NADPH inhibits glucose-6-phosphate dehydrogenase. What kind of inhibitor is NADPH?

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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7. Glucose-6-phosphate dehydrogenase catalyzes the reaction shown below. Kinetic data
for the enzyme isolated from the thermophilic bacterium T. maritima are presented in the
following table.
CH₂OPO
H
но
CH₂OPO
OH H
H
OH
Н
OH
Glucose-6-phosphate
Substrate
NADP+
NAD+
NADP+
Glucose-6-phosphate
NADPH + H+
glucose-6-
phosphate
dehydrogenase
H
12.0
НО
H
OH H
Η
OH
6-Phosphoglucono-8-lactone
KM (mM) Vmax (Umg-¹)
0.15 20
0.03
20
6
a. NADPH inhibits glucose-6-phosphate dehydrogenase. What kind of inhibitor is
NADPH?
b. How are the values of KM and Vmax likely to differ from those listed in the table if
NADPH is present?
c. Does glucose-6-phosphate dehydrogenase prefer NAD+ or NADP+ as a
cofactor?
Transcribed Image Text:7. Glucose-6-phosphate dehydrogenase catalyzes the reaction shown below. Kinetic data for the enzyme isolated from the thermophilic bacterium T. maritima are presented in the following table. CH₂OPO H но CH₂OPO OH H H OH Н OH Glucose-6-phosphate Substrate NADP+ NAD+ NADP+ Glucose-6-phosphate NADPH + H+ glucose-6- phosphate dehydrogenase H 12.0 НО H OH H Η OH 6-Phosphoglucono-8-lactone KM (mM) Vmax (Umg-¹) 0.15 20 0.03 20 6 a. NADPH inhibits glucose-6-phosphate dehydrogenase. What kind of inhibitor is NADPH? b. How are the values of KM and Vmax likely to differ from those listed in the table if NADPH is present? c. Does glucose-6-phosphate dehydrogenase prefer NAD+ or NADP+ as a cofactor?
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