title: Study on the interaction between florasulam and bovine serum albumin.
abstract: In this paper, the interaction between florasulam (FU, 2',6',8-trifluoro-5-methoxy [Kragh-Hansen U, Molecular aspects of ligand binding to serum albumin. Pharmacol Rev 33(1):17-53 1981; Carter DC and Ho JX, Structure of serum albumin. Adv Protein Chem 45:153-203 1994; He XM, and Carter DC, Atomic structure and chemistry of human serum albumin. Nature 358(6383):209-215 1992] triazolo [1,5-c]pyrimidine-2-sulfonanilide) and bovine serum albumin (BSA) was investigated by fluorescence, ultraviolet absorption (UV) and Far-UV circular dichroism (CD) spectrometries. A strong fluorescence quenching was observed and the quenching mechanism was considered as static quenching. The binding constant of FU with BSA at 299 and 309 K were obtained as 1.5 x 10(4) and 7.1 x 10(3) l mol(-1), respectively. There was one binding site between FU and BSA. The thermodynamic parameters enthalpy change (DeltaH) and entropy change (DeltaS) were calculated as -57.89 kJ mol(-1) and -113.6 J mol(-1) K(-1), respectively, which indicated that the acting force between FU and BSA was mainly hydrogen bond and Van der Waals force. According to the Förster non-radiation energy transfer theory, the average binding distance between donor (BSA) and acceptor (FU) was obtained (r = 1.59 nm). The investigations of the UV/Vis and CD spectra of the system showed that the conformation of BSA was changed in presence of FU.
authors: Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong, People's Republic of China.
authors: Dehuan
authors: D
authors: Ran
authors: Xia
authors: X
authors: Wu
authors: Jinhua
authors: J
authors: Zheng
authors: Jinghe
authors: J
authors: Yang
authors: Haiping
authors: H
authors: Zhou
authors: Meifeng
authors: M
authors: Zhang
authors: Yongjun
authors: Y
authors: Tang
mesh_terms: D000818:Animals; D001665:Binding Sites; D002417:Cattle; D002942:Circular Dichroism; D004735:Energy Transfer; D066298:In Vitro Techniques; D011487:Protein Conformation; D011743:Pyrimidines / Q000737:chemistry* / Q000378:metabolism; D012710:Serum Albumin, Bovine / Q000737:chemistry* / Q000378:metabolism; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013449:Sulfonamides / Q000737:chemistry* / Q000378:metabolism; D013816:Thermodynamics; D014364:Tryptophan / Q000737:chemistry
chemical_list: D011743:Pyrimidines; D013449:Sulfonamides; C413390:florasulam; D012710:Serum Albumin, Bovine; D014364:Tryptophan
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