IUBMB Enzyme Nomenclature


Accepted name: ω-hydroxyceramide transacylase

Reaction: a linoleate-containing triacyl-sn-glycerol + an ultra-long-chain ω-hydroxyceramide = a diacyl-sn-glycerol + a linoleate-esterified acylceramide

Glossary: an ultra-long-chain fatty acid = ULCFA = a fatty acid with aliphatic chain of 28 or more carbons
an ultra-long-chain ω-hydroxyceramide = a ceramide that contains an ultra-long-chain ω-hydroxyfatty acid moiety (C28-C36)
acylceramide = ω-O-acylceramide = a ceramide that contains an ultra-long-chain ω-hydroxyfatty acid moiety (C28-C36) that is further extended by ω-esterification with linoleic acid.

Other name(s): PNPLA1 (gene name)

Systematic name: triacyl-sn-glycerol:ultra-long-chain ω-hydroxyceramide ω-O-linoleoyltransferase

Comments: The enzyme participates in the production of acylceramides in the stratum corneum, the outermost layer of the epidermis. Acylceramides are crucial components of the skin permeability barrier.

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:


1. Ohno, Y., Kamiyama, N., Nakamichi, S. and Kihara, A. PNPLA1 is a transacylase essential for the generation of the skin barrier lipid ω-O-acylceramide. Nat. Commun. 8 (2017) 14610. [PMID: 28248318]

[EC created 2019]

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