Related Experiment Videos
Crystal structure of dimeric human ciliary neurotrophic factor determined by MAD phasing
N Q McDonald1, N Panayotatos, W A Hendrickson
1Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA.
The EMBO Journal
|June 15, 1995
Summary
Ciliary neurotrophic factor (CNTF) is crucial for motor neuron development and has therapeutic potential. Its crystal structure reveals a novel dimeric arrangement, offering insights into receptor interactions for neurodegenerative disease treatments.
Area of Science:
- Neuroscience
- Structural Biology
- Biochemistry
Background:
- Ciliary neurotrophic factor (CNTF) supports motor neuron survival and differentiation.
- CNTF is a potential therapeutic agent for neurodegeneration and nerve injury.
- Understanding CNTF's structure is key to its therapeutic applications.
Purpose of the Study:
- Determine the high-resolution crystal structure of human CNTF.
- Investigate the structural basis of CNTF dimerization.
- Identify potential receptor-binding sites on CNTF.
Main Methods:
- X-ray crystallography at 2.4 A resolution.
- Multi-wavelength anomalous diffraction (MAD) phasing using Yb3+ ions.
- Analysis of electrostatic surface potentials.
- Solution experiments to study dimerization.
Main Results:
- The crystal structure of human CNTF was determined, revealing a dimeric structure.
- CNTF exhibits a novel anti-parallel arrangement of subunits, not seen in other cytokines.
- Each subunit has a double crossover four-helix bundle fold with kinked helices.
- Electrostatic analysis suggests specific residues in kinked helices may interact with the CNTF receptor-alpha.
- CNTF dimerizes in solution at concentrations above 40 microM.
Conclusions:
- The determined CNTF structure provides a novel view of cytokine architecture.
- The dimeric form may be relevant for CNTF storage in peripheral nerves.
- The structural findings offer insights into CNTF-receptor interactions, potentially guiding therapeutic development.