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-Structure paper
タイトル | Cryo-EM reveals mechanistic insights into lipid-facilitated polyamine export by human ATP13A2. |
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ジャーナル・号・ページ | Mol Cell, Vol. 81, Issue 23, Page 4799-44809.e5, Year 2021 |
掲載日 | 2021年12月2日 |
著者 | Atsuhiro Tomita / Takashi Daiho / Tsukasa Kusakizako / Keitaro Yamashita / Satoshi Ogasawara / Takeshi Murata / Tomohiro Nishizawa / Osamu Nureki / |
PubMed 要旨 | The cytoplasmic polyamine maintains cellular homeostasis by chelating toxic metal cations, regulating transcriptional activity, and protecting DNA. ATP13A2 was identified as a lysosomal polyamine ...The cytoplasmic polyamine maintains cellular homeostasis by chelating toxic metal cations, regulating transcriptional activity, and protecting DNA. ATP13A2 was identified as a lysosomal polyamine exporter responsible for polyamine release into the cytosol, and its dysfunction is associated with Alzheimer's disease and other neural degradation diseases. ATP13A2 belongs to the P5 subfamily of the P-type ATPase family, but its mechanisms remain unknown. Here, we report the cryoelectron microscopy (cryo-EM) structures of human ATP13A2 under four different conditions, revealing the structural coupling between the polyamine binding and the dephosphorylation. Polyamine is bound at the luminal tunnel and recognized through numerous electrostatic and π-cation interactions, explaining its broad specificity. The unique N-terminal domain is anchored to the lipid membrane to stabilize the E2P conformation, thereby accelerating the E1P-to-E2P transition. These findings reveal the distinct mechanism of P5B ATPases, thereby paving the way for neuroprotective therapy by activating ATP13A2. |
リンク | Mol Cell / PubMed:34798056 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.54 - 3.92 Å |
構造データ | EMDB-32066, PDB-7vpi: EMDB-32067, PDB-7vpj: EMDB-32068, PDB-7vpk: EMDB-32069, PDB-7vpl: |
化合物 | ChemComp-ACP: ChemComp-MG: ChemComp-ADP: ChemComp-NAG: ChemComp-ALF: ChemComp-BEF: ChemComp-SPM: |
由来 |
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キーワード | MEMBRANE PROTEIN / ATP13A2 / PARK9 / P-type ATPase |