Macromolecule Content

• Total Structure Weight: 2.43 kDa 
• Atom Count: 170 
• Residue Count: 21 
• Unique protein chains: 1

6CMH

SYNTHETIC LINEAR MODIFIED ENDOTHELIN-1 AGONIST

• DOI: 10.2210/pdb6CMH/pdb

• Classification: CONTRACTILE PROTEIN
• Mutation(s): No 


• Deposited: 1998-09-03 Released: 1999-09-29 
• Deposition Author(s): Hewage, C.M., Jiang, L., Parkinson, J.A., Ramage, R., Sadler, I.H.

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 10 
• Conformers Submitted: 1 

Literature

Solution structure of a novel ETB receptor selective agonist ET1-21 [Cys(Acm)1,15, Aib3,11, Leu7] by nuclear magnetic resonance spectroscopy and molecular modelling.

Hewage, C.M., Jiang, L., Parkinson, J.A., Ramage, R., Sadler, I.H.

(1999) J Pept Res 53: 223-233

• PubMed: 10231710 
• DOI: 10.1034/j.1399-3011.1999.00001.x
• Primary Citation of Related Structures:  
  3CMH, 6CMH


• PubMed Abstract: 
  

The solution structure of a biologically active modified linear endothelin-1 analogue, ET1-21[Cys(Acm)1,15, Aib3,11, Leu7], has been determined for the first time by two-dimensional nuclear magnetic resonance spectroscopy in a methanol-d3/water solvent mixture. Out of approximately one hundred linear peptide analogues tested by biological assay, this peptide, together with a dozen others, showed significant ETB selective agonist activity. Here we report the solution structure of an ETB selective agonist of a full-length, synthetic linear endothelin analogue. The calculated structures indicate that the peptide adopts an alpha-helical conformation between residues Ser5-His16, whilst both N- and C-termini show no preferred conformation. These results suggest that the disulphide bridges normally associated with endothelin and sarafotoxin peptides may not necessarily be important for either ETB receptor binding activity or the formation of a helical conformation in solution.

---

Organizational Affiliation: 

Department of Chemistry, University of Edinburgh, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (ENDOTHELIN-1)	A	21	N/A	Mutation(s): 0
Find proteins for P22388 (Rattus norvegicus) Explore P22388  Go to UniProtKB:  P22388

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
AIB	A	L-PEPTIDE LINKING	C4 H9 N O2		ALA

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 10 
• Conformers Submitted: 1 
• OLDERADO: 6CMH Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-09-03 
• Released Date: 1999-09-29 
Deposition Author(s): Hewage, C.M., Jiang, L., Parkinson, J.A., Ramage, R., Sadler, I.H.

Revision History 

• Version 1.0: 1999-09-29
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance