Molecular characterization of a phospholipase D generating anandamide and its congeners.
Anandamide (N-arachidonoylethanolamine) is known to be an endogenous ligand of cannabinoid and vanilloid receptors. Its congeners (collectively referred to as N-acylethanolamines) also show a variety of biological activities. These compounds are principally formed from their corresponding N-acyl-phosphatidylethanolamines by a phosphodiesterase of the phospholipase D-type in animal tissues. We purified the enzyme from rat heart, and by the use of the sequences of its internal peptides cloned its complementary DNAs from mouse, rat, and human. The deduced amino acid sequences were composed of 393-396 residues, and showed that the enzyme has no homology with the known phospholipase D enzymes but is classified as a member of the zinc metallohydrolase family of the beta-lactamase fold. As was overexpressed in COS-7 cells, the recombinant enzyme generated anandamide and other N-acylethanolamines from their corresponding N-acyl-phosphatidylethanolamines at comparable rates. In contrast, the enzyme was inactive with phosphatidylcholine and phosphatidylethanolamine. Assays of the enzyme activity and the messenger RNA and protein levels revealed its wide distribution in murine organs with higher contents in the brain, kidney, and testis. These results confirm that a specific phospholipase D is responsible for the generation of N-acylethanolamines including anandamide, strongly suggesting the physiological importance of lipid molecules of this class.
Okamoto
Yasuo
Y
Department of Biochemistry, Kagawa University School of Medicine, 1750-1 Ikenobe, Miki, Kagawa 761-0793, Japan.
Morishita
Jun
J
Tsuboi
Kazuhito
K
Tonai
Takeharu
T
Ueda
Natsuo
N
D000595:Amino Acid Sequence; D000818:Animals; D001095:Arachidonic Acids / Q000494:pharmacology*; D015153:Blotting, Western; D001921:Brain / Q000378:metabolism; D019556:COS Cells; D002121:Calcium Channel Blockers / Q000494:pharmacology; D002384:Catalysis; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000378:metabolism; D063388:Endocannabinoids; D004983:Ethanolamines / Q000737:chemistry; D006801:Humans; D007668:Kidney / Q000378:metabolism; D008024:Ligands; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D009206:Myocardium / Q000201:enzymology; D010713:Phosphatidylcholines / Q000737:chemistry; D010714:Phosphatidylethanolamines / Q000737:chemistry; D010739:Phospholipase D / Q000737:chemistry*; D053284:Polyunsaturated Alkamides; D017510:Protein Folding; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D011994:Recombinant Proteins / Q000737:chemistry; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid; D013737:Testis / Q000378:metabolism; D014018:Tissue Distribution; D001618:beta-Lactamases / Q000737:chemistry
D001095:Arachidonic Acids; D002121:Calcium Channel Blockers; D018076:DNA, Complementary; D063388:Endocannabinoids; D004983:Ethanolamines; D008024:Ligands; C022203:N-acylethanolamines; D010713:Phosphatidylcholines; D010714:Phosphatidylethanolamines; D053284:Polyunsaturated Alkamides; D012333:RNA, Messenger; D011994:Recombinant Proteins; C527163:Napepld protein, rat; D010739:Phospholipase D; D001618:beta-Lactamases; C078814:anandamide