高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (7): 1057.

• 论文 • 上一篇    下一篇

稀土离子与伴清蛋白结合的光谱研究

杨斌盛1, Wesley R. Harris2   

  1. 1. 山西大学分子科学研究所, 太原, 030006;
    2. DepartmentofChemistry, UniversityofMissouri-StLouis, StLouis, MO63121
  • 收稿日期:1997-12-25 出版日期:1998-07-24 发布日期:1998-07-24
  • 通讯作者: 杨斌盛,男,40岁,硕士,教授.
  • 作者简介:杨斌盛,男,40岁,硕士,教授.

Spectroscopic Studies on the Binding of Lanthanides to Apoovotransferrin

YANG Bin-Sheng1, Wesley R. Harris2   

  1. 1. Institute of Molecular Science, Shanxi University, Taiyuan, 030006;
    2. Department of Chemistry, University of Missouri St Louis, St Louis, MO63121, USA
  • Received:1997-12-25 Online:1998-07-24 Published:1998-07-24

摘要: 在pH=7.4和25℃下,用紫外吸收差光谱进行Eu3+对脱铁伴清蛋白的滴定。Eu3+与脱铁伴清蛋白结合后其差光谱在245nm和296nm处出现吸收峰,在245nm处Eu3+-脱铁伴清蛋白配合物的摩尔吸光系数是(2.1±0.1)×104cm-1·L·mol-1,Eu3+可占据脱铁伴清蛋白的2个金属离子结合部位,条件平衡常数lgKN=8.21±0.20,lgKC=4.60±0.11.脱铁伴清蛋白、N-端单铁伴清蛋白的紫外差光谱及荧光光谱滴定均表明,稀土离子优先占据脱铁伴清蛋白的N-端结合部位。

关键词: 伴清蛋白, 稀土离子, 光谱

Abstract: The binding of Eu3+to chicken egg apoovotransferrin has been studied by monitoring the change of differential UVspectra at 245 nm. Conditional equilibrium constants for the complexation of Eu3+with chicken egg apoovotransferrin in 0.1 mol/Lhepes, pH7.4, at 25 ℃ have been measured. The results are lgK1=8.21±0.20 and lgK2=4.60±0.11 for complexation of Eu3+. The molar absorptivity per binding site for Eu3+is (2.1±0.1)×104cm-1·L·mol-1. The titration of N-terminal monoferric ovotransferrin with Eu3+(differential UVspectra) and Tb3+(fluorescence) indicate that the binding of lanthanide ions at N-terminal binding site is stronger than that at C-terminal binding site.

Key words: Ovotransferrin, Lanthanide ions, Spectra

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