The metabolic
pathway that produces cholesterol and other isoprenoids is known as the
mevalonate pathway. The rate-controlling enzyme of this pathway is
3-hydroxy-3-methyl-glutaryl-CoA reductase or HMG-CoA reductase (HMGCR). This
rate-controlling step in the biosynthesis of isoprenoids and sterols can berestricted by the use of statins.
This step
involves the four-electron reductive deacylation of HMGCoA to CoA and
mevalonate. It is catalyzed by HMGR in a reaction that proceeds as follows:
(S) HMG CoA + 2
NADPH + 2 H+ ⇒ (R)
Mevalonate + 2
NADP+ + CoASH
Where NADP+ is
the oxidized form of nicotinamide adenine dinucelotide, NADPH is the reduced
form of NADP+, and CoASH is the reduced form of CoA. One specific intervention
for the use of HMG-CoA reductase inhibitors or statins is the potent effect on
cholesterol. Read more...............
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