Related Experiment Video
Updated: Jul 5, 2026

Ileectomy-induced Bile Overaccumulation in Mouse Intestine
Published on: August 21, 2017
Vasoactive intestinal peptide receptor on liver plasma membranes: solubilization and cross-linking
1Department of Medicine, Duke University, Durham, NC.
Abstract:
The hepatic receptor for VIP was solubilized from rat liver plasma membranes with 1.4% digitonin and shown to conserve its ability to bind to the ligand. This solubilized receptor demonstrated the high affinity and specificity for VIP (KD approximately 1 nM, binding preference: VIP greater than PHI greater than secretin greater than thymosin alpha 1) which were observed with the nonsolubilized VIP receptor on intact liver plasma membranes. 125I-VIP was next cross-linked to either the solubilized or nonsolubilized receptor using disuccinimido suberate or disuccinimido dithiobis(propionate), and the resulting complexes analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis followed by autoradiography. A broad autoradiographic band which demonstrated a high affinity for VIP was identified at Mr 56,000 (53,000 in the absence of the reducing agent dithiothreitol) for both the solubilized and nonsolubilized receptors. We have thus been able to solubilize from rat liver plasma membranes a receptor with high affinity and specificity for VIP, and confirmed its structural similarity with the native VIP receptor in nonsolubilized membranes using cross-linking techniques.
Related Concept Videos
Receptor-mediated Endocytosis
Phosphoinositides and PIPs
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
GPI Anchoring of Proteins in the ER Membrane
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
Carrier-Mediated Transport
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
Factors Affecting Dissolution: Drug Permeability, Stability and Stereochemistry
Bioavailability Enhancement: Drug Permeability Enhancement

