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Here, we have applied this method to explore the solution chemistry of human carbonic anhydrase I (hCA I) and its interactions with four different inhibitors, namely three sulfonamide inhibitors (AAZ, MZA, SLC-0111) and the dithiocarbamate derivative of morpholine (DTC). Through high-resolution ESI-Q-TOF measurements, the native state of hCA I and the binding of the above inhibitors were characterized in the molecular detail. Native mass spectrometry was also exploited to assess the direct competition in solution among the various inhibitors in relation to their affinity constants. Additional studies were conducted on the interaction of hCA I with the metallodrug auranofin, under various solution and instrumental conditions. Auranofin is a selective reagent for solvent-accessible free cysteine residues, and its reactivity was analyzed also in the presence of CA inhibitors. Overall, our investigation reveals that native mass spectrometry represents an excellent tool to characterize the solution behavior of carbonic anhydrase.<\/jats:p>\n<\/jats:sec><jats:sec>\n<jats:title>Graphic abstract<\/jats:title>\n\n<\/jats:sec>","DOI":"10.1007\/s00775-020-01818-8","type":"journal-article","created":{"date-parts":[[2020,9,14]],"date-time":"2020-09-14T12:07:59Z","timestamp":1600085279000},"page":"979-993","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Native mass spectrometry of human carbonic anhydrase I and its inhibitor complexes"],"prefix":"10.1007","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4531-9379","authenticated-orcid":false,"given":"Carlotta","family":"Zoppi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3342-702X","authenticated-orcid":false,"given":"Alessio","family":"Nocentini","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4262-0323","authenticated-orcid":false,"given":"Claudiu T.","family":"Supuran","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9553-9943","authenticated-orcid":false,"given":"Alessandro","family":"Pratesi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9490-8014","authenticated-orcid":false,"given":"Luigi","family":"Messori","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,9,14]]},"reference":[{"key":"1818_CR1","doi-asserted-by":"publisher","first-page":"137","DOI":"10.1038\/153137a0","volume":"153","author":"J Fegler","year":"1944","unstructured":"Fegler J (1944) Function of carbonic anhydrase in blood. 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