What Protein Does Lipitor Target?
Lipitor (atorvastatin) inhibits HMG-CoA reductase, the enzyme that limits the rate of cholesterol synthesis in the liver. This protein converts HMG-CoA to mevalonate, a key step in the mevalonate pathway.[1]
How Does This Inhibition Lower Cholesterol?
By blocking HMG-CoA reductase, Lipitor reduces intracellular cholesterol production. Liver cells respond by upregulating LDL receptors on their surface, which clear more LDL cholesterol from the blood.[1][2]
Are There Other Proteins Affected?
Lipitor primarily targets HMG-CoA reductase but indirectly influences downstream proteins in the mevalonate pathway, like squalene synthase, and reduces isoprenoid production, affecting proteins such as Ras and Rho that require prenylation for function.[2]
Why Is HMG-CoA Reductase a Common Drug Target?
Statins like Lipitor mimic HMG-CoA and competitively bind the enzyme's active site, a mechanism shared across the class. This selectivity minimizes off-target effects while effectively cutting cholesterol by 20-60%.[1][2]
[1]: DrugPatentWatch.com - Atorvastatin Mechanism
[2]: StatPearls - HMG-CoA Reductase Inhibitors