1GEA

RECEPTOR-BOUND CONFORMATION OF PACAP21


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Conformation of a peptide ligand bound to its G-protein coupled receptor.

Inooka, H.Ohtaki, T.Kitahara, O.Ikegami, T.Endo, S.Kitada, C.Ogi, K.Onda, H.Fujino, M.Shirakawa, M.

(2001) Nat.Struct.Mol.Biol. 8: 161-165

  • DOI: 10.1038/84159

  • PubMed Abstract: 
  • Many peptide hormones elicit a wide array of physiological effects by binding to G-protein coupled receptors. We have determined the conformation of pituitary adenylate cyclase activating polypeptide, PACAP(1--21)NH(2), bound to a PACAP-specific rece ...

    Many peptide hormones elicit a wide array of physiological effects by binding to G-protein coupled receptors. We have determined the conformation of pituitary adenylate cyclase activating polypeptide, PACAP(1--21)NH(2), bound to a PACAP-specific receptor by NMR spectroscopy. Residues 3--7 form a unique beta-coil structure that is preceded by an N-terminal extended tail. This beta-coil creates a patch of hydrophobic residues that is important for receptor binding. In contrast, the C-terminal region (residues 8--21) forms an alpha-helix, similar to that in the micelle-bound PACAP. Thus, the conformational difference between PACAP in the receptor-bound and the micelle-bound states is limited to the N-terminal seven residues. This observation is consistent with the two-step ligand transportation model in which PACAP first binds to the membrane nonspecifically and then diffuses two-dimensionally in search of its receptor; a conformational change at the N-terminal region then allows specific interactions between the ligand and the receptor.


    Organizational Affiliation

    Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan. Inooka_Hiroshi@takeda.co.jp




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PITUITARY ADENYLATE CYCLASE ACTIVATING POLYPEPTIDE
A
21Homo sapiensMutation(s): 0 
Gene Names: ADCYAP1
Find proteins for P18509 (Homo sapiens)
Go to Gene View: ADCYAP1
Go to UniProtKB:  P18509
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
LYN
Query on LYN
A
L-PEPTIDE LINKINGC6 H16 N3 OLYS
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 1GEA Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-04-20
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance