|
1
|
Florêncio E Silva E, Machado ES, Vasconcelos IB, Junior SA, L Dutra JD, Freire RO, da Costa NB. Are the Absorption Spectra of Doxorubicin Properly Described by Considering Different Tautomers? J Chem Inf Model 2020; 60:513-521. [PMID: 31833765 DOI: 10.1021/acs.jcim.9b00785] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The elucidation of the action of doxorubicin (DOX) has been considered a challenge for cancer therapy. Using theoretical approaches, we investigated the structure and electronic properties of DOX as a function of pH, which we thought likely to be related to the influence of its tautomers. Regarding the relative stabilities among the tautomers, the results obtained from PM6 were the most similar to those obtained from DFT. The theoretical absorption spectrum for each tautomeric species simply showed a single absorption peak located around 400 nm, in contrast to the experimental absorption spectra in the literature that showed four absorption bands. The experimental evidence was properly explained by considering four tautomeric conformers of DOX. The spectroscopic study of the deprotonated tautomers also suggested the presence of four deprotonated tautomers at more basic pH values. The spectrum at pH 10.08 can be explained by the presence of protonated and deprotonated doxorubicin species.
Collapse
Affiliation(s)
- Edvonaldo Florêncio E Silva
- Pople Computational Chemistry Laboratory, Departamento de Química, CCET , UFS , 49100-000 , São Cristóvão , Sergipe , Brazil
| | - Edna S Machado
- Pople Computational Chemistry Laboratory, Departamento de Química, CCET , UFS , 49100-000 , São Cristóvão , Sergipe , Brazil
| | - Iane B Vasconcelos
- Departamento de Química Fundamental, CCEN , UFPE , 50590-470 , Recife , Pernambuco , Brazil
| | - Severino A Junior
- Departamento de Química Fundamental, CCEN , UFPE , 50590-470 , Recife , Pernambuco , Brazil
| | - José Diogo L Dutra
- Pople Computational Chemistry Laboratory, Departamento de Química, CCET , UFS , 49100-000 , São Cristóvão , Sergipe , Brazil
| | - Ricardo O Freire
- Pople Computational Chemistry Laboratory, Departamento de Química, CCET , UFS , 49100-000 , São Cristóvão , Sergipe , Brazil
| | - Nivan B da Costa
- Pople Computational Chemistry Laboratory, Departamento de Química, CCET , UFS , 49100-000 , São Cristóvão , Sergipe , Brazil
| |
Collapse
|
|
2
|
Quantum polarized ligand docking investigation to understand the significance of protonation states in histone deacetylase inhibitors. J Mol Graph Model 2013; 44:44-53. [DOI: 10.1016/j.jmgm.2013.05.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 04/09/2013] [Accepted: 05/01/2013] [Indexed: 11/20/2022]
|