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-Structure paper
タイトル | A pseudoatomic model of the dynamin polymer identifies a hydrolysis-dependent powerstroke. |
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ジャーナル・号・ページ | Cell, Vol. 147, Issue 1, Page 209-222, Year 2011 |
掲載日 | 2011年9月30日 |
著者 | Joshua S Chappie / Jason A Mears / Shunming Fang / Marilyn Leonard / Sandra L Schmid / Ronald A Milligan / Jenny E Hinshaw / Fred Dyda / |
PubMed 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. |
リンク | Cell / PubMed:21962517 / PubMed Central |
手法 | EM (らせん対称) / X線回折 |
解像度 | 2.2 - 12.2 Å |
構造データ | EMDB-1949, PDB-3zys: PDB-3zyc: |
化合物 | ChemComp-GCP: ChemComp-MG: ChemComp-HOH: |
由来 |
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キーワード | HYDROLASE / MEMBRANE FISSION / NUCLEOTIDE-BINDING / ENDOCYTOSIS / MOTOR PROTEIN / HYDROLASE/GTP-BINDING PROTEIN / HYDROLASE-GTP-BINDING PROTEIN COMPLEX / GTP HYDROLYSIS / MEMBRANE REMODELING |