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Protein slow motions are associated with structural heterogeneity, short-lived and poorly populated conformations, hard to detect individually. In addition, they involve collective motions of many atoms, not easily tracked by simulation and experimental devices. Here we propose a biophysical approach, coupling geometrical nanoconfinement and broadband dielectric spectroscopy (BDS), which distinguishes protein conformations by their respective molecular dynamics. In particular, protein-unfolding intermediates, usually poorly populated in macroscopic solutions are detected. The protein dynamics is observed under unusual conditions (sample nanoconfinement and dehydration) highlighting the robustness of protein structure and protein dynamics to a variety of conditions consistent with protein sustainability. The protein dielectric signals evolve with the temperature of thermal treatments indicating sensitivity to atomic and molecular interaction changes triggered by the protein thermal unfolding. As dipole fluctuations depend on both collective large-scale motions and local motions, the approach offers a prospect to track in-depth unfolding events.<\/jats:p>","DOI":"10.1038\/s41598-019-54562-8","type":"journal-article","created":{"date-parts":[[2019,11,29]],"date-time":"2019-11-29T11:02:41Z","timestamp":1575025361000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Experimental Protein Molecular Dynamics: Broadband Dielectric Spectroscopy coupled with nanoconfinement"],"prefix":"10.1038","volume":"9","author":[{"given":"La\u00ebtitia","family":"Bourgeat","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anatoli","family":"Serghei","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9594-014X","authenticated-orcid":false,"given":"Claire","family":"Lesieur","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,11,29]]},"reference":[{"key":"54562_CR1","doi-asserted-by":"publisher","first-page":"517","DOI":"10.1126\/science.1208351","volume":"334","author":"K Lindorff-Larsen","year":"2011","unstructured":"Lindorff-Larsen, K., Piana, S., Dror, R. 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