2gq2
Mycobacterium tuberculosis ThyX-NADP complex
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OverviewOverview
The novel flavin-dependent thymidylate synthase, ThyX, is absent in humans, but several pathogenic bacteria depend exclusively on ThyX activity to, synthesize thymidylate. Reduction of the enzyme-bound FAD by NADPH is, suggested to be the critical first step in ThyX catalysis. We soaked, Mycobacterium tuberculosis ThyX-FAD-BrdUMP ternary complex crystals in a, solution containing NADP+ to gain structural insights into the reductive, step of the catalytic cycle. Surprisingly, the NADP+ displaced both FAD, and BrdUMP from the active site. In the resultant ThyX-NADP+ binary, complex, the AMP moiety is bound in a deep pocket similar to that of the, same moiety of FAD in the ternary complex, while the nicotinamide part of, NADP+ is engaged in a limited number of contacts with ThyX. The additional, 2'-phosphate group attached to the AMP ribose of NADP+ could be, accommodated with minor rearrangement of water molecules. The newly, introduced 2'-phosphate groups are engaged in water-mediated interactions, across the non-crystallographic 2-fold axis of the ThyX tetramer, suggesting possibilities for design of high-affinity bivalent inhibitors, of this intriguing enzyme.
About this StructureAbout this Structure
2GQ2 is a Single protein structure of sequence from Mycobacterium tuberculosis with IOD, K, NAP, PGE and GOL as ligands. Active as Thymidylate synthase (FAD), with EC number 2.1.1.148 Full crystallographic information is available from OCA.
ReferenceReference
NADP+ expels both the co-factor and a substrate analog from the Mycobacterium tuberculosis ThyX active site: opportunities for anti-bacterial drug design., Sampathkumar P, Turley S, Sibley CH, Hol WG, J Mol Biol. 2006 Jun 30;360(1):1-6. Epub 2006 May 12. PMID:16730023
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