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• W2071350260 abstract "Structural studies are part of a rational drug design program aimed at inhibiting the S100B−p53 interaction and restoring wild-type p53 function in malignant melanoma. To this end, structures of three compounds (SBi132, SBi1279, and SBi523) bound to Ca2+-S100B were determined by X-ray crystallography at 2.10 Å (Rfree = 0.257), 1.98 Å (Rfree = 0.281), and 1.90 Å (Rfree = 0.228) resolution, respectively. Upon comparison, SBi132, SBi279, and SBi523 were found to bind in distinct locations and orientations within the hydrophobic target binding pocket of Ca2+-S100B with minimal structural changes observed for the protein upon complex formation with each compound. Specifically, SBi132 binds nearby residues in loop 2 (His-42, Phe-43, and Leu-44) and helix 4 (Phe-76, Met-79, Ile-80, Ala-83, Cys-84, Phe-87, and Phe-88), whereas SBi523 interacts with a separate site defined by residues within loop 2 (Ser-41, His-42, Phe-43, Leu-44, Glu-45, and Glu-46) and one residue on helix 4 (Phe-87). The SBi279 binding site on Ca2+-S100B overlaps the SBi132 and SBi523 sites and contacts residues in both loop 2 (Ser-41, His-42, Phe-43, Leu-44, and Glu-45) and helix 4 (Ile-80, Ala-83, Cys-84, Phe-87, and Phe-88). NMR data, including saturation transfer difference (STD) and 15N backbone and 13C side chain chemical shift perturbations, were consistent with the X-ray crystal structures and demonstrated the relevance of all three small molecule−S100B complexes in solution. The discovery that SBi132, SBi279, and SBi523 bind to proximal sites on Ca2+-S100B could be useful for the development of a new class of molecule(s) that interacts with one or more of these binding sites simultaneously, thereby yielding novel tight binding inhibitors specific for blocking protein−protein interactions involving S100B." @default.
• W2071350260 created "2016-06-24" @default.
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• W2071350260 date "2009-06-15" @default.
• W2071350260 modified "2023-09-26" @default.
• W2071350260 title "Small Molecules Bound to Unique Sites in the Target Protein Binding Cleft of Calcium-Bound S100B As Characterized by Nuclear Magnetic Resonance and X-ray Crystallography" @default.
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• W2071350260 doi "https://doi.org/10.1021/bi9005754" @default.
• W2071350260 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2804263" @default.
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• W2071350260 hasPublicationYear "2009" @default.
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