3jyq | pdb_00003jyq

Quinate dehydrogenase from Corynebacterium glutamicum in complex with shikimate and NADH

spinqualitylabelsall models 3jyq, resolution 1.16Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3jyq is a 1 chain structure with sequence from Corgl. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NAD, SKM Related: 2nlo, 3jyo, 3jyp Gene: aroE, cg0504, Cgl0424 (CORGL) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [AROE_CORGL] Catalyzes the NAD(+)-dependent oxidation of both quinate and shikimate to 3-dehydroquinate and 3-dehydroshikimate, respectively. Seems to play a key role in the quinate degradation pathway. Publication Abstract from PubMed Abstract Quinate dehydrogenase (QDH) catalyzes the reversible oxidation of quinate to 3-dehydroquinate by NADH and is involved in the catabolic quinate metabolism required for the degradation of lignin. The enzyme is a member of the family of shikimate/quinate dehydrogenases (SDH/QDH) occurring in bacteria and plants. We characterized the dual-substrate quinate/shikimate dehydrogenase QSDH from Corynebacterium glutamicum (CglQSDH) kinetically and revealed a clear substrate preference of CglQSDH for quinate compared to shikimate both at the pH-optimum and in a physiological pH-range, which is a remarkable contrast to closely related SDH/QDH enzymes. With respect to the cosubstrate CglQSDH is strictly NAD(H) dependent. These substrate and cosubstrate profiles correlate nicely to the details of three atomic resolution crystal structures of CglQSDH in different functional states we report here: with bound NAD+ (binary complex) and as ternary complexes with NADH plus either shikimate or quinate. The CglQSDH-NADH-quinate structure is the first complex structure of any member of the SDH/QDH family with quinate. Based on this novel structural information and systematic sequence and structure comparisons with closely related enzymes we can explain the strict NAD(H) dependency of CglQSDH as well as its discrimination between shikimate and quinate. Enzyme-substrate complexes of the quinate/shikimate dehydrogenase from Corynebacterium glutamicum enable new insights in substrate and cofactor binding, specificity and discrimination.,Hoppner A, Schomburg D, Niefind K Biol Chem. 2013 Aug 8. pii:, /j/bchm.just-accepted/hsz-2013-0170/hsz-2013-0170.xml. doi:, 10.1515/hsz-2013-0170. PMID:23929881 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Shikimate dehydrogenase

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