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Indole oxygenase from the leaves of Tecoma stans

Kunapuli, SP and Vaidyanathanf, CS (1982) Indole oxygenase from the leaves of Tecoma stans. In: Plant Science Letters, 24 (2). pp. 183-188.

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A new indole oxygenase from the leaves of Tecoma stans was isolated and purified to near homogeneity. The purified enzyme system catalyses the conversion of indole to anthranilic acid. It is optimally active at pH 5.2 and at 30°C. Oxygen (2 mol) is consumed and anthranilic acid (1 mol) is formed for every mole of indole oxidized. Neither sulfhydryl reagents nor sulfhydryl compounds inhibited the enzyme activity. The oxygenase also attacks, apart from indole, 5-hydroxyindole, 5-bromoindole and 5-methylindole. It is not inhibited by copper specific chelators or non-heme iron specific chelators. Atebrin did not inhibit the enzyme activity suggesting that it is not a flavoprotein, unlike other indole oxygenases and indole oxidases. Dialysis resulted in complete loss of enzyme activity. The inactive enzyme could not be reactivated by addition of various cofactors.

Item Type: Journal Article
Publication: Plant Science Letters
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Department/Centre: Division of Biological Sciences > Biochemistry
Date Deposited: 28 Aug 2009 12:29
Last Modified: 19 Sep 2010 05:42
URI: http://eprints.iisc.ac.in/id/eprint/22583

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