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In this contribution, a new complex containing two differently protonated PLITSC ligands ([Fe(PLITSC\u2013H)(PLITSC)]SO4)\u22192.5H2O was obtained. The crystal structure was solved by the X-ray analysis and used further for the optimization at B3LYP\/6-311++G(d,p)(H,C,N,O,S)\/def2-TZVP(Fe) level of theory. Changes in the interaction strength and bond distance due to protonation were observed upon examination by the Quantum Theory of Atoms in Molecules. The protein binding affinity of [Fe(PLITSC\u2013H)(PLITSC)]SO4 towards transport proteins (Bovine Serum Albumin (BSA) and Human Serum Albumin (HSA)) was investigated by the spectrofluorimetric titration and molecular docking. The interactions with the active pocket containing fluorescent amino acids were examined in detail, which explained the fluorescence quenching. The interactions between complex and DNA were followed by the ethidium-bromide displacement titration and molecular docking. The binding along the minor groove was the dominant process involving complex in the proximity of DNA.<\/jats:p>","DOI":"10.3390\/ijms25137058","type":"journal-article","created":{"date-parts":[[2024,6,27]],"date-time":"2024-06-27T11:19:02Z","timestamp":1719487142000},"page":"7058","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Crystal Structure, Theoretical Analysis, and Protein\/DNA Binding Activity of Iron(III) Complex Containing Differently Protonated Pyridoxal\u2013S-Methyl-Isothiosemicarbazone Ligands"],"prefix":"10.3390","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2180-8303","authenticated-orcid":false,"given":"Violeta","family":"Jevtovic","sequence":"first","affiliation":[{"name":"Department of Chemistry, College of Science, University Ha\u2019il, Ha\u2019il 81451, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luka","family":"Golubovi\u0107","sequence":"additional","affiliation":[{"name":"Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11000 Belgrade, Serbia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Badriah","family":"Alshammari","sequence":"additional","affiliation":[{"name":"Department of Chemistry, College of Science, University Ha\u2019il, Ha\u2019il 81451, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maha Raghyan","family":"Alshammari","sequence":"additional","affiliation":[{"name":"Department of Chemistry, College of Science, University Ha\u2019il, Ha\u2019il 81451, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-2658-5125","authenticated-orcid":false,"given":"Sahar Y.","family":"Rajeh","sequence":"additional","affiliation":[{"name":"Department of Chemistry, College of Science, University Ha\u2019il, Ha\u2019il 81451, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-9232-1839","authenticated-orcid":false,"given":"Maha Awjan","family":"Alreshidi","sequence":"additional","affiliation":[{"name":"Department of Chemistry, College of Science, University Ha\u2019il, Ha\u2019il 81451, Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1176-7103","authenticated-orcid":false,"given":"Odeh A. 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