title: An effective method for de novo peptide sequencing based on phosphorylation strategy and mass spectrometry.
abstract: An effective method for peptide sequencing based on phosphorylation strategy and UPLC-MS/MS is proposed in this report. A phosphorylation reaction was carried out by mixing model peptide solution with phosphorylation solution. UPLC-MS/MS was used to analyze and characterize the phosphorylated peptides in the optimized ramp collision energy mode. The results illustrated that this phosphorylation approach significantly strengthened the signal intensity of both a(1) and b series ions of the spectra of the modified peptides. It also can be used to effectively distinguish glutamine (Q) and lysine (K) residues in peptides. The feasibility of this approach was validated by analyzing the trypsin-digested BSA. Data suggested that this proposed method could be a useful tool for the de novo peptide sequencing in proteome research.
authors.affiliation: The Key Laboratory of Chemical Biology, Guangdong Province, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
authors.forename: Dongmei
authors.initials: D
authors.lastname: Zhang
authors.forename: Hongxia
authors.initials: H
authors.lastname: Liu
authors.forename: Shusheng
authors.initials: S
authors.lastname: Zhang
authors.forename: Xiaolan
authors.initials: X
authors.lastname: Chen
authors.forename: Shangfu
authors.initials: S
authors.lastname: Li
authors.forename: Cunlong
authors.initials: C
authors.lastname: Zhang
authors.forename: Xiangming
authors.initials: X
authors.lastname: Hu
authors.forename: Kaishun
authors.initials: K
authors.lastname: Bi
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Chen
authors.forename: Yuyang
authors.initials: Y
authors.lastname: Jiang
mesh_terms: D000595:Amino Acid Sequence; D002853:Chromatography, Liquid; D007700:Kinetics; D010455:Peptides / Q000737:chemistry*; D010766:Phosphorylation; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D010455:Peptides