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-Structure paper
| タイトル | Mechanism of synergistic activation of Arp2/3 complex by cortactin and WASP-family proteins. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 14, Issue 1, Page 6894, Year 2023 |
| 掲載日 | 2023年10月28日 |
著者 | Fred E Fregoso / Malgorzata Boczkowska / Grzegorz Rebowski / Peter J Carman / Trevor van Eeuwen / Roberto Dominguez / ![]() |
| PubMed 要旨 | Cortactin coactivates Arp2/3 complex synergistically with WASP-family nucleation-promoting factors (NPFs) and stabilizes branched networks by linking Arp2/3 complex to F-actin. It is poorly ...Cortactin coactivates Arp2/3 complex synergistically with WASP-family nucleation-promoting factors (NPFs) and stabilizes branched networks by linking Arp2/3 complex to F-actin. It is poorly understood how cortactin performs these functions. We describe the 2.89 Å resolution cryo-EM structure of cortactin's N-terminal domain (Cort) bound to Arp2/3 complex. Cortactin binds Arp2/3 complex through an inverted Acidic domain (D20-V29), which targets the same site on Arp3 as the Acidic domain of NPFs but with opposite polarity. Sequences N- and C-terminal to cortactin's Acidic domain do not increase its affinity for Arp2/3 complex but contribute toward coactivation with NPFs. Coactivation further increases with NPF dimerization and for longer cortactin constructs with stronger binding to F-actin. The results suggest that cortactin contributes to Arp2/3 complex coactivation with NPFs in two ways, by helping recruit the complex to F-actin and by stabilizing the short-pitch (active) conformation, which are both byproducts of cortactin's core function in branch stabilization. |
リンク | Nat Commun / PubMed:37898612 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.89 Å |
| 構造データ | EMDB-41135, PDB-8tah: |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-ATP: |
| 由来 |
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キーワード | CONTRACTILE PROTEIN / Complex / migration / actin / cytoskeleton |
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