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Pathway Description
Cardiolipin Biosynthesis CL(14:0/20:4(5Z,8Z,11Z,14Z)/14:0/18:1(9Z))
Homo sapiens
Metabolic Pathway
Cardiolipin (CL) is an important component of the inner mitochondrial membrane where it constitutes about 20% of the total lipid composition. It is essential for the optimal function of numerous enzymes that are involved in mitochondrial energy metabolism (Wikipedia). Cardiolipin biosynthesis occurs mainly in the mitochondria, but there also exists an alternative synthesis route for CDP-diacylglycerol that takes place in the endoplasmic reticulum. This second route may supplement this pathway. All membrane-localized enzymes are coloured dark green in the image. First, dihydroxyacetone phosphate (or glycerone phosphate) from glycolysis is used by the cytosolic enzyme glycerol-3-phosphate dehydrogenase [NAD(+)] to synthesize sn-glycerol 3-phosphate. Second, the mitochondrial outer membrane enzyme glycerol-3-phosphate acyltransferase esterifies an acyl-group to the sn-1 position of sn-glycerol 3-phosphate to form 1-acyl-sn-glycerol 3-phosphate (lysophosphatidic acid or LPA). Third, the enzyme 1-acyl-sn-glycerol-3-phosphate acyltransferase converts LPA into phosphatidic acid (PA or 1,2-diacyl-sn-glycerol 3-phosphate) by esterifying an acyl-group to the sn-2 position of the glycerol backbone. PA is then transferred to the inner mitochondrial membrane to continue cardiolipin synthesis. Fourth, magnesium-dependent phosphatidate cytidylyltransferase catalyzes the conversion of PA into CDP-diacylglycerol. Fifth, CDP-diacylglycerol--glycerol-3-phosphate 3-phosphatidyltransferase synthesizes phosphatidylglycerophosphate (PGP). Sixth, phosphatidylglycerophosphatase and protein-tyrosine phosphatase dephosphorylates PGP to form phosphatidylglycerol (PG). Last, cardiolipin synthase catalyzes the synthesis of cardiolipin by transferring a phosphatidyl group from a second CDP-diacylglycerol to PG. It requires a divalent metal cation cofactor.
References
Cardiolipin Biosynthesis CL(14:0/20:4(5Z,8Z,11Z,14Z)/14:0/18:1(9Z)) References
Houtkooper RH, Akbari H, van Lenthe H, Kulik W, Wanders RJ, Frentzen M, Vaz FM: Identification and characterization of human cardiolipin synthase. FEBS Lett. 2006 May 29;580(13):3059-64. doi: 10.1016/j.febslet.2006.04.054. Epub 2006 Apr 27.
Pubmed: 16678169
Prasad SS, Garg A, Agarwal AK: Enzymatic activities of the human AGPAT isoform 3 and isoform 5: localization of AGPAT5 to mitochondria. J Lipid Res. 2011 Mar;52(3):451-62. doi: 10.1194/jlr.M007575. Epub 2010 Dec 20.
Pubmed: 21173190
Tian HF, Feng JM, Wen JF: The evolution of cardiolipin biosynthesis and maturation pathways and its implications for the evolution of eukaryotes. BMC Evol Biol. 2012 Mar 13;12:32. doi: 10.1186/1471-2148-12-32.
Pubmed: 22409430
Chen YQ, Kuo MS, Li S, Bui HH, Peake DA, Sanders PE, Thibodeaux SJ, Chu S, Qian YW, Zhao Y, Bredt DS, Moller DE, Konrad RJ, Beigneux AP, Young SG, Cao G: AGPAT6 is a novel microsomal glycerol-3-phosphate acyltransferase. J Biol Chem. 2008 Apr 11;283(15):10048-57. doi: 10.1074/jbc.M708151200. Epub 2008 Jan 31.
Pubmed: 18238778
Ou X, Ji C, Han X, Zhao X, Li X, Mao Y, Wong LL, Bartlam M, Rao Z: Crystal structures of human glycerol 3-phosphate dehydrogenase 1 (GPD1). J Mol Biol. 2006 Mar 31;357(3):858-69. doi: 10.1016/j.jmb.2005.12.074. Epub 2006 Jan 18.
Pubmed: 16460752
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