convert to product per unit time.
Factors affecting Vmax[edit | edit source]
Vmax is affected by several factors including the enzyme concentration, the substrate concentration, the temperature, the pH, and the presence of any inhibitors or activators.
See also[edit | edit source]
References[edit | edit source]
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Contributors: Prab R. Tumpati, MD