National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35 GM130234
米国
Human Frontier Science Program (HFSP)
LT000025/18-L1
フランス
引用
ジャーナル: Cell / 年: 2020 タイトル: Asymmetric Molecular Architecture of the Human γ-Tubulin Ring Complex. 著者: Michal Wieczorek / Linas Urnavicius / Shih-Chieh Ti / Kelly R Molloy / Brian T Chait / Tarun M Kapoor / 要旨: The γ-tubulin ring complex (γ-TuRC) is an essential regulator of centrosomal and acentrosomal microtubule formation, yet its structure is not known. Here, we present a cryo-EM reconstruction of the ...The γ-tubulin ring complex (γ-TuRC) is an essential regulator of centrosomal and acentrosomal microtubule formation, yet its structure is not known. Here, we present a cryo-EM reconstruction of the native human γ-TuRC at ∼3.8 Å resolution, revealing an asymmetric, cone-shaped structure. Pseudo-atomic models indicate that GCP4, GCP5, and GCP6 form distinct Y-shaped assemblies that structurally mimic GCP2/GCP3 subcomplexes distal to the γ-TuRC "seam." We also identify an unanticipated structural bridge that includes an actin-like protein and spans the γ-TuRC lumen. Despite its asymmetric architecture, the γ-TuRC arranges γ-tubulins into a helical geometry poised to nucleate microtubules. Diversity in the γ-TuRC subunits introduces large (>100,000 Å) surfaces in the complex that allow for interactions with different regulatory factors. The observed compositional complexity of the γ-TuRC could self-regulate its assembly into a cone-shaped structure to control microtubule formation across diverse contexts, e.g., within biological condensates or alongside existing filaments.
履歴
登録
2019年12月4日
登録サイト: RCSB / 処理サイト: RCSB
改定 1.0
2020年1月1日
Provider: repository / タイプ: Initial release
改定 1.0
2020年1月1日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
改定 1.0
2020年1月1日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2020年1月1日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
改定 1.0
2020年1月1日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
改定 1.0
2020年1月1日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2020年1月1日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
改定 1.0
2020年1月1日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
改定 1.0
2020年1月1日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2020年1月1日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / カテゴリ: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name