Sandbox Reserved 1094

This Sandbox is Reserved from 25/11/2019, through 30/9/2020 for use in the course "Structural Biology" taught by Bruno Kieffer at the University of Strasbourg, ESBS. This reservation includes Sandbox Reserved 1091 through Sandbox Reserved 1115.

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Glucose-6-Phosphate Dehydrogenase from Leuconostoc mesenteroides

spinqualitylabelsall models Caption for this structure Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Function The Glucose-6-Phosphate Dehydrogenase is involved in the processing of carbohydrates as it has important roles in the glucose metabolic process (glycolysis and pentose phosphate pathway). It also has a role in protecting cells from destruction as it produces the co-factor NADPH which plays a role in protecting cells from reactive oxygen species . Genomic context It is coded by the G6PD gene (1461 nucleotides). Catalytic activity D-glucose 6-phosphate + NAD+ → 6-phospho-D-glucono-1,5-lactone + H+ + NADH KM=114 µM for G6PD (with NADP), KM=69 µM for G6PD (with NAD), KM=8.0 µM for NADP, KM=160 µM for NAD. Its regulation depends on the concentration of substrate and coenzyme, rate limiting step in pentose phosphate pathway. Optimal activity conditions Optimum pH is 5.4 - 8.9. Evolutionary conservation The different structures conserved evolutionary can be observed according to the scale following. Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Mutations Mutagenesis inducing catalytic activity loss: +200 mutations have been identified. A change of amino acids leads to disruption of the normal structure/function/reduce the expression of enzymes. Structural highlights It is formed of a homodimer, so a dimer of two identical monomers. Each monomer is composed of 2 domains, 1 red and 1 green. Depending on several conditions, it can dimerize to form tetramers. Each monomer in the complex has a substrate binding site that binds to G6P, and a catalytic coenzyme binding site that binds to NADP+/NADPH using the Rossman fold. This is a sample scene created with SAT to color by Group, and another to make a transparent representation of the protein. Y

References

3. Ravera S., Calzia D., Morelli A. et Panfoli I. 2010. Oligomerization studies of Leuconostoc mesenteroides G6PD activity after SDS-PAGE and blotting. Molekuliarnaia Biologiia. 44(3):472-6.

4. Cosgrove MS., Naylor C., Paludan S., Adams MJ. et Levy HR. 1998. On the mechanism of the reaction catalyzed by glucose 6-phosphate dehydrogenase. Biochemistry. 37(9):2759-67.

5. Cosgrove MS., Loh SN., Ha JH. et Levy HR. 2002. The catalytic mechanism of glucose 6-phosphate dehydrogenases: assignment and 1H NMR spectroscopy pH titration of the catalytic histidine residue in the 109 kDa Leuconostoc mesenteroides enzyme. Biochemistry. 41(22):6939-45.

6. Rowland P, Basak AK, Gover S, Levy HR, Adams MJ. The three-dimensional structure of glucose 6-phosphate dehydrogenase from Leuconostoc mesenteroides refined at 2.0 A resolution. Structure. 1994 Nov 15;2(11):1073-87.

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