title: A proteomic approach to the identification of cytochrome P450 isoforms in male and female rat liver by nanoscale liquid chromatography-electrospray ionization-tandem mass spectrometry.
abstract: Nanoscale reversed-phase liquid chromatography (LC) combined with electrospray ionization-tandem mass spectrometry (ESI-MS/MS) has been used as a method for the direct identification of multiple cytochrome P450 (P450) isoforms found in male and female rat liver. In this targeted proteomic approach, rat liver microsomes were subjected to sodium dodecyl sulfate-polyacrylamide gel electrophoresis followed by in-gel tryptic digestion of the proteins present in the 48- to 62-kDa bands. The resultant peptides were extracted and analyzed by LC-ESI-MS/MS. P450 identifications were made by searching the MS/MS data against a rat protein database containing 21,576 entries including 47 P450s using Sequest software (Thermo Electron, Hemel Hempstead, UK). Twenty-four P450 isoforms from the subfamilies 1A, 2A, 2B, 2C, 2D, 2E, 3A, 4A, 4F, CYP17, and CYP19 were positively identified in rat liver.
authors.affiliation: Department of Pharmaceutical & Biological Chemistry, The School of Pharmacy, University of London, 29-39 Brunswick Square, London, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Nisar
authors.forename: C S
authors.initials: CS
authors.lastname: Lane
authors.forename: A F
authors.initials: AF
authors.lastname: Wilderspin
authors.forename: K J
authors.initials: KJ
authors.lastname: Welham
authors.forename: W J
authors.initials: WJ
authors.lastname: Griffiths
authors.forename: L H
authors.initials: LH
authors.lastname: Patterson
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002853:Chromatography, Liquid / Q000379:methods; D003577:Cytochrome P-450 Enzyme System / Q000737:chemistry* / Q000302:isolation & purification; D005260:Female; D008297:Male; D008862:Microsomes, Liver / Q000737:chemistry* / Q000201:enzymology; D036103:Nanotechnology / Q000379:methods*; D020033:Protein Isoforms / Q000737:chemistry* / Q000302:isolation & purification; D040901:Proteomics / Q000379:methods*; D051381:Rats; D012737:Sex Factors; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods
chemical_list: D020033:Protein Isoforms; D003577:Cytochrome P-450 Enzyme System