(a) The kinetic data given below are for the reaction catalyzed by prostaglandin endoperoxide synthase. Focusing here on the first two columns, determine the Vmax and Km of the enzyme. [Arachidonic acid] Rate of formation of PGG₂ (MM) (mm/min) 0.5 1.0 1.5 2.5 3.5 23.5 32.2 36.9 41.8 44.0 Rate of formation of PGG₂ with 10 mg/mL ibuprofen (mm/min) 16.67 25.25 30.49 37.04 38.91 (b) Ibuprofen is an inhibitor of prostaglandin endoperoxide synthase. By inhibiting the synthesis of prostaglandins, ibuprofen reduces inflammation and pain. Using the data in the first and third columns of the table, determine the type of inhibition that ibuprofen exerts on prostaglandin endoperoxide synthase using a Lineweaver-Burke PLOT.

Biochemistry
6th Edition
ISBN:9781305577206
Author:Reginald H. Garrett, Charles M. Grisham
Publisher:Reginald H. Garrett, Charles M. Grisham
Chapter25: Nitrogen Acquisition And Amino Acid Metabolism
Section: Chapter Questions
Problem 12P
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5. Properties of an Enzyme of Prostaglandin Synthesis Prostaglandins are
a class of eicosanoids, fatty acid derivatives with a variety of extremely
potent actions on vertebrate tissues. They are responsible for producing
fever and inflammation and its associated pain. Prostaglandins are derived
from the 20-carbon fatty acid arachidonic acid in a reaction catalyzed by
the enzyme prostaglandin endoperoxide synthase. This enzyme, a
cyclooxygenase, uses oxygen to convert arachidonic acid to PGG2, the
immediate precursor of many different prostaglandins (prostaglandin
synthesis is described in Chapter 21).
(a) The kinetic data given below are for the reaction catalyzed by
prostaglandin endoperoxide synthase. Focusing here on the first two
columns, determine the Vmax and Km of the enzyme.
[Arachidonic acid] Rate of formation of PGG₂
(MM)
(mm/min)
0.5
1.0
1.5
2.5
3.5
23.5
32.2
36.9
41.8
44.0
Rate of formation of PGG₂
with 10 mg/mL ibuprofen
(mm/min)
16.67
25.25
30.49
37.04
38.91
(b) Ibuprofen is an inhibitor of prostaglandin endoperoxide synthase. By
inhibiting the synthesis of prostaglandins, ibuprofen reduces inflammation
and pain. Using the data in the first and third columns of the table,
determine the type of inhibition that ibuprofen exerts on prostaglandin
endoperoxide synthase using a Lineweaver-Burke PLOT.
Transcribed Image Text:5. Properties of an Enzyme of Prostaglandin Synthesis Prostaglandins are a class of eicosanoids, fatty acid derivatives with a variety of extremely potent actions on vertebrate tissues. They are responsible for producing fever and inflammation and its associated pain. Prostaglandins are derived from the 20-carbon fatty acid arachidonic acid in a reaction catalyzed by the enzyme prostaglandin endoperoxide synthase. This enzyme, a cyclooxygenase, uses oxygen to convert arachidonic acid to PGG2, the immediate precursor of many different prostaglandins (prostaglandin synthesis is described in Chapter 21). (a) The kinetic data given below are for the reaction catalyzed by prostaglandin endoperoxide synthase. Focusing here on the first two columns, determine the Vmax and Km of the enzyme. [Arachidonic acid] Rate of formation of PGG₂ (MM) (mm/min) 0.5 1.0 1.5 2.5 3.5 23.5 32.2 36.9 41.8 44.0 Rate of formation of PGG₂ with 10 mg/mL ibuprofen (mm/min) 16.67 25.25 30.49 37.04 38.91 (b) Ibuprofen is an inhibitor of prostaglandin endoperoxide synthase. By inhibiting the synthesis of prostaglandins, ibuprofen reduces inflammation and pain. Using the data in the first and third columns of the table, determine the type of inhibition that ibuprofen exerts on prostaglandin endoperoxide synthase using a Lineweaver-Burke PLOT.
[S]
[S] mM
0.5
1
1.5
2.5
3.5
mM/min
23.5
32.2
36.9
41.8
44
w/ibu
mM/min
16.67
25.25
30.39
37.04
38.91
1/[S]
1/Vo
w/ibu
1/Vo
Transcribed Image Text:[S] [S] mM 0.5 1 1.5 2.5 3.5 mM/min 23.5 32.2 36.9 41.8 44 w/ibu mM/min 16.67 25.25 30.39 37.04 38.91 1/[S] 1/Vo w/ibu 1/Vo
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