Interaction of MnTOEtPyP4 porphyrin with DNA
The binding of water-soluble meso-tetra-(4N-oxyethylpyridyl) porphyrin (H 2 TOEtPyP4) and its manganese (III) derivative (MnTOEtPyP4) with calf thymus DNA have been quantitatively studied using UV/Vis spectrophotometry, Circular Dichroism (CD), thermal melting curves and viscometry. The results show...
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| Published in: | Journal of biomolecular structure & dynamics Vol. 41; no. 15; pp. 7290 - 7296 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
England
Taylor & Francis
13-10-2023
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | The binding of water-soluble meso-tetra-(4N-oxyethylpyridyl) porphyrin (H
2
TOEtPyP4) and its manganese (III) derivative (MnTOEtPyP4) with calf thymus DNA have been quantitatively studied using UV/Vis spectrophotometry, Circular Dichroism (CD), thermal melting curves and viscometry. The results show, that porphyrins interact with DNA via one binding mode at low relative concentrations (r) and two binding modes at high values of r. The binding constant (K
b
) and stoichiometry (n) were determined from binding isotherms for both porphyrin-DNA complexes. The thermal melting analysis indicates that the double-helical structure of DNA molecules is stabilizing in presence of studied porphyrins. At certain concentrations of porphyrin, two-stage melting curves were observed, which indicates the existence of two different binding modes. Obtained results show that MnTOEtPyP4 associates with DNA duplex via outside binding mode.
Communicated by Ramaswamy H. Sarma
The interaction of cationic water-soluble meso-tetra-(4N-hydroxyethylpyridyl) porphyrin and its Mn-containing derivative with DNA. |
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| Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 0739-1102 1538-0254 |
| DOI: | 10.1080/07391102.2022.2120076 |