title: Interaction of xenin with the neurotensin receptor of guinea pig enteral smooth muscles.
abstract: Xenin, a 25 aminoacid peptide, interacts with the neurotensin receptor subtype 1 of intestinal muscles of the guinea pig. Replacement of the C-terminal Lys -Arg peptide bond in xenin 6 by a reduced pseudo-peptide bond augmented binding affinity to isolated jejunal and colonic muscle membranes by factors of 7.7 and 21.0 respectively; the potency to contract the jejunum and to relax the colon was increased by factors of 3.2 and 1.3. The C-terminus Trp-Ile-Leu (WIL) of xenin, in contrast to the C-terminus Tyr-Ile-Leu (YIL) of neurotensin, bound competitively to the muscle membranes. WIL blocked the contractile action of xenin in the jejunum and was synergistic with the relaxing action in the colon. The Lys -Arg motif and Trp in the C-terminus of xenin are essential structures in the action of xenin on the enteral smooth muscle receptors.
authors.affiliation: DRK-Krankenhaus Neuwied, Medizinische Klinik, Rheinische Friedrich-Wilhelms Universität, Bonn, Germany. g.feurle@uni-bonn.de
authors.forename: Gerhard E
authors.initials: GE
authors.lastname: Feurle
authors.forename: Jörg W
authors.initials: JW
authors.lastname: Metzger
authors.forename: Alexandra
authors.initials: A
authors.lastname: Grudinski
authors.forename: Gerd
authors.initials: G
authors.lastname: Hamscher
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001667:Binding, Competitive; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008969:Molecular Sequence Data; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology; D009496:Neurotensin; D010455:Peptides / Q000494:pharmacology*; D018028:Receptors, Neurotensin / Q000378:metabolism*
chemical_list: D010455:Peptides; D018028:Receptors, Neurotensin; C077659:xenin 25; D009496:Neurotensin