Allen sandbox 1: Difference between revisions
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Enolase is in the alpha and beta proteins class and has a fold of TIM beta/alpha-barrel. It comes from the Superfamily on Enolase C-terminal domain-like and is in the enolase family. | Enolase is in the alpha and beta proteins class and has a fold of TIM beta/alpha-barrel. It comes from the Superfamily on Enolase C-terminal domain-like and is in the enolase family. | ||
==Mechanism== | ==Mechanism== | ||
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[[Image:enolase kinetics.jpeg|left|150px|V vs. [PGA]; PGA is 2PG, the top curve has [Mg2+] of 10^-3 M and the bottom curve has [Mg2+] of 106-2 M]]<ref>{{journal2}}</ref> | [[Image:enolase kinetics.jpeg|left|150px|V vs. [PGA]; PGA is 2PG, the top curve has [Mg2+] of 10^-3 M and the bottom curve has [Mg2+] of 106-2 M]]<ref>{{journal2}}</ref> | ||
Since Mg2+ is essential for binding the substrate, 2-PG, it is also needed at a specific quantity in order to have a sufficient reaction velocity. This graph shows the Velocity vs. [PGA], in which PGA is 2-PG, at two different concentrations of Mg2+. The upper curve (Mg2+ concentration of 10^-3 M) attains a greater Vmax than the lower curve (Mg2+ concentration of 10^-2 M)<ref>{{journal2}}</ref>. The Km of upper curve is also larger than the lower curve, which means a greater concentration of substrate is needed to attain the higher Vmax. Therefore, the lower Mg2+ concentration (upper curve) is more desirable. Clearly, upon addition of Mg2+, the reaction velocity is lowered to sub-optimum levels, thereby inhibiting the activity of enolase. | Since Mg2+ is essential for binding the substrate, 2-PG, it is also needed at a specific quantity in order to have a sufficient reaction velocity. This graph shows the Velocity vs. [PGA], in which PGA is 2-PG, at two different concentrations of Mg2+. The upper curve (Mg2+ concentration of 10^-3 M) attains a greater Vmax than the lower curve (Mg2+ concentration of 10^-2 M)<ref>{{journal2}}</ref>. The Km of upper curve is also larger than the lower curve, which means a greater concentration of substrate is needed to attain the higher Vmax. Therefore, the lower Mg2+ concentration (upper curve) is more desirable. Clearly, upon addition of Mg2+, the reaction velocity is lowered to sub-optimum levels, thereby inhibiting the activity of enolase. | ||
