Related Experiment Videos
The crystal structure of human endothelin
R W Janes1, D H Peapus, B A Wallace
1Department of Crystallography, Birkbeck College, University of London, UK.
Nature Structural Biology
|May 1, 1994
Summary
The crystal structure of endothelin, a potent vasoconstrictor, reveals a helical carboxy-terminal tail. This differs from NMR models and may impact receptor binding and vasoactivity.
Area of Science:
- Biochemistry
- Structural Biology
- Pharmacology
Background:
- Endothelin is the most potent vasoconstrictor identified.
- Understanding its three-dimensional structure is crucial for elucidating its function.
Purpose of the Study:
- To determine the high-resolution three-dimensional structure of endothelin.
- To compare the crystal structure with existing NMR-derived models.
Main Methods:
- X-ray crystallography was used to determine the structure to 2.18 A resolution.
- Molecular replacement techniques were employed using an NMR-derived model fragment for initial phasing.
Main Results:
- The crystal structure revealed differences compared to NMR models, particularly in the carboxy-terminal region.
- The carboxy-terminal tail (residues 16-21) adopted a helical conformation in the crystal structure, unlike in NMR structures.
Conclusions:
- The helical carboxy-terminal tail in the crystal structure may be functionally significant.
- This region is critical for endothelin's receptor binding and vasoactivity.