NDLI: Two-dimensional recognition pattern of lipid-anchored Fab' fragments.

Content Provider	PubMed Central
Author	Egger, M. Heyn, S. P. Gaub, H. E.
Abstract	A two-dimensional pattern of oriented antibody fragments was formed at the air-water interface and transferred onto a solid support. The Fab'-fragments of a monoclonal antibody against the hapten dinitrophenyl (DNP) were covalently linked via a hydrophilic spacer to phospholipid vesicles. A monomolecular lipid-protein layer at equilibrium with these vesicles was allowed to form at the air-water interface. The monolayer was separated from the vesicle phase and transferred to a Langmuir-Blodgett trough. By cooling and compressing, the previously homogeneous lipid-protein film was driven into a two-dimensional phase separation resulting in protein-rich domains and a second phase consisting mainly of lipid. This film was transferred onto a solid support in a way that preserved the protein-lipid pattern. The specificity as well as the contrast in the binding activity of the two different separated phases were then quantified using microfluorometry. DNP conjugated to fluorescein-labeled bovine serum albumin (BSA) showed virtually no binding to the lipid regions, but gave a ratio of bound DNP-BSA to Fab'-lipid of greater than 50% in the protein-rich domains proving that the Fab'-moiety retained its biological activity. This demonstrates that the technique presented here is well suited to modify different solid surfaces with a pattern of a given biological function. The optional control of lateral packing and orientation of the components in the monolayer makes it a general tool for the reconstitution of supported lipid-protein membranes and might also open new ways for the two-dimensional crystallization of proteins at membranes.
Related Links	http://dx.doi.org/10.1016/s0006-3495(90)82586-8
Ending Page	673
Page Count	5
Starting Page	669
File Format	PDF
ISSN	00063495
e-ISSN	15420086
Journal	Biophysical Journal
Issue Number	3
Volume Number	57
Language	English
Publisher Date	1990-03-01
Access Restriction	Open
Subject Keyword	Biophysics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Biophysics

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