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We have recently investigated their effect on ataxin\u20103 (AT3), the polyglutamine\u2010containing protein responsible for spinocerebellar ataxia type\u20053. We previously showed that EGCG and tetracycline can contrast the aggregation process and toxicity of expanded AT3, although by different mechanisms. Here, we have performed further experiments by using the sole Josephin domain (JD) to further elucidate the mechanism of action of the two compounds. By protein solubility assays and FTIR spectroscopy we have first observed that EGCG and tetracycline affect the JD aggregation essentially in the same way displayed when acting on the full\u2010length expanded AT3. Then, by saturation transfer difference (STD) NMR experiments, we have shown that EGCG binds both the monomeric and the oligomeric JD form, whereas tetracycline can only interact with the oligomeric one. Surface plasmon resonance (SPR) analysis has confirmed the capability of the sole EGCG to bind monomeric JD, although with a <jats:italic>K<\/jats:italic><jats:sub>D<\/jats:sub> value suggestive for a non\u2010specific interaction. Our investigations provide new details on the JD interaction with EGCG and tetracycline, which could explain the different mechanisms by which the two compounds reduce the toxicity of AT3.<\/jats:p>","DOI":"10.1002\/chem.201503086","type":"journal-article","created":{"date-parts":[[2015,11,5]],"date-time":"2015-11-05T07:27:33Z","timestamp":1446708453000},"page":"18383-18393","source":"Crossref","is-referenced-by-count":21,"title":["How Epigallocatechin\u20103\u2010gallate and Tetracycline Interact with the Josephin Domain of Ataxin\u20103 and Alter Its Aggregation 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