2iv0

Thermal stability of isocitrate dehydrogenase from Archaeoglobus fulgidus studied by crystal structure analysis and engineering of chimers

spinqualitylabelsall models 2iv0, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2iv0 is a 2 chain structure with sequence from Arcfl. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, ZN Activity: Isocitrate dehydrogenase (NADP(+)), with EC number 1.1.1.42 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 Isocitrate dehydrogenase from Archaeoglobus fulgidus (AfIDH) has an apparent melting temperature (T(m)) of 98.5 degrees C. To identify the structural features involved in thermal stabilization of AfIDH, the structure was solved to 2.5 A resolution. AfIDH was strikingly similar to mesophilic IDH from Escherichia coli (EcIDH) and displayed almost the same number of ion pairs and ionic networks. However, two unique inter-domain networks were present in AfIDH; one three-membered ionic network between the large and the small domain and one four-membered ionic network between the clasp and the small domain. The latter ionic network was presumably reduced in size when the clasp domain of AfIDH was swapped with that of EcIDH and the T (m) decreased by 18 degrees C. Contrarily, EcIDH was only stabilized by 4 degrees C by the clasp domain of AfIDH, a result probably due to the introduction of a unique inter-subunit aromatic cluster in AfIDH that may strengthen the dimeric interface in this enzyme. A unique aromatic cluster was identified close to the N-terminus of AfIDH that could provide additional stabilization of this region. Common and unique heat adaptive traits of AfIDH with those recently observed for hyperthermophilic IDH from Aeropyrum pernix (ApIDH) and Thermotoga maritima (TmIDH) are discussed herein. Thermal stability of isocitrate dehydrogenase from Archaeoglobus fulgidus studied by crystal structure analysis and engineering of chimers.,Stokke R, Karlstrom M, Yang N, Leiros I, Ladenstein R, Birkeland NK, Steen IH Extremophiles. 2007 May;11(3):481-93. Epub 2007 Mar 31. PMID:17401542 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Isocitrate dehydrogenase 3D structures

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