Leukotriene C4 synthase

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Protein LTC4S PDB 2PNO.png
Available structures
PDBOrtholog search: PDBe RCSB
AliasesLTC4S, entrez:4056, Leukotriene C4 synthase
External IDsOMIM: 246530 MGI: 107498 HomoloGene: 7406 GeneCards: LTC4S
Gene location (Human)
Chromosome 5 (human)
Chr.Chromosome 5 (human)[1]
Chromosome 5 (human)
Genomic location for LTC4S
Genomic location for LTC4S
Band5q35.3Start179,793,980 bp[1]
End179,796,647 bp[1]
RefSeq (mRNA)



RefSeq (protein)



Location (UCSC)Chr 5: 179.79 – 179.8 MbChr 11: 50.24 – 50.24 Mb
PubMed search[3][4]
View/Edit HumanView/Edit Mouse

Leukotriene C4 synthase is an enzyme that in humans is encoded by the LTC4S gene.[5][6]

The protein encoded by this gene, LTC4S (or glutathione S-transferase II) is an enzyme that converts leukotriene A4 and glutathione to create leukotriene C4. This is a member of MAPEG family of transmembrane proteins. A trimer of Leukotriene C4 synthase is localized on the outer nuclear membrane and endoplasmic reticulum, where it forms a complex with 5-Lipoxygenase-activating protein. This protein is remotely related to microsomal glutathione S-transferase.


The MAPEG (Membrane-Associated Proteins in Eicosanoid and Glutathione metabolism) family includes a number of human proteins, several of which are involved the production of leukotrienes. This gene encodes an enzyme that catalyzes the first step in the biosynthesis of cysteinyl leukotrienes, potent biological compounds derived from arachidonic acid. Leukotrienes have been implicated as mediators of anaphylaxis and inflammatory conditions such as human bronchial asthma. This protein localizes to the nuclear envelope and adjacent endoplasmic reticulum.[6]

Eicosanoid synthesis. (Leukotrienes at right.)


  1. ^ a b c ENSG00000213316 GRCh38: Ensembl release 89: ENSG00000283887, ENSG00000213316 - Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000020377 - Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ Lam BK, Penrose JF, Freeman GJ, Austen KF (Sep 1994). "Expression cloning of a cDNA for human leukotriene C4 synthase, an integral membrane protein conjugating reduced glutathione to leukotriene A4". Proc Natl Acad Sci U S A. 91 (16): 7663–7. doi:10.1073/pnas.91.16.7663. PMC 44462. PMID 8052639.
  6. ^ a b "Entrez Gene: LTC4S leukotriene C4 synthase".

Further reading[edit]

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