Reaction: a very-long-chain fatty acyl-CoA + a sphingoid base = a very-long-chain ceramide + CoA
Glossary: a sphingoid base = an amino alcohol, composed predominantly of 18 carbon atoms, characterized by the presence of a hydroxyl group at C-1 (and often also at C-3), and an amine group at C-2.
Other name(s): sphingoid base N-very-long-chain fatty acyl-coA transferase; mammalian ceramide synthase 2; CERS3 (gene name); LASS3 (gene name); LAG1 (gene name); LAC1 (gene name); LOH1 (gene name); LOH3 (gene name)
Systematic name: very-long-chain fatty acyl-CoA:sphingoid base N-acyltransferase
Comments: This entry describes ceramide synthase enzymes that are specific for very-long-chain fatty acyl-CoA substrates. The two isoforms from yeast and the plant LOH1 and LOH3 isoforms transfer 24:0 and 26:0 acyl chains preferentially and use phytosphingosine as the preferred sphingoid base. The mammalian CERS2 isoform is specific for acyl donors of 20-26 carbons, which can be saturated or unsaturated. The mammalian CERS3 isoform catalyses this activity, but has a broader substrate range and also catalyses the activity of EC 18.104.22.1688, ultra-long-chain ceramide synthase. Both mammalian enzymes can use multiple sphingoid bases, including sphinganine, sphingosine, and phytosphingosine.
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