6bmq

Crystal structure of Arabidopsis Dehydroquinate dehydratase-shikimate dehydrogenase (T381G mutant) in complex with tartrate and shikimate

spinqualitylabelsall models 6bmq, resolution 2.08Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6bmq is a 1 chain structure with sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.077Å Ligands: QIC, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DHQSD_ARATH Publication Abstract from PubMed Quinate is produced and used by many plants in the biosynthesis of chlorogenic acids (CGAs). Chlorogenic acids are astringent and serve to deter herbivory. They also function as antifungal agents and have potent antioxidant properties. Quinate is produced at a branch point of shikimate biosynthesis by the enzyme quinate dehydrogenase (QDH). However, little information exists on the identity and biochemical properties of plant QDHs. In this study, we utilized structural and bioinformatics approaches to establish a QDH-specific primary sequence motif. Using this motif, we identified QDHs from diverse plants and confirmed their activity by recombinant protein production and kinetic assays. Through a detailed phylogenetic analysis, we show that plant QDHs arose directly from bifunctional dehydroquinate dehydratase-shikimate dehydrogenases (DHQD-SDHs) through different convergent evolutionary events, illustrated by our findings that eudicot and conifer QDHs arose early in vascular plant evolution whereas Brassicaceae QDHs emerged later. This process of recurrent evolution of QDH is further demonstrated by the fact that this family of proteins independently evolved NAD(+) and NADP(+) specificity in eudicots. The acquisition of QDH activity by these proteins was accompanied by the inactivation or functional evolution of the DHQD domain, as verified by enzyme activity assays and as reflected in the loss of key DHQD active site residues. The implications of QDH activity and evolution are discussed in terms of plant growth and development. Structural and biochemical approaches uncover multiple evolutionary trajectories of plant quinate dehydrogenases.,Gritsunov A, Peek J, Diaz Caballero J, Guttman D, Christendat D Plant J. 2018 Jun 11. doi: 10.1111/tpj.13989. PMID:29890023 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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