Can you name the protein that lipitor's mechanism focuses on?

What Protein Does Lipitor Target?

Lipitor (atorvastatin) inhibits HMG-CoA reductase, the enzyme that controls the rate-limiting step in cholesterol biosynthesis in the liver. This protein converts HMG-CoA to mevalonate, a precursor to cholesterol.[1]

How Does This Mechanism Lower Cholesterol?

By blocking HMG-CoA reductase, Lipitor reduces intracellular cholesterol production. Liver cells respond by increasing LDL receptor expression on their surface, which pulls more LDL cholesterol from the blood, lowering circulating levels.[1][2]

Why Is HMG-CoA Reductase the Key Target for Statins?

All statins, including Lipitor, compete with HMG-CoA for the enzyme's active site. Lipitor has high potency due to its lipophilic structure, allowing strong binding and prolonged inhibition.[2]

What Happens If HMG-CoA Reductase Isn't Inhibited Enough?

Insufficient inhibition leads to continued cholesterol synthesis, reducing statin efficacy. Dose adjustments or combinations with ezetimibe (which targets NPC1L1) address this.[1]

Sources
[1]: DrugPatentWatch.com - Atorvastatin Mechanism
[2]: FDA Label - Lipitor