An Overview of Drug Binding to Human Serum Albumin: Protein Folding and Unfolding

被引:0
|
作者
Tajmir-Riahi, H. A. [1 ]
机构
[1] Univ Quebec Trois Rivieres, Dept Biol Chem, Trois Rivieres, PQ GA9 5H7, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
SECONDARY STRUCTURE; FT-IR; CAPILLARY-ELECTROPHORESIS; INFRARED-SPECTROSCOPY; THERMAL-DENATURATION; PACLITAXEL; COMPLEXES; CISPLATIN; GEL;
D O I
暂无
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Human Serum Albumin (HSA) is a principal extracellular protein with a high concentration in blood plasma and a carrier of many drugs to different molecular targets. Drug binding to HSA can alter the protein biophysical and biochemical properties of protein. The structural analysis of human serum albumin complexes, with naturally occurring flavonoids quercetin (antioxidant), kaempferol (antioxidant), delphinidin (antioxidant), AZT (3'-azido-3'-deoxythymidine) (anti-AIDS), aspirin (anti-inflammatory), taxol (anticancer), cisplatin (anticancer), atrazine (herbicide), 2,4-D (herbicide), polyamines (biogenic), chlorophyll (antimutagenic), chlorophyllin (antitumor), poly(ethylene glycol) (polymer), vandyl cation and vanadate anion in aqueous solution are reported. Using capillary electrophoresis, FTIR (Fourier transform infrared), UV-Visible and CD (Circular dichroism) spectroscopic methods, the drug binding mode, the binding constant and the effects of drug complexation on protein secondary structure are determined. The concentrations of HSA used were 0.6 to 0.3 mM, while different drug concentrations were 1 mu M to 1 mM. Structural analysis showed drugs are mostly located along the polypeptide chains, with both specific and non-specific interactions. The stability of drug-HSA complexes were in the order: K-VO(2+) = 1.2 x 10(8)M(-1) > K-AZT = 1.9 x 10(6)M(-1) > K-del = 4.7 x 10(5)M(-1) > K-PEG = 4.1 x 10(5)M(-1) > K-kae = 2.6 x 10(5)M(-1) > K-que = 1.4 x 10(5)M(-1) > K-atrazine = 3.5 x 10(4)M(-1) > K-chlorophyll = 2.9 x 10(4)M(-1) > K-2,K-4-D = 2.5 x 10(4)M(-1) K-spermine = 1.7 x 10(4)M(-1) > K-taxol = 1.43 x 10(4)M(-1) > K-aspirin = 5.4 x 10(3)M(-1) > K-putrescine = 3.9 x 10(3)M(-1) > K-cisplatin = 1.2 x 10(2)M(-1). At low drug concentration (1 mu M), protein conformation was not altered (infrared and CD results), while, at high drug content (1 mM), a major reduction of alpha-helix from 60-55% (free HSA) to 49-40% and an increase of beta-structure from 22-15% (free HSA) to 33-23% in the drug-protein complexes occurred. These observations indicated that low drug content induced protein stabilization (folding), whereas, at high drug concentration, a partial protein destabilization (unfolding) occurred in these drug-HSA complexes.
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收藏
页码:87 / 95
页数:9
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