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Fluorescence and Docking Studies of the Interaction between Human Serum Albumin and Pheophytin.
Chaves, Otávio Augusto; Amorim, Ana Paula de O; Castro, Larissa H E; Sant'Anna, Carlos Mauricio R; de Oliveira, Márcia C C; Cesarin-Sobrinho, Dari; Netto-Ferreira, José Carlos; Ferreira, Aurélio B B.
Afiliación
  • Chaves OA; Departamento de Química, Universidade Federal Rural do Rio de Janeiro, BR 465, km 47, 23890-000 Seropédica-RJ, Brazil. otavio_ufrrj@hotmail.com.
  • Amorim AP; Departamento de Química, Universidade Federal Rural do Rio de Janeiro, BR 465, km 47, 23890-000 Seropédica-RJ, Brazil. anamorim16@gmail.com.
  • Castro LH; Departamento de Química, Universidade Federal Rural do Rio de Janeiro, BR 465, km 47, 23890-000 Seropédica-RJ, Brazil. larissa_hec@hotmail.com.
  • Sant'Anna CM; Departamento de Química, Universidade Federal Rural do Rio de Janeiro, BR 465, km 47, 23890-000 Seropédica-RJ, Brazil. santanna@ufrrj.br.
  • de Oliveira MC; Departamento de Química, Universidade Federal Rural do Rio de Janeiro, BR 465, km 47, 23890-000 Seropédica-RJ, Brazil. mccdeo@gmail.com.
  • Cesarin-Sobrinho D; Departamento de Química, Universidade Federal Rural do Rio de Janeiro, BR 465, km 47, 23890-000 Seropédica-RJ, Brazil. dari@ufrrj.br.
  • Netto-Ferreira JC; Departamento de Química, Universidade Federal Rural do Rio de Janeiro, BR 465, km 47, 23890-000 Seropédica-RJ, Brazil. jcnetto.ufrrj@gmail.com.
  • Ferreira AB; Instituto Nacional de Metrologia, Qualidade e Tecnologia-INMETRO, Divisão de Metrologia Química, 25250-020 Duque de Caxias-RJ, Brazil. jcnetto.ufrrj@gmail.com.
Molecules ; 20(10): 19526-39, 2015 Oct 27.
Article en En | MEDLINE | ID: mdl-26516829
In the North of Brazil (Pará and Amazonas states) the leaves of the plant Talinum triangulare (popular: cariru) replace spinach as food. From a phytochemical point of view, they are rich in compounds of the group of pheophytins. These substances, related to chlorophyll, have photophysical properties that give them potential application in photodynamic therapy. Human serum albumin (HSA) is one of the main endogenous vehicles for biodistribution of molecules by blood plasma. Association constants and thermodynamic parameters for the interaction of HSA with pheophytin from Talinum triangulare were studied by UV-Vis absorption, fluorescence techniques, and molecular modeling (docking). Fluorescence quenching of the HSA's internal fluorophore (tryptophan) at temperatures 296 K, 303 K, and 310 K, resulted in values for the association constants of the order of 104 L∙mol(-1), indicating a moderate interaction between the compound and the albumin. The negative values of ΔG° indicate a spontaneous process; ΔH° = 15.5 kJ∙mol(-1) indicates an endothermic process of association and ΔS° = 0.145 kJ∙mol(-1)∙K(-1) shows that the interaction between HSA and pheophytin occurs mainly by hydrophobic factors. The observed Trp fluorescence quenching is static: there is initial non-fluorescent association, in the ground state, HSA:Pheophytin. Possible solution obtained by a molecular docking study suggests that pheophytin is able to interact with HSA by means of hydrogen bonds with three lysine and one arginine residues, whereas the phytyl group is inserted in a hydrophobic pocket, close to Trp-214.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Feofitinas / Albúmina Sérica / Cactaceae / Simulación del Acoplamiento Molecular Tipo de estudio: Prognostic_studies Límite: Humans Idioma: En Revista: Molecules Asunto de la revista: BIOLOGIA Año: 2015 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Suiza
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Feofitinas / Albúmina Sérica / Cactaceae / Simulación del Acoplamiento Molecular Tipo de estudio: Prognostic_studies Límite: Humans Idioma: En Revista: Molecules Asunto de la revista: BIOLOGIA Año: 2015 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Suiza