Leukotriene C4 synthase

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

LTC4S
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 4JRZ, 2PNO, 2UUH, 2UUI, 3B29, 3HKK, 3LEO, 3PCV, 4J7T, 4J7Y, 4JC7, 4JCZ, 5HV9, 4WAB
Identifiers
Aliases	LTC4S, entrez:4056, Leukotriene C4 synthase
External IDs	OMIM: 246530; MGI: 107498; HomoloGene: 7406; GeneCards: LTC4S; OMA:LTC4S - orthologs
Gene location (Human) Chr. Chromosome 5 (human)[1] Band 5q35.3 Start 179,793,980 bp[1] End 179,796,647 bp[1]
Gene location (Mouse) Chr. Chromosome 11 (mouse)[2] Band 11|11 B1.3 Start 50,127,288 bp[2] End 50,129,443 bp[2]
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in right uterine tube testicle apex of heart right coronary artery left uterine tube right auricle of heart left coronary artery right adrenal cortex olfactory zone of nasal mucosa right hemisphere of cerebellum Top expressed in choroid plexus of fourth ventricle lactiferous gland white adipose tissue subcutaneous adipose tissue brown adipose tissue stroma of bone marrow right kidney embryo primary oocyte Epithelium of choroid plexus More reference expression data BioGPS n/a
Gene ontology Molecular function leukotriene-C4 synthase activity glutathione peroxidase activity protein binding lyase activity enzyme activator activity lipid binding identical protein binding glutathione transferase activity Cellular component integral component of membrane membrane nuclear envelope endoplasmic reticulum nuclear outer membrane nucleus intracellular membrane-bounded organelle endoplasmic reticulum membrane Biological process positive regulation of catalytic activity leukotriene biosynthetic process cellular oxidant detoxification leukotriene metabolic process long-chain fatty acid biosynthetic process lipoxygenase pathway lipoxin biosynthetic process Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 4056 17001 Ensembl ENSG00000283887 ENSG00000213316 ENSMUSG00000020377 UniProt Q16873 Q60860 RefSeq (mRNA) NM_145867 NM_000897 NM_008521 NM_001313968 RefSeq (protein) NP_665874 NP_001300897 NP_032547 Location (UCSC) Chr 5: 179.79 – 179.8 Mb Chr 11: 50.13 – 50.13 Mb PubMed search [3] [4]
Wikidata
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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.

Function

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.)