6. Five reaction mixtures containing equal concentrations of an enzyme are made up to the substrate concentrations [S] indicated in the table below and the initial rates of the reaction (V) are measured. The experiment is repeated with an enzyme inhibitor I present at 0.22 mM in each reaction mixture. (a) Determine Km for the substrate and K, for the inhibitor. (b) Can you say anything about the type of the inhibitor? [S], mM V (µmol/min) (no I) V (µmol/min) (+ 0.22 mM I) 0.1 28 17 0.15 36 23 0.2 43 29 0.5 65 50 0.75 74 61
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.
![6. Five reaction mixtures containing equal concentrations of an enzyme are made up to the substrate
concentrations [S] indicated in the table below and the initial rates of the reaction (V) are measured. The
experiment is repeated with an enzyme inhibitor I present at 0.22 mM in each reaction mixture. (a)
Determine Km for the substrate and K, for the inhibitor. (b) Can you say anything about the type of the
inhibitor?
[S], mM
V (µmol/min) (no I)
V (µmol/min) (+ 0.22 mM I)
0.1
28
17
0.15
36
23
0.2
43
29
0.5
65
50
0.75
74
61](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff17f33b7-75ce-4e54-be8c-0e295439ed5e%2Fc160a5eb-ed7b-46f6-8a5d-2ac5ca5bae22%2Fmlnffk9.png&w=3840&q=75)
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