Sitaramam V, Sarma M K
Proc Natl Acad Sci U S A. 1981 Jun;78(6):3441-5. doi: 10.1073/pnas.78.6.3441.
Isotonic conditions for the integrity of subcellular organelles are shown to be remarkably influenced by the concentration of sucrose present during their isolation by centrifugation. Using the technique of enzyme osmometry, we show that the content of sucrose in synaptosomes reflects nearly total equilibration across the membrane during centrifugation, due to altered permeability of membranes. Presence of sucrose in the matrix space of mitochondria, as demonstrated by enzyme osmometry of matrix enzymes, indicates that the sucrose-space hypothesis is invalid.
等渗条件对亚细胞器完整性的影响显著受离心分离过程中蔗糖浓度的影响。使用酶渗透压测定技术,我们发现突触体中蔗糖的含量反映了离心过程中膜两侧几乎完全的平衡,这是由于膜通透性的改变。通过对线粒体基质酶的酶渗透压测定表明,线粒体基质空间中存在蔗糖,这表明蔗糖空间假说是无效的。