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Structure of photosynthetic glyceraldehyde‐3‐phosphate dehydrogenase (isoform A4) from Arabidopsis thaliana in complex with NAD

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The crystal structure of the A 4 isoform of photosynthetic glyceraldehyde‐3‐phosphate dehydrogenase (GAPDH) from Arabidopsis thaliana, expressed in recombinant form and complexed with NAD, is reported. The crystals, which were grown in 2.4 M ammonium sulfate and 0.1 M sodium citrate, belonged to space group I222. The asymmetric unit includes ten subunits, i.e. two independent tetramers plus a dimer that generates a third tetramer by a crystallographic symmetry operation. The crystal structure was solved by molecular replacement and refined to an R factor of 23.7% and an R free factor of 28.9% at 2.6 Å resolution. In the final model, each subunit binds one NAD+ molecule and two sulfates, which occupy the Ps and the Pi anion‐binding sites. Detailed knowledge of this structure is instrumental for structural investigation of supramolecular complexes of A 4‐GAPDH, phosphoribulokinase and CP12, which are involved in the regulation of photosynthesis in the model plant A. thaliana.
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Keywords: Arabidopsis thaliana; glyceraldehyde‐3‐phosphate dehydrogenase

Document Type: Research Article

Publication date: June 1, 2010

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