The X-ray crystal structure of human endothelin-1, a polypeptide hormone regulator of blood pressure

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.208 

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The X-ray crystal structure of human endothelin 1, a polypeptide hormone regulator of blood pressure.

McPherson, A.Larson, S.B.

(2019) Acta Crystallogr F Struct Biol Commun 75: 47-53

  • DOI: https://doi.org/10.1107/S2053230X18016011
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Human endothelin is a 21-amino-acid polypeptide, constrained by two intra-chain disulfide bridges, that is made by endothelial cells. It is the most potent vasoconstrictor in the body and is crucially important in the regulation of blood pressure. It plays a major role in a host of medical conditions, including hypertension, diabetes, stroke and cancer. Endothelin was crystallized 28 years ago in the putative space group P6 1 22, but the structure was never successfully solved by X-ray diffraction. Using X-ray diffraction data from 1992, the structure has now been solved. Assuming a unit cell belonging to space group P6 1 and a twin fraction of 0.28, a solution emerged with two, almost identical, closely associated molecules in the asymmetric unit. Although the data extended to beyond 1.8 Å resolution, a model containing 25 waters was refined to 1.85 Å resolution with an R of 0.216 and an R free of 0.284. The disulfide-constrained `core' of the molecule, amino-acid residues 1-15, has a main-chain conformation that is essentially the same as endothelin when bound to its receptor, but many side-chain rotamers are different. The carboxy-terminal `tail' comprising amino-acid residues 16-21 is extended as when receptor-bound, but it exhibits a different conformation with respect to the `core'. The dimer that comprises the asymmetric unit is maintained almost exclusively by hydrophobic interactions and may be stable in an aqueous medium.

  • Organizational Affiliation

    Molecular Biology and Biochemistry, University of California Irvine, McGaugh Hall, Irvine, CA 92697-3900, USA.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Endothelin-1A [auth B],
B [auth A]
21Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P05305 (Homo sapiens)
Explore P05305 
Go to UniProtKB:  P05305
PHAROS:  P05305
GTEx:  ENSG00000078401 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05305
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.208 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 27.328α = 90
b = 27.328β = 90
c = 79.538γ = 120
Software Package:
Software NamePurpose
SDMSdata reduction
Aimlessdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-02
    Type: Initial release
  • Version 1.1: 2019-01-16
    Changes: Advisory, Data collection, Database references, Derived calculations
  • Version 1.2: 2023-10-11
    Changes: Data collection, Database references, Refinement description