The structure of Saccharomyces cerevisiae Met8p, a bifunctional dehydrogenase and ferrochelatase.

Schubert, Heidi L. and Raux-Deery, Evelyne and Brindley, Amanda A. and Leech, Helen K. and Wilson, Keith S. and Hill, Christopher P. and Warren, Martin J. (2002) The structure of Saccharomyces cerevisiae Met8p, a bifunctional dehydrogenase and ferrochelatase. EMBO Journal, 21 (9). pp. 2068-2075. (Access to this publication is restricted)

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Abstract

Sirohaem is a tetrapyrrole-derived prosthetic group that is required for the essential assimilation of sulfur and nitrogen into all living systems as part of the sulfite and nitrite reductase systems. The final two steps in the biosynthesis of sirohaem involve a beta-NAD(+)-dependent dehydrogenation of precorrin-2 to generate sirohydrochlorin followed by ferrochelation to yield sirohaem. In Saccharomyces cerevisiae, Met8p is a bifunctional enzyme that carries out both of these reactions. Here, we report the 2.2 A resolution crystal structure of Met8p, which adopts a novel fold that bears no resemblance to the previously determined structures of cobalt- or ferro-chelatases. Analysis of mutant proteins suggests that both catalytic activities share a single active site, and that Asp141 plays an essential role in both dehydrogenase and chelatase processes.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences > Protein Science Group
Depositing User: Sue Davies
Date Deposited: 19 Dec 2007 17:53
Last Modified: 17 Jul 2014 13:30
Resource URI: http://kar.kent.ac.uk/id/eprint/71 (The current URI for this page, for reference purposes)
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