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-Structure paper
タイトル | Structure of γ-tubulin small complex based on a cryo-EM map, chemical cross-links, and a remotely related structure. |
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ジャーナル・号・ページ | J Struct Biol, Vol. 194, Issue 3, Page 303-310, Year 2016 |
掲載日 | 2016年3月8日 |
著者 | Charles H Greenberg / Justin Kollman / Alex Zelter / Richard Johnson / Michael J MacCoss / Trisha N Davis / David A Agard / Andrej Sali / |
PubMed 要旨 | Modeling protein complex structures based on distantly related homologues can be challenging due to poor sequence and structure conservation. Therefore, utilizing even low-resolution experimental ...Modeling protein complex structures based on distantly related homologues can be challenging due to poor sequence and structure conservation. Therefore, utilizing even low-resolution experimental data can significantly increase model precision and accuracy. Here, we present models of the two key functional states of the yeast γ-tubulin small complex (γTuSC): one for the low-activity "open" state and another for the higher-activity "closed" state. Both models were computed based on remotely related template structures and cryo-EM density maps at 6.9Å and 8.0Å resolution, respectively. For each state, extensive sampling of alignments and conformations was guided by the fit to the corresponding cryo-EM density map. The resulting good-scoring models formed a tightly clustered ensemble of conformations in most regions. We found significant structural differences between the two states, primarily in the γ-tubulin subunit regions where the microtubule binds. We also report a set of chemical cross-links that were found to be consistent with equilibrium between the open and closed states. The protocols developed here have been incorporated into our open-source Integrative Modeling Platform (IMP) software package (http://integrativemodeling.org), and can therefore be applied to many other systems. |
リンク | J Struct Biol / PubMed:26968363 / PubMed Central |
手法 | EM (らせん対称) |
解像度 | 6.9 - 8 Å |
構造データ | PDB-5flz: PDB-5fm1: |
由来 |
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キーワード | CELL CYCLE / MICROTUBULE NUCLEATION / MICROTUBULE / NUCLEATION / TUBULIN / FILAMENT |