title: Selective isolation of N-blocked peptides by isocyanate-coupled resin.
abstract: We developed a method for selective isolation of N-blocked peptides from a complex mixture such as an enzymatic digest of a protein. The approach is based on a newly designed isocyanate-resin (resin-NCO), which specifically reacts with alpha-amino or imino groups. This method, then, permits the isolation of N-blocked peptides, even those containing Lys, from a peptide mixture as intact forms by trapping N-free peptides via covalent bonding to the resin-NCO. The present study demonstrates the performance of this method for the selective isolation of N-blocked peptides by applying it to several peptide mixtures, including proteolytic digests.
authors.affiliation: Laboratory of Protein Profiling and Functional Proteomics, Institute for Protein Research, Osaka University, Yamadaoka 3-2, Suita, Osaka 565-0871, Japan.
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Mikami
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Takao
mesh_terms: D017953:Isocyanates / Q000737:chemistry*; D008969:Molecular Sequence Data; D015394:Molecular Structure; D010455:Peptides / Q000737:chemistry* / Q000302:isolation & purification*; D012117:Resins, Synthetic / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D017953:Isocyanates; D010455:Peptides; D012117:Resins, Synthetic