Isolation and identification of succinic semialdehyde dehydrogenase inhibitory compound from the rhizome ofGastrodia elata blume
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In our search for the anticonvulsant constituent ofGastrodia elata repeated column chromatographies guided by activity assay led to isolation of an active compound, which was identified as gastrodin on the basis of spectral data. Brain succinic semialdehyde dehydrogenase (SSADH) was inactivated by preincubation with gastrodin in a time-dependent manner and the reaction was monitored by absorption and fluorescence spectroscopic methods. The inactivation followed pseudo-first-order kinetics with the second-rate order constant of 1.2×103 M−1 min−1. The time course of the reaction was significantly affected by the coenzyme NAD+, which affected complete protection against the loss of the catalytic activity, whereas substrate succinic semialdehyde failed to prevent the inactivation of the enzyme. It is postulated that the gastrodin is able to elevate the neurotransmitter GABA levels in central nervous system by inhibitory action on one of the GABA degradative enzymes, SSADH.
Key wordsGastrodia elata Anticonvulsant Gastrodin Brain GABA shunt Succinic semialdehyde dehydrogenase
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- Huang, J. Comparison studies on pharmacological properties of injection Gastrodia elata gastrodin-free fraction and gastrodin,Acta. Adva. Med. Sinica, 11, 147–150 (1989).Google Scholar
- Huh, K., Yi, S.-J., Shin, U.-S. and Park, J.-M., Effect of the ether fraction on Gastrodia elata methanol extracts on the pentylenetetrazole-induces seizures.J. Appl. Pharmcology, 3, 199–204 (1995).Google Scholar
- Lee, B. R., Hong, J. W., Yoo, B. K., Lee, S. J., Cho, S.-W. and Choi, S.Y., Bovine brain succinic semialdehyde dehydrogenase; Purification, kinetics and reactivity of lysyl residues connected with catalytic activity,Mol. Cells, 5, 611–617 (1995).Google Scholar
- Ruan, D., Yang, C. and Pu, X., The quantitative analysis of phenols fromGastrodia elata and its related plants by HPLC,Acta. Bot. Yunnanica, 10, 231–237 (1988).Google Scholar
- Soka, T., Dictionary of Chinese Drugs, Shanghai Science Technology Shogaukan (Eds.), Shogakukan Press, Tokyo, pp. 1870–1873, 1985.Google Scholar
- Taguchi, H., Yosioka, I., Yamasaki, K. and Kim, I.H., Studies on the constituents ofGastrodia elata Blume,Chem. Pharm. Bull., 29, 55–62 (1981).Google Scholar
- Zhou, J., Yang, Y.B. and Pu, X.Y., Phenolic compounds of freshGastrodia elata, Acta. Bot. Yunnanica, 2, 370–372 (1980).Google Scholar