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• W2000453957 abstract "S100A13 is a homodimeric protein that belongs to the S100 subfamily of EF-hand Ca2+-binding proteins. S100A13 exhibits unique physical and functional properties not observed in other members of the S100 family. S100A13 is crucial for the non-classical export of acidic fibroblast growth factors (FGFs-1), which lack signal peptide at their N-terminal end. In the present study, we report the three-dimensional solution structure of Ca2+-bound S100A13 using a variety of 3D NMR experiments. The structure of S100A13 is globular with four helices and an antiparallel β-sheet in each subunit. The dimer interface is formed mainly by an antiparallel arrangement of helices H1, H1′, H4, and H4′. Isothermal titration calorimetry (ITC) experiments show that S100A13 binds non-cooperatively to four calcium ions. Prominent differences exist between the three-dimensional structures of S100A13 and other S100 proteins. The hydrophobic pocket that largely contributes to protein–protein interactions in other S100 proteins is absent in S100A13. The structure of S100A13 is characterized by a large patch of negatively charged residues flanked by dense cationic clusters contributed largely by the positively charged residues located at the C-terminal end. Results of ITC experiments reveal that S100A13 lacking the C-terminal segment (residues 88–98) fails to bind FGF-1. The three-dimensional structure of S100A13 not only provides useful clues on its role in the non-classical export of signal peptide-less proteins such as FGF-1 but also paves the way for rational design of drugs against FGF-induced tumors." @default.
• W2000453957 created "2016-06-24" @default.
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• W2000453957 date "2005-10-01" @default.
• W2000453957 modified "2023-09-27" @default.
• W2000453957 title "Three-dimensional solution structure of a unique S100 protein" @default.
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• W2000453957 doi "https://doi.org/10.1016/j.bbrc.2005.08.005" @default.
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