Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

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Intermolecular interactions between cholecystokinin-8 and the third extracellular loop of the cholecystokinin-2 receptor

Giragossian, C.Mierke, D.F.

(2002) Biochemistry 41: 4560-4566

  • DOI: https://doi.org/10.1021/bi0160009
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The structure of the third extracellular loop of the human cholecystokinin-2 receptor, CCK2-R(352-379), and its interactions with the C-terminal octapeptide of cholecystokinin (CCK-8) have been determined by high-resolution NMR and computer simulations. In the presence of dodecylphosphocholine micelles, the structure of the receptor fragment consisted of three helices, with the first and third corresponding to residues of the extracellular ends of transmembrane helices (TM) 6 and 7, respectively. The central, extracellular helix, consisting of residues 363-368, was found to be closely associated with the membrane mimetic used during the spectroscopic studies and molecular dynamics (MD) simulations. Upon titration of CCK-8 to the receptor domain, chemical shift perturbation and intermolecular NOEs (Trp30, Met31 of CCK-8 and P371, F374 of CCK2-R) indicated the formation of a stable complex and specific ligand/receptor interactions. Using the NOE-generated intermolecular contact points, extensive MD simulations of CCK-8 bound to the CCK2 receptor were carried out. The results, with CCK-8 in close proximity to TM7, differ from previous structural studies of CCK-8 association with CCK1-R, in which the ligand formed a number of interactions with TM6. These differences may play a role in the ligand specificity displayed by the CCK1 and CCK2 receptor subtypes.

  • Organizational Affiliation

    Department of Chemistry, Division of Biology and Medicine, Brown University, Providence, Rhode Island 02912, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Gastrin/cholecystokinin type B receptor30N/AMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P32239 (Homo sapiens)
Explore P32239 
Go to UniProtKB:  P32239
PHAROS:  P32239
GTEx:  ENSG00000110148 
Entity Groups  
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UniProt GroupP32239
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-01-28
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-02-23
    Changes: Database references, Derived calculations