title: Ultrathin coatings from isocyanate terminated star PEG prepolymers: patterning of proteins on the layers.
abstract: This study presents the easy and fast patterning of low molecular weight molecules that act as binding partners for proteins on Star PEG coatings. These coatings are prepared from isocyanate terminated star shaped prepolymers and form a highly cross-linked network on the substrate in which the stars are connected via urea groups and free amino groups are present. Streptavidin has been patterned on these layers by microcontact printing (muCP) of an amino reactive biotin derivative and consecutive binding of streptavidin to the biotin. Patterns of Ni(2+)-nitriltriacetic acid (NTA) receptors have been prepared by printing amino functional NTA molecules in freshly prepared Star PEG layers that still contain amino reactive isocyanate groups. Complexation of the NTA groups with Ni(II) ions enabled the binding of His-tag enhanced green fluorescent protein (EGFP) in the desired pattern on the substrates. Since the unmodified Star PEG layers prevent unspecific protein adsorption, His-EGFP could selectively be bound to the sample by immersion into crude, nonpurified His-tag EGFP containing cell lysate.
authors.affiliation: Deutsches Wollforschungsinstitut an der RWTH Aachen, Pauwelsstrasse 8, 52074 Aachen, Germany.
authors.forename: Juergen
authors.initials: J
authors.lastname: Groll
authors.forename: Wulf
authors.initials: W
authors.lastname: Haubensak
authors.forename: Thomas
authors.initials: T
authors.lastname: Ameringer
authors.forename: Martin
authors.initials: M
authors.lastname: Moeller
mesh_terms: D001710:Biotin / Q000031:analogs & derivatives / Q000737:chemistry; D049452:Green Fluorescent Proteins / Q000737:chemistry*; D017953:Isocyanates / Q000737:chemistry*; D015394:Molecular Structure; D011092:Polyethylene Glycols / Q000737:chemistry*
chemical_list: D017953:Isocyanates; C485184:enhanced green fluorescent protein; D049452:Green Fluorescent Proteins; D011092:Polyethylene Glycols; C093086:biotinamide; D001710:Biotin