title: The microsomal cardiolipin remodeling enzyme acyl-CoA lysocardiolipin acyltransferase is an acyltransferase of multiple anionic lysophospholipids.
abstract: Phospholipids are subjected to remodeling through the Lands cycle to attain appropriate FA compositions. In recent years, at least two families of lysophospholipid acyltransferases have been identified. Acyl-CoA lysocardiolipin acyltransferase 1 (ALCAT1) was initially identified as a microsomal lysocardiolipin acyltransferase. However, the physiological relevance of how this enzyme is involved in cardiolipin remodeling has not been elucidated. We report in this study that ALCAT1 possesses acyltransferase activities toward lysophosphatidylinositol (LPI) and lysophosphatidylglycerol (LPG). Membrane preparations from human embryonic kidney 293 (HEK293) cells overexpressing human ALCAT1 demonstrated significant increases in LPI acyltransferase (LPIAT) and LPG acyltransferase (LPGAT) activities using a variety of fatty acyl-CoAs. The enzyme affinities toward LPI and LPG were determined through kinetic studies suggesting that the LPI binding affinity to ALCAT1 depends on fatty acyl-CoA. Reduced expression of ALCAT1 in Hela cells resulted in significant reductions of LPIAT and LPGAT activities, but not ALCAT activity. Through structural and functional studies, we have identified critical amino acids D168 and L169 within ALCAT1 that are potentially involved in lysophospholipid substrate binding. Our studies provide the molecular basis for future investigations of the physiological function of ALCAT1 and offer evidence of critical amino acids involved in substrate binding for the family of glycerolipid acyltransferases.
authors.affiliation: Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN 46285, USA.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhao
authors.forename: Yan-Qun
authors.initials: YQ
authors.lastname: Chen
authors.forename: Shuyu
authors.initials: S
authors.lastname: Li
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Konrad
authors.forename: Guoqing
authors.initials: G
authors.lastname: Cao
mesh_terms: D051103:1-Acylglycerol-3-Phosphate O-Acyltransferase / Q000235:genetics / Q000378:metabolism*; D000217:Acyltransferases / Q000235:genetics / Q000378:metabolism; D000595:Amino Acid Sequence; D000818:Animals; D000838:Anions / Q000737:chemistry*; D002308:Cardiolipins / Q000378:metabolism*; D002460:Cell Line; D006801:Humans; D008246:Lysophospholipids / Q000737:chemistry*; D051379:Mice; D008861:Microsomes / Q000201:enzymology*; D008969:Molecular Sequence Data; D034741:RNA, Small Interfering / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment; D013379:Substrate Specificity; D014018:Tissue Distribution
chemical_list: D000838:Anions; D002308:Cardiolipins; D008246:Lysophospholipids; D034741:RNA, Small Interfering; D011994:Recombinant Proteins; D000217:Acyltransferases; C496548:LPGAT1 protein, human; C525544:lysocardiolipin acyltransferase, mouse; D051103:1-Acylglycerol-3-Phosphate O-Acyltransferase