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Updated: Dec 27, 2025

Determining Cell-surface Expression and Endocytic Rate of Proteins in Primary Astrocyte Cultures Using Biotinylation
Published on: July 3, 2017
Biotinylation of Membrane Proteins for Binder Selections
Benedikt T Kuhn1, Iwan Zimmermann2, Pascal Egloff2
1Institute for Biochemistry, Biocenter, Goethe University Frankfurt, Frankfurt, Germany.
Abstract:
The selective immobilization of proteins represents an essential step in the selection of binding proteins such as antibodies. The immobilization strategy determines how the target protein is presented to the binders and thereby directly affects the experimental outcome. This poses specific challenges for membrane proteins due to their inherent lack of stability and limited exposed hydrophilic surfaces. Here we detail methodologies for the selective immobilization of membrane proteins based on the strong biotin-avidin interaction and with a specific focus on its application for the selection of nanobodies and sybodies. We discuss the challenges in generating and benefits of obtaining an equimolar biotin to target-protein ratio.
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