vasoactive-intestinal-peptide and sulfosuccinimidyl-6-(biotinamido)hexanoate

Vasoactive intestinal polypeptide (VIP) was biotinyl-epsilon-aminocaproylated using sulfosuccinimidyl-6-(biotinamido) hexanoate thereby producing a series of products that were separated by high performance liquid chromatography (HPLC). Seven VIP-derivatives were isolated and the number and location of biotinyl-epsilon-aminocaproylation was determined by a combination of enzymatic degradation and plasma desorption mass spectrometry (PDMS). Receptor binding experiments with the VIP biotinyl-epsilon-aminocaproylated derivatives revealed IC50 values for the monobiotinyl-epsilon-aminocaproylated peptides that were 1.3-3.2 times higher than for natural VIP. All isolated biotinyl-epsilon-aminocaproylated derivatives possess VIP-like bioactivity as shown by an assay measuring pancreatic juice secretion in cat, VIP biotinyl-epsilon-aminocaproylated in position lysine being almost equipotent with natural VIP.

Topics: Amino Acid Sequence; Animals; Binding, Competitive; Biotin; Cell Membrane; Chromatography, High Pressure Liquid; Cross-Linking Reagents; Liver; Mass Spectrometry; Molecular Probes; Molecular Sequence Data; Receptors, Gastrointestinal Hormone; Receptors, Vasoactive Intestinal Peptide; Succinimides; Swine; Vasoactive Intestinal Peptide