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Comparison of ligand-induced conformational changes and domain closure mechanisms, between prokaryotic and eukaryotic dehydroquinate synthases

Lookup NU author(s): Professor Alastair Hawkins


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Dehydroquinate synthase (DHQS) is a potential target for the development of novel broad-spectrum antimicrobial drugs, active against both prokaryotes and lower eukaryotes. Structures have been reported for Aspergillus nidulans DHQS (AnDHQS) in complexes with a range of ligands. Analysis of these AnDHQS structures showed that a large-scale domain movement occurs during the normal catalytic cycle, with a complex series of structural elements propagating substrate binding-induced conformational changes away from the active site to distal locations. Compared to corresponding fungal enzymes, DHQS from bacterial species are both mono-functional and significantly smaller. We have therefore determined the structure of Staphylococcus aureus DHQS (SaDHQS) in five liganded states, allowing comparison of ligand-induced conformational changes and mechanisms of domain closure between fungal and bacterial enzymes. This comparative analysis shows that substrate binding initiates a large-scale domain closure in both species' DHQS and that the active site stereochemistry, of the catalytically competent closed-form enzyme thus produced, is also highly conserved. However, comparison of AnDHQS and SaDHQS open-form structures, and analysis of the putative dynamic processes by which the transition to the closed-form states are made, shows a far lower degree of similarity, indicating a significant structural divergence. As a result, both the nature of the propagation of conformational change and the mechanical systems involved in this propagation are quite different between the DHQSs from the two species. (C) 2004 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Nichols CE, Ren J, Leslie K, Dhaliwal B, Lockyer M, Charles I, Hawkins AR, Stammers DK

Publication type: Article

Publication status: Published

Journal: Journal of Molecular Biology

Year: 2004

Volume: 343

Issue: 3

Pages: 533-546

ISSN (print): 0022-2836

ISSN (electronic): 1089-8638

Publisher: Academic Press


DOI: 10.1016/j.jmb.2004.08.039


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