Biology:Leukotriene C4 synthase

Short description: Protein-coding gene in the species Homo sapiens

Generic protein structure example

Leukotriene C4 synthase is an enzyme that in humans is encoded by the LTC4S gene.

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.

Eicosanoid synthesis. (Leukotrienes at right.)

Further reading

• Penrose JF (1999). "LTC4 synthase. Enzymology, biochemistry, and molecular characterization". Clinical Reviews in Allergy & Immunology 17 (1–2): 133–52. doi:10.1007/BF02737601. PMID 10436863. 
• "The biochemical, molecular, and genomic aspects of leukotriene C4 synthase". Proc. Assoc. Am. Physicians 111 (6): 537–46. 2000. doi:10.1046/j.1525-1381.1999.99212.x. PMID 10591082. 
• "Membrane-associated proteins in eicosanoid and glutathione metabolism (MAPEG). A widespread protein superfamily". Am. J. Respir. Crit. Care Med. 161 (2 Pt 2): S20–4. 2000. doi:10.1164/ajrccm.161.supplement_1.ltta-5. PMID 10673221. 
• Bigby TD (2000). "The leukotriene C(4) synthase gene and asthma". Am. J. Respir. Cell Mol. Biol. 23 (3): 273–6. doi:10.1165/ajrcmb.23.3.f197. PMID 10970815. 
• "Purification of human leukotriene C4 synthase". Proc. Natl. Acad. Sci. U.S.A. 89 (23): 11603–6. 1993. doi:10.1073/pnas.89.23.11603. PMID 1454853. 
• "Human leukotriene C4 synthase expression in dimethyl sulfoxide-differentiated U937 cells". J. Biol. Chem. 267 (25): 17849–57. 1992. doi:10.1016/S0021-9258(19)37121-2. PMID 1517222. 
• "Purification of human lung leukotriene C4 synthase and preparation of a polyclonal antibody". Am. J. Respir. Crit. Care Med. 152 (1): 283–9. 1995. doi:10.1164/ajrccm.152.1.7599836. PMID 7599836. 
• "Protein-protein interaction affinity chromatography of leukotriene C4 synthase". Protein Expr. Purif. 6 (3): 352–6. 1995. doi:10.1006/prep.1995.1046. PMID 7663172. 
• "Molecular cloning and expression of human leukotriene-C4 synthase". Proc. Natl. Acad. Sci. U.S.A. 91 (21): 9745–9. 1994. doi:10.1073/pnas.91.21.9745. PMID 7937884. Bibcode: 1994PNAS...91.9745W. 
• "Purification to homogeneity and the N-terminal sequence of human leukotriene C4 synthase: a homodimeric glutathione S-transferase composed of 18-kDa subunits". Proc. Natl. Acad. Sci. U.S.A. 90 (5): 2015–9. 1993. doi:10.1073/pnas.90.5.2015. PMID 8446623. Bibcode: 1993PNAS...90.2015N. 
• "Molecular cloning of the gene for human leukotriene C4 synthase. Organization, nucleotide sequence, and chromosomal localization to 5q35". J. Biol. Chem. 271 (19): 11356–61. 1996. doi:10.1074/jbc.271.19.11356. PMID 8626689. 
• "Molecular cloning of the human leukotriene C4 synthase gene and assignment to chromosome 5q35". Mol. Med. 2 (5): 637–46. 1997. doi:10.1007/BF03401647. PMID 8898379. 
• "Production of leukotriene C4 in different human tissues is attributable to distinct membrane bound biosynthetic enzymes". J. Biol. Chem. 272 (15): 10182–7. 1997. doi:10.1074/jbc.272.15.10182. PMID 9092565. 
• "Pharmacological modulation of human platelet leukotriene C4-synthase". Biochem. Pharmacol. 53 (6): 905–8. 1997. doi:10.1016/S0006-2952(96)00819-2. PMID 9113110. 
• "5-Lipoxygenase expression in Langerhans cells of normal human epidermis". Proc. Natl. Acad. Sci. U.S.A. 95 (2): 663–8. 1998. doi:10.1073/pnas.95.2.663. PMID 9435249. Bibcode: 1998PNAS...95..663S. 

External links

• leukotriene-C4+synthase at the US National Library of Medicine Medical Subject Headings (MeSH)
• UMich Orientation of Proteins in Membranes families/superfamily-199 - Eicosanoid and Glutathione metabolism protein family (MAPEG)