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Fernández-Sainz J, Pacheco-Liñán PJ, Granadino-Roldán JM, Bravo I, Garzón A, Rubio-Martínez J, Albaladejo J. Binding of the anticancer drug BI-2536 to human serum albumin. A spectroscopic and theoretical study. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2017; 172:77-87. [PMID: 28531794 DOI: 10.1016/j.jphotobiol.2017.05.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 05/03/2017] [Accepted: 05/11/2017] [Indexed: 01/30/2023]
Abstract
BI-2536 is a potent Polo-like kinase inhibitor which induces apoptosis in diverse human cancer cell lines. The binding affinity of BI-2536 for human serum albumin (HSA) protein may define its pharmacokinetic and pharmacodynamic profile. We have studied the binding of BI-2536 to HSA by means of different spectroscopic techniques and docking calculations. We have experimentally observed that the affinity of BI-2536 for HSA is higher than that of other common HSA binding drugs. Therefore, it can be postulated that the drug dose should be increased to achieve a certain concentration of free drug in plasma, although BI-2536 could also reach tumour tissues by uptaking HSA/BI-2536 complex. Only a single binding site on HSA has been observed for BI-2536 which seems to correspond to the subdomain IIA pocket. The formation of the HSA/BI-2536 complex is a spontaneous and entropy-driven process that does not cause a significant change of the secondary structure of the protein. Its endothermic character could be related to proton release. Thermodynamic analysis showed that the main protein-drug interactions are of the van der Waals type although the presence of amide and ether groups in BI-2536 could also allow H-bonding with some residues in the subdomain IIA pocket.
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Affiliation(s)
- Jesús Fernández-Sainz
- Departamento de Química Física, Facultad de Farmacia, Universidad de Castilla-La Mancha, Paseo de los Estudiantes, s/n, 02071 Albacete, Spain
| | - Pedro J Pacheco-Liñán
- Departamento de Química Física, Facultad de Farmacia, Universidad de Castilla-La Mancha, Paseo de los Estudiantes, s/n, 02071 Albacete, Spain
| | - José M Granadino-Roldán
- Departamento de Química Física y Analítica, Facultad de Ciencias Experimentales, Universidad de Jaén, Campus "Las Lagunillas" s/n, 23071 Jaén, Spain
| | - Iván Bravo
- Departamento de Química Física, Facultad de Farmacia, Universidad de Castilla-La Mancha, Paseo de los Estudiantes, s/n, 02071 Albacete, Spain
| | - Andrés Garzón
- Departamento de Química Física, Facultad de Farmacia, Universidad de Castilla-La Mancha, Paseo de los Estudiantes, s/n, 02071 Albacete, Spain.
| | - Jaime Rubio-Martínez
- Departament de Química Física, Universitat de Barcelona (UB), Institut de Recerca en Quimica Teorica i Computacional (IQTCUB), Martí iFranqués 1, 08028 Barcelona, Spain
| | - José Albaladejo
- Departamento de Química Física, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Avenida Camilo José Cela, 10, 13071 Ciudad Real, Spain
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Garzón A, Bravo I, Carrión-Jiménez MR, Rubio-Moraga Á, Albaladejo J. Spectroscopic study on binding of gentisic acid to bovine serum albumin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 150:26-33. [PMID: 26010705 DOI: 10.1016/j.saa.2015.05.045] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Revised: 05/14/2015] [Accepted: 05/15/2015] [Indexed: 06/04/2023]
Abstract
The interaction of (gentisic acid) GA with (bovine serum albumin) BSA has been studied by different spectroscopic techniques. GA is a monoanionic specie at the working pH of 7.4, it was determined by combining UV-Vis absorption spectroscopy and theoretical calculations. A set of fluorescence quenching experiments at different temperatures was carried out employing the native fluorescence of BSA. A Stern-Volmer constant (KSV) of (2.07±0.12)×10(4) mol(-1) L and a binding constant (Ka) of (8.47±4.39)×10(3) were determined at 310 K. The static quenching caused by the BSA-GA complex formation seems to play a significant role in the overall quenching process. A single binding site on BSA for GA was observed. ΔH=-55.6±0.2 kJ mol(-1) and ΔS=-104.3±0.6 J mol(-1) K(-1) were determined in a set of experiments on the dependence of Ka with the temperature. The binding process is, therefore, spontaneous and enthalpy-driven. Van der Waals forces and hydrogen bonds could also play the major role in the binding mode. The secondary structure changes of BSA in the absence and presence of GA were studied by FTIR and UV-Vis absorption spectroscopy.
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Affiliation(s)
- Andrés Garzón
- Departamento de Química Física, Facultad de Farmacia, Universidad de Castilla-La Mancha, Paseo de los estudiantes, s/n, 02071 Albacete, Spain.
| | - Iván Bravo
- Departamento de Química Física, Facultad de Farmacia, Universidad de Castilla-La Mancha, Paseo de los estudiantes, s/n, 02071 Albacete, Spain
| | - M Rosario Carrión-Jiménez
- Departamento de Química Física, Facultad de Farmacia, Universidad de Castilla-La Mancha, Paseo de los estudiantes, s/n, 02071 Albacete, Spain
| | - Ángela Rubio-Moraga
- Instituto Botánico, Facultad de Farmacia, Universidad de Castilla-La Mancha, Paseo de los estudiantes, s/n, 02071 Albacete, Spain
| | - José Albaladejo
- Departamento de Química Física, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Avenida Camilo José Cela, 10, 13071 Ciudad Real, Spain
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Mei P, Liu Y, Zhang Y, Fu J, Sun X, Liu Y. Binding Studies of a Schiff Base Compound Containing a 1,2,4-Triazole Ring with Bovine Serum Albumin Using Spectroscopic Methods. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.201090319] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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