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- W2092120184 abstract "S100B, an EF-hand calcium-binding protein composed of two S100beta monomers, undergoes a calcium-dependent conformational change that provides a surface for target interactions. In this study, the calcium-sensitive S100B-binding epitope TRTK-12 has been used to probe the contributions of the linker and C-terminal regions of S100B to protein-protein interactions. These contributions were quantified using C-terminal mutant S100B proteins lacking the C-terminal seven (S100B85stop) or nine (S100B83stop) residues or containing alanine substitutions at Phe87 (F87A), Phe88 (F88A), or both (F8788A). Both F8788A and F88A bound TRTK-12 less tightly (K(d) = 1.85 +/- 0.02 and 0.97 +/- 0.08 microM, respectively) than the wild-type protein (K(d) = 0.27 +/- 0.03 microM, DeltaG = -37.2 kJ/mol), indicating these residues are important for TRTK-12 interaction. The truncated S100B proteins bound TRTK-12 much more weakly (K(d) = 659.7 +/- 119.3 microM, DeltaG = -17.9 kJ/mol), indicating the linker region contributed about 50% to the binding of TRTK-12, while the C-terminus contributed the remaining 50% of the binding energy. Based on mutagenesis and NMR chemical shift studies, a comparison with known S100-target protein complexes showed the S100B-TRTK-12 complex has the strongest resemblance to the S100A10-annexin II interaction." @default.
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- W2092120184 date "2002-03-30" @default.
- W2092120184 modified "2023-10-18" @default.
- W2092120184 title "The C-Terminus and Linker Region of S100B Exert Dual Control on Protein−Protein Interactions with TRTK-12" @default.
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- W2092120184 doi "https://doi.org/10.1021/bi011732m" @default.
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