Emissive enhancement of the singlet oxygen chemiluminescence probe after binding to bovine serum albumin

Miranda-Apodaca, J. ; Hananya, N. ; Velázquez-Campoy, A. (Universidad de Zaragoza) ; Shabat, D. ; Arellano, J.B.

Resumen: A chemiluminescence probe for singlet oxygen 1O2 (SOCL) was investigated in phosphate buffer saline (PBS), either in the absence of proteins or containing bovine serum albumin (BSA). In the protein-free PBS, the reactivity of SOCL for methylene blue (MB)-photosensitized 1O2 was found to be moderate or low. The reaction yield increased with temperature and/or concentration of dissolved molecular oxygen. Unexpectedly, the presence of BSA boosted both the emissive nature and the thermal stability of the phenoxy-dioxetane intermediate formed in the chemiexcitation pathway. Isothermal titration calorimetry showed that SOCL has a moderate binding affinity for BSA and that entropy forces drive the formation of the SOCL-BSA complex. A model with two identical and independent binding sites was used to fit the binding isotherm data. Co-operative binding was observed when MB was present. Local viscosity factors and/or conformational restrictions of the BSA-bound SOCL phenoxy-dioxetane were proposed to contribute to the formation of the highly emissive benzoate ester during the chemically initiated electron exchange luminescence (CIEEL) process. These results led us to conclude that hydrophobic interactions of the SOCL with proteins can modify the emissive nature of its phenoxy-dioxetane, which should be taken into account when using SOCL or its cell-penetrating peptide derivative in living cells.

Idioma: Inglés

DOI: 10.3390/molecules24132422

Año: 2019

Publicado en: Molecules 24, 13 (2019), 2422 [16 pp]
ISSN: 1420-3049

Factor impacto JCR: 3.267 (2019)

Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 70 / 177 = 0.395 (2019) - Q2 - T2
Categ. JCR: BIOCHEMISTRY & MOLECULAR BIOLOGY rank: 141 / 297 = 0.475 (2019) - Q2 - T2

Factor impacto SCIMAGO: 0.698 - Pharmaceutical Science (Q1) - Chemistry (miscellaneous) (Q2) - Drug Discovery (Q2) - Physical and Theoretical Chemistry (Q2) - Organic Chemistry (Q2) - Analytical Chemistry (Q2) - Medicine (miscellaneous) (Q2) - Molecular Medicine (Q3)

Financiación: info:eu-repo/grantAgreement/ES/MICINN/AGL2016-79589-R
Financiación: info:eu-repo/grantAgreement/ES/MICINN/BFU2007-68107-C02-02/BMC
Financiación: info:eu-repo/grantAgreement/ES/MICINN/RTC-2017-6756-2

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Bioquímica y Biolog.Mole. (Dpto. Bioq.Biolog.Mol. Celular)