Rabilloud T, Adessi C, Giraudel A, Lunardi J
CEA-Laboratoire de Bioénergétique Cellulaire et Pathologique, UA 2019 DBMS/BECP, Grenoble, France.
Electrophoresis. 1997 Mar-Apr;18(3-4):307-16. doi: 10.1002/elps.1150180303.
Membrane and nuclear proteins of poor solubility have been separated by high resolution two-dimensional (2-D) gel electrophoresis. Isoelectric focusing with immobilized pH gradients leads to severe quantitative losses of proteins in the resulting 2-D map, although the resolution is usually high. Protein solubility could be improved by using denaturing solutions containing various detergents and chaotropes. Best results were obtained with a denaturing solution containing urea, thiourea, and detergents (both nonionic and zwitterionic). The usefulness of thiourea-containing denaturing mixtures is shown for microsomal and nuclear proteins as well as for tubulin, a protein highly prone to aggregation.
溶解度低的膜蛋白和核蛋白已通过高分辨率二维(2-D)凝胶电泳分离。使用固定化pH梯度进行等电聚焦会导致所得二维图谱中的蛋白质出现严重的定量损失,尽管分辨率通常较高。通过使用含有各种去污剂和离液剂的变性溶液可以提高蛋白质的溶解度。含有尿素、硫脲和去污剂(非离子型和两性离子型)的变性溶液取得了最佳效果。含硫脲的变性混合物对微粒体蛋白、核蛋白以及微管蛋白(一种极易聚集的蛋白质)均显示出有效性。