Macromolecule Content

• Total Structure Weight: 2.52 kDa 
• Atom Count: 177 
• Modelled Residue Count: 21 
• Deposited Residue Count: 21 
• Unique protein chains: 1

1GEA

RECEPTOR-BOUND CONFORMATION OF PACAP21

• DOI: 10.2210/pdb1GEA/pdb
• BMRB: 4916

• Classification: NEUROPEPTIDE
• Mutation(s): Yes 


• Deposited: 2000-10-20 Released: 2001-04-20 
• Deposition Author(s): Inooka, H., Ohtaki, T., Kitahara, O., Ikegami, T., Endo, S., Kitada, C., Ogi, K., Onda, H., Fujino, M., Shirakawa, M.

---

Experimental Data Snapshot

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

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 Biol 8: 161-165

• PubMed: 11175907 
• DOI: 10.1038/84159
• Primary Citation of Related Structures:  
  1GEA


• 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 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. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PITUITARY ADENYLATE CYCLASE ACTIVATING POLYPEPTIDE	A	21	N/A	Mutation(s): 1
Find proteins for P18509 (Homo sapiens) Explore P18509  Go to UniProtKB:  P18509
NIH Common Fund Data Resources
PHAROS:  P18509 GTEx:  ENSG00000141433

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
LYN	A	L-PEPTIDE LINKING	C6 H16 N3 O		LYS

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

Entry History 

Deposition Data

• Deposited Date: 2000-10-20 
• Released Date: 2001-04-20 
Deposition Author(s): Inooka, H., Ohtaki, T., Kitahara, O., Ikegami, T., Endo, S., Kitada, C., Ogi, K., Onda, H., Fujino, M., Shirakawa, M.

Revision History  

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