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.
名称: Native human gamma-tubulin ring complex / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all
由来(天然)
生物種: Homo sapiens (ヒト)
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分子 #1: Gamma-tubulin complex component 6
分子
名称: Gamma-tubulin complex component 6 / タイプ: protein_or_peptide / ID: 1 詳細: Please note that the full sequence for GCP6 (Uniprot accession number Q96RT7) was much longer than our modeled region, and the alignment failed to capture the domains we built, despite all ...詳細: Please note that the full sequence for GCP6 (Uniprot accession number Q96RT7) was much longer than our modeled region, and the alignment failed to capture the domains we built, despite all residues being numbered accordingly in the submitted coordinates. See below for full sequence. コピー数: 1 / 光学異性体: LEVO