title: Analysis of protein interactions on protein arrays by a wavelength interrogation-based surface plasmon resonance biosensor.
abstract: We have investigated whether surface plasmon resonance (SPR) sensors based on the wavelength interrogation are able to analyze protein interactions on protein arrays. The spectral SPR sensor was self-constructed and its detection limit, expressed as the minimal refractive index variation, was calculated to be 6.6x10(-5) with the signal fluctuation of 1.0x10(-5). The protein array surface was modified by a mixed thiol monolayer to immobilize proteins. Protein arrays were analyzed by the line-scanning mode of the SPR sensor, which scanned every 100 microm along the central line of array spots and the scanned results were presented by color spectra from blue to red. Glutathione S-transferase (GST)-rac1 caused a concentration-dependent increase of SPR wavelength shift on protein arrays. The surface structure of the protein arrays was analyzed by atomic force microscopy. Specific interactions of antigens with antibodies were analyzed on the protein arrays by using three antibodies and eight proteins. These results suggest that the wavelength interrogation-based SPR sensor can be used as the biosensor for the high-throughput analysis of protein interactions on protein arrays.
authors.affiliation: Department of Molecular and Cellular Biochemistry, Kangwon National University School of Medicine, Chunchon, Kangwon-Do, South Korea.
authors.forename: Jong Seol
authors.initials: JS
authors.lastname: Yuk
authors.forename: Se-Hui
authors.initials: SH
authors.lastname: Jung
authors.forename: Jae-Wan
authors.initials: JW
authors.lastname: Jung
authors.forename: Duk-Geun
authors.initials: DG
authors.lastname: Hong
authors.forename: Jeong-A
authors.initials: JA
authors.lastname: Han
authors.forename: Young-Myeong
authors.initials: YM
authors.lastname: Kim
authors.forename: Kwon-Soo
authors.initials: KS
authors.lastname: Ha
mesh_terms: D000906:Antibodies / Q000737:chemistry / Q000276:immunology; D000941:Antigens / Q000737:chemistry / Q000276:immunology; D015374:Biosensing Techniques; D005982:Glutathione Transferase / Q000737:chemistry / Q000378:metabolism; D018625:Microscopy, Atomic Force; D040081:Protein Array Analysis; D025941:Protein Interaction Mapping; D011506:Proteins / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000378:metabolism; D020349:Surface Plasmon Resonance; D013997:Time Factors; D020830:rac1 GTP-Binding Protein / Q000737:chemistry / Q000378:metabolism
chemical_list: D000906:Antibodies; D000941:Antigens; D011506:Proteins; D011993:Recombinant Fusion Proteins; D005982:Glutathione Transferase; D020830:rac1 GTP-Binding Protein