Identification of endogenous acyl amino acids based on a targeted lipidomics approach.
Using a partially purified bovine brain extract, our lab identified three novel endogenous acyl amino acids in mammalian tissues. The presence of numerous amino acids in the body and their ability to form amides with several saturated and unsaturated fatty acids indicated the potential existence of a large number of heretofore unidentified acyl amino acids. Reports of several additional acyl amino acids that activate G-protein coupled receptors (e.g., N-arachidonoyl glycine, N-arachidonoyl serine) and transient receptor potential channels (e.g., N-arachidonoyl dopamine, N-acyl taurines) suggested that some or many novel acyl amino acids could serve as signaling molecules. Here, we used a targeted lipidomics approach including specific enrichment steps, nano-LC/MS/MS, high-throughput screening of the datasets with a potent search algorithm based on fragment ion analysis, and quantification using the multiple reaction monitoring mode in Analyst software to measure the biological levels of acyl amino acids in rat brain. We successfully identified 50 novel endogenous acyl amino acids present at 0.2 to 69 pmol g(-1) wet rat brain.
Tan
Bo
B
Gill Center for Biomolecular Science and the Department of Psychological and Brain Sciences, Indiana University Bloomington IN 47405, USA. ttanbo76@hotmail.com
O'Dell
David K
DK
Yu
Y William
YW
Monn
M Francesca
MF
Hughes
H Velocity
HV
Burstein
Sumner
S
Walker
J Michael
JM
D000596:Amino Acids / Q000032:analysis*; D000818:Animals; D001921:Brain / Q000378:metabolism*; D002417:Cattle; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D050356:Lipid Metabolism; D008297:Male; D047492:Peroxisome Proliferator-Activated Receptors / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D043562:Receptors, G-Protein-Coupled / Q000819:agonists; D052616:Solid Phase Extraction; D053719:Tandem Mass Spectrometry / Q000379:methods*; D005680:gamma-Aminobutyric Acid / Q000378:metabolism
D000596:Amino Acids; D047492:Peroxisome Proliferator-Activated Receptors; D043562:Receptors, G-Protein-Coupled; D005680:gamma-Aminobutyric Acid