Thermodynamic and structural investigation of the interaction of quaternized 2,3-octakis-[(2-mercaptopyridine)phthalocyaninato] copper (II) sulfate (CuPc) with parallel and hybrid type G-quadruplex

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dc.contributor.authorSahin, Gamze
dc.contributor.authorBagda, Esra
dc.contributor.authorTemiz, Ozge Goktug
dc.contributor.authorBagda, Efkan
dc.contributor.authorAyhan, Ebubekir
dc.contributor.authorDurmus, Mahmut
dc.date.accessioned2024-10-26T18:05:41Z
dc.date.available2024-10-26T18:05:41Z
dc.date.issued2024
dc.departmentSivas Cumhuriyet Üniversitesi
dc.description.abstractG-quadruplexes are important drug targets and get attention due to their existence in telomere, ribosomal DNA, promoter regions of some oncogenes, and the untranslated regions of mRNA. Due to the biological roles of G-quadruplexes, investigating of the G-quadruplex-small molecule interaction is essential. The primary motivation for these studies is the possibility of inhibiting cell functions associated with G-quadruplex sequences by binding with small molecules. Targeting the small molecules to desired tissue with the G-quadruplex vehicles is the second important goal of the G-quadruplex-small molecule interaction studies. In the present study, the new peripherally 2-mercaptopyridine octasubstituted copper(II) phthalocyanine and its quaternized derivative (CuPc) were synthesized and characterized by elemental analysis FT-IR, UV-Vis, and mass spectra. The excellent solubility of CuPc in water is essential for its transport in the organism. Because of this feature, its affinity toward G-quadruplex forming aptamers, AS1411, Tel21, and Tel45, was investigated. The UV-Vis spectrophotometric titration data confirmed the prevention of aggregation upon interaction with G-quadruplex, which is very important for biomedical applications. The CD spectroscopic analyses and binding stoichiometry confirmed the end stacking model for interaction of AS1411 with CuPc. The interaction of CuPc caused the equilibrium shift from hybrid conformation to antiparallel conformation for Tel21 and Tel45. The isothermal titration calorimeter (ITC) was used for the determination of thermodynamic parameters. The thermodynamic data of the interaction was fitted well with the one-site model. The negative values of Gibbs free energy change confirmed the spontaneous nature of the reactions. Besides, the negative values of enthalpy change and entropy change proved that the nature of processes was enthalpy driven. The interaction stoichiometry was 2 for AS1411 and Tel21 and 1.5 for Tel45. The binding constants were 1.3(+/- 0.3) x 10(5), 3.2(+/- 0.4) x 10(5), and 1.1(+/- 0.3) x 10(5) M-1, which were at the level of ethidium bromide intercalation binding constant given in the literature. The DNA polymerase stop assay further supported the interaction of CuPc with G-quadruplex DNA. The experimental results confirm that the CuPc has a potential photosensitizer behaviour for photodynamic therapy.
dc.description.sponsorshipSivas Cumhuriyet Universitesi
dc.description.sponsorshipSivas Cumhuriyet Universitesi
dc.identifier.doi10.1002/jmr.3072
dc.identifier.issn0952-3499
dc.identifier.issn1099-1352
dc.identifier.issue2
dc.identifier.pmid38126580
dc.identifier.scopus2-s2.0-85180176705
dc.identifier.scopusqualityQ4
dc.identifier.urihttps://doi.org/10.1002/jmr.3072
dc.identifier.urihttps://hdl.handle.net/20.500.12418/29133
dc.identifier.volume37
dc.identifier.wosWOS:001130127300001
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.indekslendigikaynakPubMed
dc.language.isoen
dc.publisherWiley
dc.relation.ispartofJournal of Molecular Recognition
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectAS1411
dc.subjectcircular dichroism spectroscopy
dc.subjectG-quadruplex
dc.subjectisothermal titration calorimeter
dc.subjectphthalocyanine
dc.subjectTel21
dc.subjectTel45
dc.titleThermodynamic and structural investigation of the interaction of quaternized 2,3-octakis-[(2-mercaptopyridine)phthalocyaninato] copper (II) sulfate (CuPc) with parallel and hybrid type G-quadruplex
dc.typeArticle

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