title: Identification of proteins bound to a thioaptamer probe on a proteomics array.
abstract: A rapid method to screen and identify unknown bound proteins to specific nucleic acid probes anchored on ProteinChip array surfaces from crude biological samples has been developed in this paper. It was demonstrated with screening specific binding proteins from LPS-stimulated mouse 70Z/3 pre-B cell nuclear extracts by direct coupling of thioaptamer XBY-S2 to the pre-activated ProteinChip array surfaces. With pre-fractionation of crude nuclear extracts by ion exchange method, specific "on-chip" captured proteins have been obtained that were pure enough to do "on-chip" digestion and the subsequent identification of the "on-chip" bound proteins by microsequencing of the trypsin digested peptide fragments through tandem MS. Five mouse heterogeneous nuclear ribonucleoproteins (hnRNPs) A1, A2/B1, A3, A/B, and D0 were identified. To verify those bound hnRNPs, a novel thioaptamer/antibody sandwich assay provides highly sensitive and selective identification of proteins on ProteinChip arrays.
authors.affiliation: Ciphergen, Inc., Fremont, CA 94555, USA.
authors.forename: He
authors.initials: H
authors.lastname: Wang
authors.forename: Xianbin
authors.initials: X
authors.lastname: Yang
authors.forename: Gavin C
authors.initials: GC
authors.lastname: Bowick
authors.forename: Norbert K
authors.initials: NK
authors.lastname: Herzog
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Luxon
authors.forename: Lee O
authors.initials: LO
authors.lastname: Lomas
authors.forename: David G
authors.initials: DG
authors.lastname: Gorenstein
mesh_terms: D000818:Animals; D002457:Cell Extracts; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D013058:Mass Spectrometry; D051379:Mice; D015335:Molecular Probes / Q000737:chemistry* / Q000378:metabolism*; D040081:Protein Array Analysis / Q000379:methods*; D011485:Protein Binding; D011506:Proteins / Q000378:metabolism*; D040901:Proteomics / Q000379:methods*; D013438:Sulfhydryl Compounds / Q000737:chemistry* / Q000378:metabolism*
chemical_list: D002457:Cell Extracts; D015335:Molecular Probes; D011506:Proteins; D013438:Sulfhydryl Compounds