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Chemical probes into the active centre of a heme thiolate monoxygenase

Bhattacharyya, PK and Samanta, TB and Ullah, AHJ and Gunsalus, IC (1984) Chemical probes into the active centre of a heme thiolate monoxygenase. In: Journal of Chemical Sciences, 93 (8). pp. 1289-1304.

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Official URL: http://www.springerlink.com/content/t333400t474223...


Linalool-8-monoxygenase, a typical bacterial P-450 heme thiolase, shows a high degree of substrate specificity towards linalool. The active site of the pure enzyme has been probed with a large number of substrate analogues with systematic alterations or conformational variations in the linalool molecule. The comparison of three parameters, the mo→mos conversion of the enzyme as a result of substrate binding monitored at 392 nm, theK D of the analogues giving information about energies of association and the relative turnover as substrate have given information about the space-filling characteristics of the substrates in the enzyme cleft, the number of contacts the molecules make with the respective domains of the enzyme and the distance of the site undergoing hydroxylation from the oxygen site, respectively. The data permit the conclusion that linalool makes contact with the enzyme by hydrogen bonding with the hydroxyl group as well through hydrophobic association with all the eight carbons carrying hydrogen in the molecules.

Item Type: Journal Article
Publication: Journal of Chemical Sciences
Publisher: Springer Link
Additional Information: Coyright of this article belongs to Springer.
Keywords: Enzymes; oxygenases;P-450 hydroxylases;structure of monooxygenase;substrate analogues;enzyme kinetics; intermolecular associations .
Department/Centre: Division of Chemical Sciences > Organic Chemistry
Date Deposited: 11 Aug 2009 09:46
Last Modified: 11 Aug 2009 09:46
URI: http://eprints.iisc.ac.in/id/eprint/22227

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