Council of Scientific & Industrial Research (CSIR)
FBR070301
インド
Council of Scientific & Industrial Research (CSIR)
OLP0028
インド
引用
ジャーナル: Nat Struct Mol Biol / 年: 2025 タイトル: Activation of Arp2/3 complex by a SPIN90 dimer in linear actin-filament nucleation. 著者: Justus Francis / Achyutha Krishna Pathri / Kankipati Teja Shyam / Sridhar Sripada / Rishav Mitra / Heidy Y Narvaez-Ortiz / Kiran Vyshnav Eliyan / Brad J Nolen / Saikat Chowdhury / 要旨: Arp2/3 complex is a key nucleator of actin filaments. It requires activation by nucleation-promoting factors (NPFs). WISH/DIP1/SPIN90 (WDS) proteins represent a unique class of NPFs that activate the ...Arp2/3 complex is a key nucleator of actin filaments. It requires activation by nucleation-promoting factors (NPFs). WISH/DIP1/SPIN90 (WDS) proteins represent a unique class of NPFs that activate the Arp2/3 complex independently of preexisting filaments, promoting linear actin-filament nucleation. In fission yeast, Dip1 binds to the clamp subunits in Arp2/3 complex to induce the short-pitch conformation, where Arp2 moves closer to Arp3 to mimic a filamentous actin dimer. However, how WDS proteins stimulate subunit flattening in Arp subunits, a 'scissor-like' conformational change akin to what is observed in an actin monomer during filament formation, remained unclear. Here we present cryo-electron microscopy structures of human SPIN90 bound to activated bovine Arp2/3 complex on an actin filament pointed end. The structures show that SPIN90 dimerizes through a metazoan-specific domain in the middle segment, engaging both the clamp and the Arp3/ARPC3 interface, to drive the activating conformational changes in Arp2/3 complex. Remarkably, a single SPIN90 dimer can also bridge two Arp2/3 complexes, enabling bidirectional actin nucleation and suggesting a mechanism for rapidly assembling complex actin network architectures.
名称: Actin-related protein 3 / タイプ: protein_or_peptide / ID: 1 詳細: Any gaps are due to unmodelled regions because of poor map quality or no density for those regions. コピー数: 2 / 光学異性体: LEVO
名称: Actin-related protein 2 / タイプ: protein_or_peptide / ID: 2 詳細: Any gaps are due to unmodelled regions because of poor map quality or no density for those regions. コピー数: 2 / 光学異性体: LEVO
分子 #3: Actin-related protein 2/3 complex subunit 1B
分子
名称: Actin-related protein 2/3 complex subunit 1B / タイプ: protein_or_peptide / ID: 3 詳細: Any gaps are due to unmodelled regions because of poor map quality or no density for those regions. コピー数: 2 / 光学異性体: LEVO
UniProtKB: Actin-related protein 2/3 complex subunit 1B
+
分子 #4: Actin-related protein 2/3 complex subunit 2
分子
名称: Actin-related protein 2/3 complex subunit 2 / タイプ: protein_or_peptide / ID: 4 詳細: Any gaps are due to unmodelled regions because of poor map quality or no density for those regions. コピー数: 2 / 光学異性体: LEVO
UniProtKB: Actin-related protein 2/3 complex subunit 3
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分子 #6: Actin-related protein 2/3 complex subunit 4
分子
名称: Actin-related protein 2/3 complex subunit 4 / タイプ: protein_or_peptide / ID: 6 詳細: Any gaps are due to unmodelled regions because of poor map quality or no density for those regions. コピー数: 2 / 光学異性体: LEVO
UniProtKB: Actin-related protein 2/3 complex subunit 4
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分子 #7: Actin-related protein 2/3 complex subunit 5
分子
名称: Actin-related protein 2/3 complex subunit 5 / タイプ: protein_or_peptide / ID: 7 詳細: Any gaps are due to unmodelled regions because of poor map quality or no density for those regions. コピー数: 2 / 光学異性体: LEVO
UniProtKB: Actin-related protein 2/3 complex subunit 5
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分子 #8: NCK-interacting protein with SH3 domain
分子
名称: NCK-interacting protein with SH3 domain / タイプ: protein_or_peptide / ID: 8 詳細: This is a truncated construct of human SPIN90 protein that range from residues 269-722. Any gaps are due to unmodelled regions because of poor map quality or no density for those regions. コピー数: 2 / 光学異性体: LEVO
UniProtKB: NCK-interacting protein with SH3 domain
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分子 #9: Actin, alpha skeletal muscle
分子
名称: Actin, alpha skeletal muscle / タイプ: protein_or_peptide / ID: 9 詳細: Residue 73 is HIC (4-methylhistidine). Due to lack of side chain densities for Chains I and i all residues have been truncated to stubs (c-beta). Any gaps are due to unmodelled regions ...詳細: Residue 73 is HIC (4-methylhistidine). Due to lack of side chain densities for Chains I and i all residues have been truncated to stubs (c-beta). Any gaps are due to unmodelled regions because of poor map quality or no density for those regions. コピー数: 8 / 光学異性体: LEVO