title: Capillary electrophoresis/tandem mass spectrometry for analysis of proteins from two-dimensional sodium dodecyl sulfate polyacrylamide gel electrophoresis.
abstract: Capillary electrophoresis/time-of-flight mass spectrometry(CE/TOFMS) has been used for analysis of in-gel digests of protein spots excised from two-dimensional sodium dodecyl sulfate polyacrylamide gel electrophoresis (2-D SDS-PAGE). An off-line purification and preconcentration procedure with a Zip Tip is used before CE/TOFMS analysis which allows for detection of protein spots with <1 picomole of material from 2-D gels. The off-line procedure provides sufficient purification for analysis while maintaining the quality of the CE separation. Using this procedure, several proteins from Coomassie Blue and zinc negatively stained gels are identified by the peptide maps generated and database searching. CE/TOF tandem mass spectrometry is used for the confirmation of database searching results and structural analysis of peptides that do not match the expected peptide maps obtained from the database in order to identify structural modifications. Several modifications were pinpointed and identified by this method.
authors.affiliation: Department of Chemistry, University of Michigan, Ann Arbor, MI 48109, USA.
authors.forename: X
authors.initials: X
authors.lastname: Jin
authors.forename: Y
authors.initials: Y
authors.lastname: Chen
authors.forename: D M
authors.initials: DM
authors.lastname: Lubman
authors.forename: D
authors.initials: D
authors.lastname: Misek
authors.forename: S M
authors.initials: SM
authors.lastname: Hanash
mesh_terms: D000230:Adenocarcinoma / Q000737:chemistry; D004396:Coloring Agents; D019992:Databases as Topic; D019075:Electrophoresis, Capillary / Q000379:methods; D015180:Electrophoresis, Gel, Two-Dimensional / Q000379:methods; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D004938:Esophageal Neoplasms / Q000737:chemistry; D006801:Humans; D007202:Indicators and Reagents; D009363:Neoplasm Proteins / Q000032:analysis / Q000737:chemistry; D010446:Peptide Fragments / Q000032:analysis; D010449:Peptide Mapping; D011506:Proteins / Q000032:analysis* / Q000737:chemistry; D012680:Sensitivity and Specificity; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods; D013950:Thymus Gland / Q000737:chemistry
chemical_list: D004396:Coloring Agents; D007202:Indicators and Reagents; D009363:Neoplasm Proteins; D010446:Peptide Fragments; D011506:Proteins