3n8k

Type II dehydroquinase from Mycobacterium tuberculosis complexed with citrazinic acid

spinqualitylabelsall models 3n8k, resolution 2.25Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3n8k is a 24 chain structure with sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.25Å Ligands: CL, D1X Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function AROQ_MYCTU Catalyzes a trans-dehydration via an enolate intermediate (By similarity).[HAMAP-Rule:MF_00169] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The shikimate pathway is essential in Mycobacterium tuberculosis and its absence in humans makes the enzymes of this pathway potential drug targets. In this report, we provide structural insights into ligand and inhibitor binding to 3-dehydroquinate dehydratase (dehydroquinase) from Mycobacterium tuberculosis (MtDHQase), the third enzyme of the shikimate pathway. The enzyme has been crystallized in complex with its reaction product, 3-dehydroshikimate, and with six different competitive inhibitors. The inhibitor 2,3-anhydroquinate mimics the flattened enol/enolate reaction intermediate and serves as an anchor molecule for four of the inhibitors investigated. MtDHQase also forms a complex with citrazinic acid, a planar analog of the reaction product. The structure of MtDHQase in complex with a 2,3-anhydroquinate moiety attached to a biaryl group shows that this group extends to an active site subpocket inducing significant structural re-arrangement. The flexible extensions of inhibitors designed to form pi-stacking interactions with the catalytic Tyr24 residue have been investigated. The high resolution crystal structures of the MtDHQase complexes provide structural evidence for the role of the loop residues 19-24 in MtDHQase ligand binding and catalytic mechanism and provide rationale for the design and efficacy of inhibitors. Structural investigation of inhibitor designs targeting 3-dehydroquinate dehydratase from the shikimate pathway of Mycobacterium tuberculosis.,Dias MV, Snee WC, Bromfield KM, Payne R, Palaninathan SK, Ciulli A, Howard NI, Abell C, Sacchettini JC, Blundell TL Biochem J. 2011 Mar 17. PMID:21410435 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Dehydroquinase 3D structures

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