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-Structure paper
| タイトル | The hook-like adaptor and cargo-binding (HAC) domain in the kinesin-2 tail enables adaptor assembly and cargo recognition. |
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| ジャーナル・号・ページ | Sci Adv, Vol. 11, Issue 43, Page eady5861, Year 2025 |
| 掲載日 | 2025年10月24日 |
著者 | Xuguang Jiang / Radostin Danev / Sotaro Ichinose / Baichun Niu / Sumio Ohtsuki / Haruaki Yanagisawa / Satoru Nagatoishi / Kouhei Tsumoto / Nobutaka Hirokawa / Masahide Kikkawa / ![]() |
| PubMed 要旨 | Intracellular transport relies on motor proteins such as kinesins to deliver cargo along microtubules, yet how they recognize cargo remains unclear. Here, we present high-resolution cryo-electron ...Intracellular transport relies on motor proteins such as kinesins to deliver cargo along microtubules, yet how they recognize cargo remains unclear. Here, we present high-resolution cryo-electron microscopy structures of the heterotrimeric kinesin-2 complex (KIF3A/KIF3B/KAP3) bound to the cargo protein APC. Our findings reveal a previously uncharacterized KIF3 tail hook-like motif, termed the "HAC" domain, which mediates binding to both KAP3 adaptor and APC cargo. Within this domain, the KIF3A helical regions ensure cargo specificity, while a β-hairpin and KIF3B provide structural support. Biochemical and neuronal experiments confirm its functional importance. Notably, the HAC/KAP3 structure resembles hook-like architectures seen in kinesin-1 and dynein, suggesting a shared cargo recognition framework. These findings also shed light on kinesin-2 cargo specificity and offer a structural framework for understanding related neuronal transport mechanisms. |
リンク | Sci Adv / PubMed:41134888 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.83 - 2.9 Å |
| 構造データ | EMDB-65777, PDB-9w9h: EMDB-65778, PDB-9w9i: |
| 由来 |
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キーワード | MOTOR PROTEIN / Kinesin-2 motor Intracellular transport Kinesin-adaptor complex / Kinesin-2 motor Intracellular transport Kinesin-adaptor-cargo complex |
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