ジャーナル: Elife / 年: 2016 タイトル: Crenactin forms actin-like double helical filaments regulated by arcadin-2. 著者: Thierry Izoré / Danguole Kureisaite-Ciziene / Stephen H McLaughlin / Jan Löwe / 要旨: The similarity of eukaryotic actin to crenactin, a filament-forming protein from the crenarchaeon supports the theory of a common origin of Crenarchaea and Eukaryotes. Monomeric structures of ...The similarity of eukaryotic actin to crenactin, a filament-forming protein from the crenarchaeon supports the theory of a common origin of Crenarchaea and Eukaryotes. Monomeric structures of crenactin and actin are similar, although their filament architectures were suggested to be different. Here we report that crenactin forms double helical filaments that show exceptional similarity to eukaryotic F-actin. With cryo-electron microscopy and helical reconstruction we solved the structure of the crenactin filament to 3.8 Å resolution. When forming double filaments, the 'hydrophobic plug' loop in crenactin rearranges. Arcadin-2, also encoded by the arcade gene cluster, binds tightly with its C-terminus to the hydrophobic groove of crenactin. Binding is reminiscent of eukaryotic actin modulators such as cofilin and thymosin β4 and arcadin-2 is a depolymeriser of crenactin filaments. Our work further supports the theory of shared ancestry of Eukaryotes and Crenarchaea.
#241 - 2020年1月 20年の分子を振り返って (Twenty Years of Molecules) 類似性 (3)
-
集合体
登録構造単位
B: Actin/actin family protein A: Actin/actin family protein C: Actin/actin family protein D: Actin/actin family protein E: Actin/actin family protein F: Actin/actin family protein ヘテロ分子
解像度: 3.8→214.4 Å / Cor.coef. Fo:Fc: 0.825 / SU B: 31.405 / SU ML: 0.422 / ESU R: 0.868 立体化学のターゲット値: MAXIMUM LIKELIHOOD WITH PHASES 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS