26s proteasome structure revealed by three-dimensional electron microscopy

Walz, J.; Erdmann, A.; Kania, M.; Typke, D.; Koster, A. J.; Baumeister, W.

アイテム詳細

登録内容を編集ファイル形式で保存

一時保存へ追加

タグ情報を表示リリース履歴を表示詳細要約

公開

学術論文

26s proteasome structure revealed by three-dimensional electron microscopy

MPS-Authors

There are no MPG-Authors in the publication available

External Resource

There are no locators available

Fulltext (restricted access)

There are currently no full texts shared for your IP range.

フルテキスト (公開)

公開されているフルテキストはありません

付随資料 (公開)

There is no public supplementary material available

引用

Walz, J., Erdmann, A., Kania, M., Typke, D., Koster, A. J., & Baumeister, W. (1998). 26s proteasome structure revealed by three-dimensional electron microscopy. Journal of Structural Biology, 121(1), 19-29.

引用: https://hdl.handle.net/11858/00-001M-0000-0010-722C-B

要旨

In 26S proteasomes, ''19S cap complexes'' associate with either one or both ends of the barrel-shaped 20S core complex. These regulatory complexes which comprise about 20 different subunits, including 6 ATPases of the AAA family, are thought to recognize ubiquitinated substrate proteins, to dissociate and unfold them before threading them into the 20S core where they are degraded. Here, we examine the structure of 26S proteasomes from Drosophila embryos and Xenopus oocytes by electron microscopy. Image analysis reveals a rather flexible linkage between the 19S caps and the 20S core, with a peculiar wagging-type movement of the caps relative to the core. At this stage of the analysis, it is not clear whether this movement is relevant in terms of function. Three-dimensional reconstructions, taking this into account, provide first insights into the remarkably complex structure of the 19S caps and allows us to put forward a composite model of the entire 26S complex. (C) 1998 Academic Press. [References: 28]