3-Hydroxyacyl-CoA dehydratase

Identifiers
EC no.	4.2.1.134
Databases
IntEnz	IntEnz view
BRENDA	BRENDA entry
ExPASy	NiceZyme view
KEGG	KEGG entry
MetaCyc	metabolic pathway
PRIAM	profile
PDB structures	RCSB PDB PDBe PDBsum
Search PMC articles PubMed articles NCBI proteins

3-Hydroxyacyl-CoA dehydratases (HACDs) are a family of enzymes that play a crucial role in fatty acid elongation in eukaryotes. These enzymes catalyze the third step in the four-step cycle of fatty acid elongation, specifically the dehydration reaction that converts 3-hydroxyacyl-CoA to trans-2-enoyl-CoA. In humans, there are four known HACD enzymes (HACD1-4) encoded by separate genes. These enzymes are primarily involved in the biosynthesis of very long-chain fatty acids (VLCFAs), which are essential components of various cellular structures and signaling molecules. HACDs are localized in the endoplasmic reticulum membrane, where they work in concert with other enzymes of the fatty acid elongation complex to produce fatty acids with chain lengths greater than 16 carbon atom.