ジャーナル: Cell / 年: 2011 タイトル: A pseudoatomic model of the dynamin polymer identifies a hydrolysis-dependent powerstroke. 著者: Joshua S Chappie / Jason A Mears / Shunming Fang / Marilyn Leonard / Sandra L Schmid / Ronald A Milligan / Jenny E Hinshaw / Fred Dyda / 要旨: The GTPase dynamin catalyzes membrane fission by forming a collar around the necks of clathrin-coated pits, but the specific structural interactions and conformational changes that drive this process ...The GTPase dynamin catalyzes membrane fission by forming a collar around the necks of clathrin-coated pits, but the specific structural interactions and conformational changes that drive this process remain a mystery. We present the GMPPCP-bound structures of the truncated human dynamin 1 helical polymer at 12.2 Å and a fusion protein, GG, linking human dynamin 1's catalytic G domain to its GTPase effector domain (GED) at 2.2 Å. The structures reveal the position and connectivity of dynamin fragments in the assembled structure, showing that G domain dimers only form between tetramers in sequential rungs of the dynamin helix. Using chemical crosslinking, we demonstrate that dynamin tetramers are made of two dimers, in which the G domain of one molecule interacts in trans with the GED of another. Structural comparison of GG(GMPPCP) to the GG transition-state complex identifies a hydrolysis-dependent powerstroke that may play a role in membrane-remodeling events necessary for fission.
履歴
登録
2011年8月22日
登録サイト: PDBE / 処理サイト: PDBE
改定 1.0
2011年10月12日
Provider: repository / タイプ: Initial release
改定 1.1
2017年6月28日
Group: Data collection / カテゴリ: diffrn_source / Item: _diffrn_source.type
温度: 293 K / 手法: 蒸気拡散法, シッティングドロップ法 / pH: 7 詳細: GGGMPPCP WAS CRYSTALLIZED BY SITTING DROP VAPOR DIFFUSION IN 0.1M HEPES PH 7.0, 200 MM MGCL2, AND 24-30% PEG 2000 MME USING A DROP SIZE OF 3 MICROL AND RESERVOIR VOLUME OF 65 MICROL. CRYSTALS ...詳細: GGGMPPCP WAS CRYSTALLIZED BY SITTING DROP VAPOR DIFFUSION IN 0.1M HEPES PH 7.0, 200 MM MGCL2, AND 24-30% PEG 2000 MME USING A DROP SIZE OF 3 MICROL AND RESERVOIR VOLUME OF 65 MICROL. CRYSTALS GREW IN 3-5 DAYS AT 20C. THE ADDITION OF 200 MM LICL, NACL, KCL, OR NH4CL TO THE RESERVOIR SOLUTION DRAMATICALLY IMPROVED THE CRYSTALS. CRYSTALS GROWN IN THE PRESENCE OF KCL SHOWED THE BEST DIFFRACTION.