Abstract
The enzymes of the acyl-coenzyme A: cholesterol acyltransferase (ACAT) family are responsible for the in vivo synthesis of neutral lipids. They are potential drug targets for the intervention of atherosclerosis, hyperlipidemia, obesity, type II diabetes and even Alzheimer’s disease. ACAT family enzymes are integral endoplasmic reticulum (ER) membrane proteins and can be divided into ACAT branch and acyl-coenzyme A: diacylglycerol acyltransferase 1 (DGAT1) branch according to their substrate specificity. The ACAT branch catalyzes synthesis of cholesteryl esters using long-chain fatty acyl-coenzyme A and cholesterol as substrates, while the DGAT1 branch catalyzes synthesis of triacylglycerols using fatty acylcoenzyme A and diacylglycerol as substrates. In this review, we mainly focus on the recent progress in the structural research of ACAT family enzymes, including their disulfide linkage, membrane topology, subunit interaction and catalysis mechanism.
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