2kqu | pdb_00002kqu

F98N apoflavodoxin from Anabaena PCC 7119

spinqualitylabelsall models 2kqu, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2kqu is a 1 chain structure with sequence from Anabaena pcc7119. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Related: 1ftg Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Function [FLAV_NOSSO] Low-potential electron donor to a number of redox enzymes. 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 Partly unfolded protein conformations close to the native state may play important roles in protein function and in protein misfolding. Structural analyses of such conformations which are essential for their fully physicochemical understanding are complicated by their characteristic low populations at equilibrium. We stabilize here with a single mutation the equilibrium intermediate of apoflavodoxin thermal unfolding and determine its solution structure by NMR. It consists of a large native region identical with that observed in the X-ray structure of the wild-type protein plus an unfolded region. Small-angle X-ray scattering analysis indicates that the calculated ensemble of structures is consistent with the actual degree of expansion of the intermediate. The unfolded region encompasses discontinuous sequence segments that cluster in the 3D structure of the native protein forming the FMN cofactor binding loops and the binding site of a variety of partner proteins. Analysis of the apoflavodoxin inner interfaces reveals that those becoming destabilized in the intermediate are more polar than other inner interfaces of the protein. Natively folded proteins contain hydrophobic cores formed by the packing of hydrophobic surfaces, while natively unfolded proteins are rich in polar residues. The structure of the apoflavodoxin thermal intermediate suggests that the regions of natively folded proteins that are easily responsive to thermal activation may contain cores of intermediate hydrophobicity. Design and structure of an equilibrium protein folding intermediate: a hint into dynamical regions of proteins.,Ayuso-Tejedor S, Angarica VE, Bueno M, Campos LA, Abian O, Bernado P, Sancho J, Jimenez MA J Mol Biol. 2010 Jul 23;400(4):922-34. Epub 2010 May 27. PMID:20553732 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Flavodoxin

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