title: High-throughput middle-down analysis using an orbitrap.
abstract: This report demonstrates the application of a capillary LC-LTQ-orbitrap system to provide automated middle-down analysis of proteolytic peptides in the mass range 3000 to 10,000 Da. The novel workflow combines an underutilized method in the orbitrap-high resolution, mass-accurate product ion measurements-with software tailored to search such data (ProSightPC 2.0) and an Asp-selective chemical cleavage approach that generates peptides across an extended mass range. The strategy using high resolution mass measurements on both precursor and product ions is analogous to that widely used on FT-ICR analyzers. The approach is demonstrated in an analysis of the highly basic ribosomal proteome isolated from human MCF7 cancer cells.
authors.affiliation: Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20274, USA.
authors.forename: Joe
authors.initials: J
authors.lastname: Cannon
authors.forename: Karen
authors.initials: K
authors.lastname: Lohnes
authors.forename: Colin
authors.initials: C
authors.lastname: Wynne
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Nathan
authors.initials: N
authors.lastname: Edwards
authors.forename: Catherine
authors.initials: C
authors.lastname: Fenselau
mesh_terms: D045744:Cell Line, Tumor; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006801:Humans; D013058:Mass Spectrometry / Q000295:instrumentation* / Q000379:methods*; D010455:Peptides / Q000032:analysis* / Q000302:isolation & purification; D040901:Proteomics / Q000295:instrumentation* / Q000379:methods*; D012269:Ribosomal Proteins / Q000032:analysis* / Q000302:isolation & purification; D055672:Static Electricity
chemical_list: D010455:Peptides; D012269:Ribosomal Proteins