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-Structure paper
タイトル | CM1-driven assembly and activation of yeast γ-tubulin small complex underlies microtubule nucleation. |
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ジャーナル・号・ページ | Elife, Vol. 10, Year 2021 |
掲載日 | 2021年5月5日 |
著者 | Axel F Brilot / Andrew S Lyon / Alex Zelter / Shruthi Viswanath / Alison Maxwell / Michael J MacCoss / Eric G Muller / Andrej Sali / Trisha N Davis / David A Agard / |
PubMed 要旨 | Microtubule (MT) nucleation is regulated by the γ-tubulin ring complex (γTuRC), conserved from yeast to humans. In , γTuRC is composed of seven identical γ-tubulin small complex (γTuSC) sub- ...Microtubule (MT) nucleation is regulated by the γ-tubulin ring complex (γTuRC), conserved from yeast to humans. In , γTuRC is composed of seven identical γ-tubulin small complex (γTuSC) sub-assemblies, which associate helically to template MT growth. γTuRC assembly provides a key point of regulation for the MT cytoskeleton. Here, we combine crosslinking mass spectrometry, X-ray crystallography, and cryo-EM structures of both monomeric and dimeric γTuSCs, and open and closed helical γTuRC assemblies in complex with Spc110p to elucidate the mechanisms of γTuRC assembly. γTuRC assembly is substantially aided by the evolutionarily conserved CM1 motif in Spc110p spanning a pair of adjacent γTuSCs. By providing the highest resolution and most complete views of any γTuSC assembly, our structures allow phosphorylation sites to be mapped, surprisingly suggesting that they are mostly inhibitory. A comparison of our structures with the CM1 binding site in the human γTuRC structure at the interface between GCP2 and GCP6 allows for the interpretation of significant structural changes arising from CM1 helix binding to metazoan γTuRC. |
リンク | Elife / PubMed:33949948 / PubMed Central |
手法 | EM (らせん対称) / EM (単粒子) / X線回折 |
解像度 | 2.00001856449 - 4.45 Å |
構造データ | EMDB-23635, PDB-7m2w: EMDB-23636, PDB-7m2x: EMDB-23637, PDB-7m2y: EMDB-23638, PDB-7m2z: EMDB-23639: PDB-7m3p: |
化合物 | ChemComp-GTP: ChemComp-GDP: ChemComp-HOH: |
由来 |
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キーワード | CELL CYCLE / microtubule nucleation |