S + S’ ↔ IH k1 and k-1 IH → DS k2 Derive the rate law expression for this reaction employing the preequilibrium approximation. What is the corresponding rate-law expression for the reaction employing the SSA for IH. What conditions gives the same result for the preequilibrium
Catalysis and Enzymatic Reactions
Catalysis is the kind of chemical reaction in which the rate (speed) of a reaction is enhanced by the catalyst which is not consumed during the process of reaction and afterward it is removed when the catalyst is not used to make up the impurity in the product. The enzymatic reaction is the reaction that is catalyzed via enzymes.
Lock And Key Model
The lock-and-key model is used to describe the catalytic enzyme activity, based on the interaction between enzyme and substrate. This model considers the lock as an enzyme and the key as a substrate to explain this model. The concept of how a unique distinct key only can have the access to open a particular lock resembles how the specific substrate can only fit into the particular active site of the enzyme. This is significant in understanding the intermolecular interaction between proteins and plays a vital role in drug interaction.
Consider the formation of double stranded (DS) DNA from two complementary single strands (S and S’) through the following mechanism involving an intermediate helix (IH).
S + S’ ↔ IH k1 and k-1
IH → DS k2
- Derive the rate law expression for this reaction employing the preequilibrium approximation.
- What is the corresponding rate-law expression for the reaction employing the SSA for IH.
- What conditions gives the same result for the preequilibrium approximation and the steady state approximation?
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