These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Differential spatial approximation between cholecystokinin residue 30 and receptor residues in active and inactive conformations.
    Author: Dong M, Hadac EM, Pinon DI, Miller LJ.
    Journal: Mol Pharmacol; 2005 Jun; 67(6):1892-900. PubMed ID: 15774770.
    Abstract:
    Understanding the structures of active and inactive agonist- and antagonist-bound receptor complexes is of great interest. In this work, we focus on position 30 of cholecystokinin (CCK) and its spatial approximation with the type A CCK receptor. For this, we developed two photoaffinity labeling probes, replacing the naturally occurring tryptophan with p-benzoyl-l-phenylalanine (Bpa) or p-nitro-phenylalanine (NO(2)-Phe). The Bpa probe was shown to represent an antagonist, whereas the NO(2)-Phe probe stimulated intracellular calcium as a fully efficacious agonist (EC(50) = 81 +/- 15 nM). Both ligands bound to the receptor specifically, although with lower affinity than CCK (K(i) values: Bpa probe, 270 +/- 72 nM; NO(2)-Phe probe, 180 +/- 40 nM). Both probes covalently labeled the receptor in an efficient manner. The Bpa antagonist labeled the receptor in two distinct regions as identified by cyanogen bromide cleavage, with labeled bands migrating at M(r) = 25,000 and 4500. The former represented the glycosylated amino-terminal fragment, with the site of attachment further localized by endoproteinase Lys-C cleavage to the region between Asn(10) and Lys(37). The latter was shown to represent the first extracellular loop using further cleavage and sequencing of the wild-type and a mutant receptor. Following the same approach, the NO(2)-Phe agonist probe was shown to also label the first extracellular loop region. Radiochemical sequencing identified that the Bpa antagonist probe labeled receptor residue Lys(105), whereas the NO(2)-Phe agonist probe labeled residue Leu(99). These data extend our understanding of the molecular basis of binding and the conformational states of this important receptor.
    [Abstract] [Full Text] [Related] [New Search]