1HZN

NMR SOLUTION STRUCTURE OF THE THIRD EXTRACELLULAR LOOP OF THE CHOLECYSTOKININ A RECEPTOR


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

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

Giragossian, C.Mierke, D.F.

(2001) Biochemistry 40: 3804-3809

  • DOI: 10.1021/bi002659n
  • Primary Citation of Related Structures:  
    1HZN

  • PubMed Abstract: 
  • The interaction of the C-terminal octapeptide of cholecystokinin, CCK-8, with the third extracellular loop of human cholecystokinin-A receptor, CCK(A)-R(329-357), has been probed by high-resolution NMR and extensive computer simulations. The structure of CCK(A)-R(329-357) in the presence of dodecylphosphocholine micelles consists of three alpha-helices, with the first and third corresponding to the extracellular ends of transmembrane (TM) helices 6 and 7 ...

    The interaction of the C-terminal octapeptide of cholecystokinin, CCK-8, with the third extracellular loop of human cholecystokinin-A receptor, CCK(A)-R(329-357), has been probed by high-resolution NMR and extensive computer simulations. The structure of CCK(A)-R(329-357) in the presence of dodecylphosphocholine micelles consists of three alpha-helices, with the first and third corresponding to the extracellular ends of transmembrane (TM) helices 6 and 7. The central helix, residues W335-R345, is found to lie on the zwitterionic surface. Titration with CCK-8 produces a stable complex with a number of intermolecular NOEs between the C-terminus of the ligand (Trp(30), Met(31), Asp(32)) and the interface of TM6 and the third extracellular loop (N333, A334, Y338) of the receptor fragment. The mode of ligand binding based on these intermolecular NOEs is in agreement with a number of published findings from receptor mutagenesis and photoaffinity cross-linking. Utilizing these ligand/receptor points of interaction, the structural features of CCK(A)-R(329-357), and also the structures of CCK-8 and CCK(A)-R(1-47) previously determined, extensive molecular dynamics simulations of the CCK-8/CCK(A)-R complex were carried out. The results provide unique insight into the molecular interactions and forces important for the binding of CCK-8 to CCK(A)-R.


    Organizational Affiliation

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



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CHOLECYSTOKININ TYPE A RECEPTORA31N/AMutation(s): 0 
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P32238 (Homo sapiens)
Explore P32238 
Go to UniProtKB:  P32238
PHAROS:  P32238
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 
  • Selection Criteria: structures with the least restraint violations 
  • OLDERADO: 1HZN Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-04-25
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance