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A kainic acid receptor from frog brain purified using domoic acid affinity chromatography
1Laboratory of Neuro-otolaryngology, National Institute of Neurological and Communicative Disorders and Stroke, Bethesda, Maryland 20892.
The Journal of Biological Chemistry
|February 15, 1988
Summary
Researchers purified a kainic acid receptor from frog brains using ion exchange and affinity chromatography. This highly purified receptor retained its binding properties, indicating successful isolation of the functional protein.
Area of Science:
- Neuroscience
- Biochemistry
- Molecular Biology
Background:
- Kainic acid receptors are crucial ionotropic glutamate receptors involved in neurotransmission.
- Understanding their structure and function requires purified receptor preparations.
Purpose of the Study:
- To purify and characterize the kainic acid receptor from frog brain membranes.
- To confirm the binding characteristics and molecular properties of the purified receptor.
Main Methods:
- Solubilization of frog brain membranes using Triton X-100/digitonin.
- Purification via DEAE-Sepharose CL-6B ion exchange chromatography.
- Affinity chromatography using domoic acid immobilized on Sepharose 4B.
- Scatchard analysis, gel filtration, and SDS-PAGE for characterization.
Main Results:
- Achieved a 481-fold increase in specific binding activity compared to crude solubilized preparations.
- Scatchard analysis revealed a two-site binding model with dissociation constants of 5.5 nM and 34 nM.
- Gel filtration indicated a Mr of 570,000, while SDS-PAGE showed a Mr of 48,000 for the purified receptor.
Conclusions:
- Successfully purified a functional kainic acid receptor from frog brain.
- The purified receptor exhibits high affinity binding and molecular characteristics consistent with its native state.
- This purified preparation is suitable for further detailed structural and functional studies.