title: Quantitative peptidomics of mice lacking peptide-processing enzymes.
abstract: Peptidomics is defined as the analysis of peptides present in a tissue extract, usually using mass spectrometry-based approaches. Unlike radioimmunoassay-based detection techniques, peptidomics measures the precise form of each peptide, including post-translational modifications, and can readily distinguish between longer and shorter forms of the same peptide. Also, peptidomics is not limited to known peptides and can detect hundreds of peptides in a single experiment. Quantitative peptidomics enables comparisons between two or more groups of samples and is perfect for studies examining the effect of gene knockouts on tissue levels of peptides. We describe the method for quantitative peptidomics using isotopic labels based on trimethylammonium butyrate, which can be synthesized in five different isotopic forms; this permits multivariate analysis of five different groups of tissue extracts in a single liquid chromatography/mass spectrometry run.
authors.affiliation: Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY 10461, USA. jonathan.wardman@phd.linstein.yu.edu
authors.forename: Jonathan
authors.initials: J
authors.lastname: Wardman
authors.forename: Lloyd D
authors.initials: LD
authors.lastname: Fricker
mesh_terms: D000818:Animals; D001921:Brain / Q000201:enzymology*; D001923:Brain Chemistry / Q000502:physiology; D002087:Butyrates / Q000737:chemistry; D002268:Carboxypeptidases / Q000032:analysis; D002853:Chromatography, Liquid / Q000379:methods; D007553:Isotope Labeling / Q000379:methods; D051379:Mice; D018345:Mice, Knockout; D010455:Peptides / Q000032:analysis / Q000737:chemistry; D045664:Proprotein Convertase 1 / Q000032:analysis*; D045706:Proprotein Convertase 2 / Q000032:analysis*; D011499:Protein Processing, Post-Translational / Q000502:physiology; D040901:Proteomics / Q000379:methods*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods; D014020:Tissue Extracts / Q000032:analysis
chemical_list: D002087:Butyrates; D010455:Peptides; D000644:Quaternary Ammonium Compounds; D014020:Tissue Extracts; D002268:Carboxypeptidases; D045664:Proprotein Convertase 1; D045706:Proprotein Convertase 2