title: Comparative study of [Three] LC-MALDI workflows for the analysis of complex proteomic samples.
abstract: Large-scale proteomic analyses frequently rely on high-resolution peptide separation of digested protein mixtures in multiple dimensions to achieve accuracy in sample detection and sensitivity in dynamic range of coverage. This study was undertaken to demonstrate the feasibility of MALDI MS/MS with off-line coupling to HPLC for the analysis of whole cell lysates of wild-type yeast by three different workflows: SCX-RPHPLC-MS/MS, high-pH SAX-RPHPLC-MS/MS and RP (protein)-SCX-RPHPLC-MS/MS. The purpose of these experiments was to demonstrate the effect of a workflow on the end results in terms of the number of proteins detected, the average peptide coverage of proteins, and the number of redundant peptide sequencing attempts. Using 60 microg of yeast lysate, minor differences were seen in the number of proteins detected by each method (800-1200). The most significant differences were observed in redundancy of MS/MS acquisitions.
authors.affiliation: Applied Biosystems, 500 Old Connecticut Path, Framingham, Massachusetts 01701, USA. hattansn@appliedbiosystems.com
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Hattan
authors.forename: Jason
authors.initials: J
authors.lastname: Marchese
authors.forename: Nikita
authors.initials: N
authors.lastname: Khainovski
authors.forename: Steve
authors.initials: S
authors.lastname: Martin
authors.forename: Peter
authors.initials: P
authors.lastname: Juhasz
mesh_terms: D002412:Cations; D002845:Chromatography; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D004591:Electrophoresis, Polyacrylamide Gel; D005656:Fungal Proteins / Q000032:analysis*; D013058:Mass Spectrometry; D010455:Peptides / Q000737:chemistry; D040901:Proteomics / Q000295:instrumentation* / Q000379:methods*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000295:instrumentation* / Q000379:methods*; D013997:Time Factors; D014466:Ultraviolet Rays; D015003:Yeasts / Q000378:metabolism
chemical_list: D002412:Cations; D005656:Fungal Proteins; D010455:Peptides