Enzymatic condensation of dopamine and acetaldehyde: a salsolinol synthase from rat brain |
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Authors: | Xuechai Chen Abida Arshad Hong Qing Rui Wang Jianqing Lu and Yulin Deng |
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Institution: | (1) School of Life Science, Beijing Institute of Technology, Beijing, 100081, China;(2) Division of Neurology, College of Medicine, University of Saskatchewan, Saskatoon, SK, S7N5E4, Canada |
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Abstract: | Salsolinol (1-methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline; Sal) is structurally similar to 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine,
which is supposed to have a role in the development of Parkinson-like syndrome in both human and non-human subjects. In the
human brain, the amount of (R)-enantiomer of Sal is much higher than (S)-enantiomer, suggesting that a putative enzyme may participate in the synthesis of (R)-salsolinol, called (R)-salsolinol synthase. In this study, the (R)-salsolinol synthase activity in the condensation of dopamine and acetaldehyde was investigated in the crude extracts from
the brains of Sprague Dawley rats. Identification of the enzymatic reaction products and enzyme activity detection were achieved
by HPLC-electrochemical detection. The discovery of this enzyme activity in rat’s brain indicates the natural existence of
(R)-salsolinol synthase in the brains of humans and rats, and it is distributed in most brain regions of rat with higher activity
in soluble proteins extracted from striatum and substantia nigra. |
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