--- res: bibo_abstract: - Guanidinium (Gdm) undergoes interactions with both hydrophilic and hydrophobic groups and, thus, is a highly potent denaturant of biomolecular structure. However, our molecular understanding of the interaction of Gdm with proteins and DNA is still rather limited. Here, we investigated the denaturation of DNA origami nanostructures by three Gdm salts, i.e., guanidinium chloride (GdmCl), guanidinium sulfate (Gdm2SO4), and guanidinium thiocyanate (GdmSCN), at different temperatures and in dependence of incubation time. Using DNA origami nanostructures as sensors that translate small molecular transitions into nanostructural changes, the denaturing effects of the Gdm salts were directly visualized by atomic force microscopy. GdmSCN was the most potent DNA denaturant, which caused complete DNA origami denaturation at 50 °C already at a concentration of 2 M. Under such harsh conditions, denaturation occurred within the first 15 min of Gdm exposure, whereas much slower kinetics were observed for the more weakly denaturing salt Gdm2SO4 at 25 °C. Lastly, we observed a novel non-monotonous temperature dependence of DNA origami denaturation in Gdm2SO4 with the fraction of intact nanostructures having an intermediate minimum at about 40 °C. Our results, thus, provide further insights into the highly complex Gdm–DNA interaction and underscore the importance of the counteranion species.@eng bibo_authorlist: - foaf_Person: foaf_givenName: Marcel foaf_name: Hanke, Marcel foaf_surname: Hanke - foaf_Person: foaf_givenName: Niklas foaf_name: Hansen, Niklas foaf_surname: Hansen - foaf_Person: foaf_givenName: Emilia foaf_name: Tomm, Emilia foaf_surname: Tomm - foaf_Person: foaf_givenName: Guido foaf_name: Grundmeier, Guido foaf_surname: Grundmeier foaf_workInfoHomepage: http://www.librecat.org/personId=194 - foaf_Person: foaf_givenName: Adrian foaf_name: Keller, Adrian foaf_surname: Keller foaf_workInfoHomepage: http://www.librecat.org/personId=48864 orcid: 0000-0001-7139-3110 bibo_doi: 10.3390/ijms23158547 bibo_issue: '15' bibo_volume: 23 dct_date: 2022^xs_gYear dct_isPartOf: - http://id.crossref.org/issn/1422-0067 dct_language: eng dct_publisher: MDPI AG@ dct_subject: - Inorganic Chemistry - Organic Chemistry - Physical and Theoretical Chemistry - Computer Science Applications - Spectroscopy - Molecular Biology - General Medicine - Catalysis dct_title: Time-Dependent DNA Origami Denaturation by Guanidinium Chloride, Guanidinium Sulfate, and Guanidinium Thiocyanate@ ...