Quest for the Molecular Basis of Improved Selective Toxicity of <i>All-Trans</i> Isomers of Aromatic Heptaene Macrolide Antifungal Antibiotics
Three aromatic heptaene macrolide antifungal antibiotics, Candicidin D, Partricin A (Gedamycin) and Partricin B (Vacidin) were subjected to controlled <i>cis-trans</i><i>→ all trans</i> photochemical isomerization. The obtained <i>all-trans</i> isomers demonstrate...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-09-01
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| Series: | International Journal of Molecular Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1422-0067/22/18/10108 |
| Summary: | Three aromatic heptaene macrolide antifungal antibiotics, Candicidin D, Partricin A (Gedamycin) and Partricin B (Vacidin) were subjected to controlled <i>cis-trans</i><i>→ all trans</i> photochemical isomerization. The obtained <i>all-trans</i> isomers demonstrated substantially improved in vitro selective toxicity in the <i>Candida albicans</i> cells: human erythrocytes model. This effect was mainly due to the diminished hemotoxicity. The molecular modeling studies on interactions between original antibiotics and their photoisomers with ergosterol and cholesterol revealed some difference in free energy profiles of formation of binary antibiotic/sterol complexes in respective membrane environments. Moreover, different geometries of heptaene: sterol complexes and variations in polyene macrolide molecule alignment in cholesterol-and ergosterol-containing membranes were found. None of these effects are of the crucial importance for the observed improvement of selective toxicity of aromatic heptaene antifungals but each seems to provide a partial contribution. |
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| ISSN: | 1661-6596 1422-0067 |