title: High-throughput proteomics using high-efficiency multiple-capillary liquid chromatography with on-line high-performance ESI FTICR mass spectrometry.
abstract: We report on the design and application of a high-efficiency multiple-capillary liquid chromatography (LC) system for high-throughput proteome analysis. The multiple-capillary LC system using commercial LC pumps was operated at a pressure of 10,000 psi to deliver mobile phases through a novel passive feedback valve arrangement that permitted mobile-phase flow path switching and efficient sample introduction. The multiple-capillary LC system uses several serially connected dual-capillary column devices. The dual-capillary column approach eliminates the time delays for column regeneration (or equilibration) since one capillary column was used for a separation while the other was being washed. Several serially connected dual-capillary columns and electrospray ionization (ESI) sources were operated independently and can be used either for "backup" operation or for parallel operation with other mass spectrometers. This high-efficiency multiple-capillary LC system utilizes switching valves for all operations, enabling automated operation. The separation efficiency of the dual-capillary column arrangement, optimal capillary dimensions (column length and packed particle size), capillary regeneration conditions, and mobile-phase compositions and their compatibility with electrospray ionization were investigated. A high magnetic field (11.4 T) Fourier transform ion cyclotron resonance (FTICR) mass spectrometer was coupled on-line with this high-efficiency multiple-capillary LC system using an ESI interface. The capillary LC provided a peak capacity of approximately 650, and the 2-D capillary LC-FTICR analysis provided a combined resolving power of > 6 x 10(7) components. For yeast cytosolic tryptic digests > 100,000 polypeptides were detected, and approximately 1,000 proteins could be characterized from a single capillary LC-FTICR analysis using the high mass measurement accuracy (approximately 1 ppm) of FTICR, and likely more if LC retention time information were also exploited for peptide identification.
authors.affiliation: Environmental Molecular Sciences Laboratory, Richland, Washington 99352, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Shen
authors.forename: N
authors.initials: N
authors.lastname: Tolić
authors.forename: R
authors.initials: R
authors.lastname: Zhao
authors.forename: L
authors.initials: L
authors.lastname: Pasa-Tolić
authors.forename: L
authors.initials: L
authors.lastname: Li
authors.forename: S J
authors.initials: SJ
authors.lastname: Berger
authors.forename: R
authors.initials: R
authors.lastname: Harkewicz
authors.forename: G A
authors.initials: GA
authors.lastname: Anderson
authors.forename: M E
authors.initials: ME
authors.lastname: Belov
authors.forename: R D
authors.initials: RD
authors.lastname: Smith
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D005656:Fungal Proteins / Q000737:chemistry; D010449:Peptide Mapping; D020543:Proteome; D015203:Reproducibility of Results; D012441:Saccharomyces cerevisiae / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D014357:Trypsin / Q000737:chemistry
chemical_list: D005656:Fungal Proteins; D020543:Proteome; D014357:Trypsin