首页    期刊浏览 2024年12月12日 星期四
登录注册

文章基本信息

  • 标题:Conformational Changes in Deoxyribonuclease I in Anionic and Cationic Surfactant Solutions
  • 本地全文:下载
  • 作者:Nobuo OKABE ; Shigeki TAKASHIMA ; Keisuke WATANABE
  • 期刊名称:Biological and Pharmaceutical Bulletin
  • 印刷版ISSN:0918-6158
  • 电子版ISSN:1347-5215
  • 出版年度:1993
  • 卷号:16
  • 期号:12
  • 页码:1294-1296
  • DOI:10.1248/bpb.16.1294
  • 出版社:The Pharmaceutical Society of Japan
  • 摘要:The effect of sodium dodecylsulfate (SDS) and deodecyltrimethylammonium chloride (DTAC) on the conformation of bovine pancreatic deoxyribonuclease I (DNase I, EC 3.1.21.1) has been studied by using fluorescence and circular dichroism methods as a function of surfactant concentration. About 60% of the fluorescence was quenched in the presence of 1 mM SDS, indicating the partial conformational transition of DNase I; the conformational susceptibility of DNase I to SDS was reduced by Ca2+ ions. The free energy changes were evaluated at 4.0±0.1 kcal·mol-1 in the presence of 5 mM Ca2+ ions and 2.5±0.1 kcal·mol-1 in the absence of Ca2+ ions. No fluorescence changes occurred in DTAC solution. The residue ellipticity of DNase I at 222 nm decreased in the presence of 1-1.4 mM SDS indicating degradation of the secondary structure of DNase I, while DTAC had not effect on the ellipticity at 222 nm, even in the presence of 10 mM DTAC. The enzymatic activity of DNase I was abolished by SDS, the deactivation profile being compatible with the fluorescence decay profile induced by SDS. On the other hand, no deactivation was induced by DTAC.
  • 关键词:deoxyribonuclease I;SDS;dodecyltrimethylammonium chloride;CD;fluorescence
国家哲学社会科学文献中心版权所有