- #1
Zealduke
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Suicide substrate. An Enzyme, E reacts with a substrate S to form an enzyme substrate-complex, ES is usual for Michaelis-Menten kinetics. However, the substrate in the enzyme-substrate complex chemically reacts with the enzyme to form a permanent covalent complex at the enzyme active site. The enzyme then becomes ED (dead enzyme). ED is no longer active and it does not turn over.
The reaction shceme is
E+S--> (k1) and <--- (k-1) ES---> (k2) ED
In this case [ET] -[ED]=[E] +[ES], where [ET] is the initial starting concentration of enzyme, [ED] is the concentration of dead enzyme,and [E] and [ES] are the concentration of viable enzyme that are respectively free and substrate bound.
Using the steady state approximation for [ES], as you would in the usual Michaelis-Menten scheme, derive an expression for the rate of creation of [ED]. That is, find d[ED]/dt. (Hint, your expression will contain the term {[ET]-[ED]} instead of the usual [ET]. Your expression also contains k1, k-1, k2)
I doubt I'm right on this...
d[ES]/dt = k1[E] - [ES](k-1 + k2)
d[ED]/dt = k2 [ES]
= k1([ET]-[ES]) - [ES](k-1 + k2)
Am I at least on the right track? If not I have a couple ideas to alternative solutions.
The reaction shceme is
E+S--> (k1) and <--- (k-1) ES---> (k2) ED
In this case [ET] -[ED]=[E] +[ES], where [ET] is the initial starting concentration of enzyme, [ED] is the concentration of dead enzyme,and [E] and [ES] are the concentration of viable enzyme that are respectively free and substrate bound.
Using the steady state approximation for [ES], as you would in the usual Michaelis-Menten scheme, derive an expression for the rate of creation of [ED]. That is, find d[ED]/dt. (Hint, your expression will contain the term {[ET]-[ED]} instead of the usual [ET]. Your expression also contains k1, k-1, k2)
I doubt I'm right on this...
d[ES]/dt = k1[E]
d[ED]/dt = k2 [ES]
= k1
Am I at least on the right track? If not I have a couple ideas to alternative solutions.