Electron‐Microscopic Demonstration of a “Head and Stalk” Structure of the Leaf Vacuolar ATPase in Mesembryanthemum crystallinum L.

Electron‐Microscopic Demonstration of a “Head and Stalk” Structure of the Leaf Vacuolar ATPase in Mesembryanthemum crystallinum L.
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电子显微镜展示 Mesembryanthemum crystallinum L 叶液泡 ATP 酶的“头和茎”结构。

DOI:
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发表时间:
1991
期刊:
影响因子:
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通讯作者:
U. Lüttge
U. Lüttge
中科院分区:
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文献类型:
--
作者:
R. Klink;U. Lüttge

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使用膜结合和去污剂溶解的 ATP 酶分子的负染样本,通过电子显微镜研究了来自 Mesembryanthemum crystallinum 叶肉液泡膜的液泡 ATP 酶的结构。我们观察到液泡膜囊泡表面有高密度的颗粒,膜边缘有“头和茎”结构,类似于线粒体和叶绿体膜的 F0F1-ATP 酶。通过使用钨酸甲胺作为膜结合 ATP 酶的阴性染色剂,染色条件通常对此类小物体至关重要。与通常应用的其他染色溶液相比,甲胺钨酸盐可以最好地防止 F1 样酶复合物从膜上解离,并且观察到的囊泡结构损伤最少。 在液泡膜囊泡的冷冻断裂电子显微镜中,由于不使用洗涤剂,因此永远不会发生解离,除了断裂面上的许多颗粒之外,我们还在膜边缘观察到“头和茎”结构。 去污剂溶解的 ATP 酶形成线状结构,这是由酶的疏水膜嵌入的 F0 样部分聚集引起的。负染色后,F1 样酶复合物沿线的两侧交替排列,并通过细茎连接。
The structure of the vacuolar ATPase from mesophyll tonoplasts of Mesembryanthemum crystallinum has been studied by electron microscopy using negatively stained specimens of membrane-bound and detergent-solubilized ATPase molecules. We observed a high density of particles on the surface of tonoplast vesicles and “head and stalk” structures on the edge of the membrane, similar to the F0F1-ATPases of mitochondrial and chloroplast membranes. The staining conditions, which are often critical for such small objects, were improved by using methylamine tungstate as negative stain for the membrane-bound ATPase. Compared to other staining solutions generally applied, dissociation of the F1-like enzyme complex from the membrane was best prevented and structural damage of the vesicles was least observed with methylamine tungstate. In freeze-fracture electron microscopy of tonoplast vesicles, where dissociation never occurs since no detergent is used, we also observed “head and stalk” structures on the edge of the membranes, beside many particles on the fracture faces. The detergent-solubilized ATPase forms string-like structures, caused by the aggregation of the hydrophobic membrane-embedded F0-like part of the enzyme. After negative staining the F1-like enzyme complex is arranged alternately along both sides of the string and connected by a narrow stalk.
网格蛋白包被的囊泡质子易位复合物的二环己基碳二亚胺敏感质子孔的分离和重建。
DOI: --
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影响因子: --
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发表时间: 1989
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影响因子: --
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