title: A case study on biological activity in a surface-bound multicomponent system: the biotin-streptavidin-peroxidase system.
abstract: The adsorption of multiple protein layers on biotinylated organic surfaces has been characterized using surface plasmon resonance (SPR) and atomic force microscopy (AFM). Diffusion-limited loading of the biotinylated self-assembled monolayers (SAMs) ensures a precise control of the streptavidin surface density. For the subsequent interaction with biotinylated peroxidase, SPR data hint at a streptavidin density dependent orientation during peroxidase adsorption. Microcontact printed well-defined two-dimensional patterned surfaces of biotinylated organothiols and protein-resistant OEG-thiols allow an in-situ differentiation of specific and nonspecific adsorption (e.g., mono- vs multilayer adsorption). Additionally, the very important issue of biological activity of surface-bound enzymes is addressed by comparing the enzyme activities in solution with that for surface-bound species.
authors.affiliation: Physikalische Chemie I, Ruhr-Universität Bochum, 44780 Bochum, Germany.
authors.forename: Rolf
authors.initials: R
authors.lastname: Chelmowski
authors.forename: Andreas
authors.initials: A
authors.lastname: Prekelt
authors.forename: Christian
authors.initials: C
authors.lastname: Grunwald
authors.forename: Christof
authors.initials: C
authors.lastname: Wöll
mesh_terms: D000327:Adsorption; D001710:Biotin / Q000378:metabolism*; D007700:Kinetics; D018625:Microscopy, Atomic Force; D010544:Peroxidases / Q000378:metabolism*; D019809:Streptavidin / Q000378:metabolism*; D020349:Surface Plasmon Resonance
chemical_list: D001710:Biotin; D019809:Streptavidin; D010544:Peroxidases