波谱学杂志 ›› 1992, Vol. 9 ›› Issue (3): 239-245.

• 研究论文 • 上一篇    下一篇

硒(Na2SeO3)稳定红细胞膜骨架蛋白的自旋标记ESR研究

孙继山, 张莉, 杨福愉   

  1. 中国科学院生物物理研究所, 北京 100101
  • 收稿日期:1991-05-15 修回日期:1991-08-20 出版日期:1992-09-05 发布日期:2018-01-20

THE STABILIZING EFFECT OF TRACE AMOUNT OF SELENIUM ON ERYTHROCYTE MEMBRANES

Sun Jishan, Zhang Li, Yang Fuyu   

  1. Institute of Biophysics, The Chinese Academy of Sciences, Beijing 100101
  • Received:1991-05-15 Revised:1991-08-20 Online:1992-09-05 Published:2018-01-20

摘要: 用自旋标记ESR方法研究了无机硒(Na2SO3)对红细胞膜的稳定作用.与对照组相比,加硒组膜的自旋标记ESR波谱弱和强固定化信号比值(W/S)下降,柔性(F)系数上升,这表明硒对膜收缩蛋白有保护作用.使用Triton X-100对膜作温和处理后的ESR波谱表明硒的作用位点是膜蛋白而非磷脂.使用SDS处理的标记膜的ESR波谱证明硒的保护作用并非由交联所致.因而,硒的作用是通过改变膜蛋白构象,促使收缩蛋白二聚体向四聚体或高聚体转变的方式稳定膜结构的.

关键词: 硒, 骨架蛋白, 红细胞膜, 自旋标记, 顺磁共振

Abstract: The stabilizing effect of trace amount of selenium on erythrocyte membranes was studied by means of spin-labeing technique in this paper. The evidences showed that, compared with in selenium-free medium, the ratio of weak immobilizing components of the labeed erythrocyte membrane proteins to that of strong ones (W/S) decreased and flexibility coefficient (F) increased by addition of selenium and incubation at 4℃ for a period of time, which suggested that the tetramers and oligomers of spectrins increased. The mild denaturing experiment by using Triton X-100 at 0℃ for one hour indicated that the selenium have inffunce on the proteins of erythrocyte membranes. The stabilization are neither due to electric interaction nor due to covanlently cross-linking. The configuration variation and subsequent transformation of dimers of spectrins to tetramers and oligomers is probably the main process leading to protection of the membrane skeletons from decomposition. More

Key words: Selenium, Skeleton, Erythrocytc membranes, Spin-labeing, ESR