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-Structure paper
タイトル | Structural insights into ATP hydrolysis by the MoxR ATPase RavA and the LdcI-RavA cage-like complex. |
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ジャーナル・号・ページ | Commun Biol, Vol. 3, Issue 1, Page 46, Year 2020 |
掲載日 | 2020年1月28日 |
著者 | Matthew Jessop / Benoit Arragain / Roger Miras / Angélique Fraudeau / Karine Huard / Maria Bacia-Verloop / Patrice Catty / Jan Felix / Hélène Malet / Irina Gutsche / |
PubMed 要旨 | The hexameric MoxR AAA+ ATPase RavA and the decameric lysine decarboxylase LdcI form a 3.3 MDa cage, proposed to assist assembly of specific respiratory complexes in E. coli. Here, we show that ...The hexameric MoxR AAA+ ATPase RavA and the decameric lysine decarboxylase LdcI form a 3.3 MDa cage, proposed to assist assembly of specific respiratory complexes in E. coli. Here, we show that inside the LdcI-RavA cage, RavA hexamers adopt an asymmetric spiral conformation in which the nucleotide-free seam is constrained to two opposite orientations. Cryo-EM reconstructions of free RavA reveal two co-existing structural states: an asymmetric spiral, and a flat C2-symmetric closed ring characterised by two nucleotide-free seams. The closed ring RavA state bears close structural similarity to the pseudo two-fold symmetric crystal structure of the AAA+ unfoldase ClpX, suggesting a common ATPase mechanism. Based on these structures, and in light of the current knowledge regarding AAA+ ATPases, we propose different scenarios for the ATP hydrolysis cycle of free RavA and the LdcI-RavA cage-like complex, and extend the comparison to other AAA+ ATPases of clade 7. |
リンク | Commun Biol / PubMed:31992852 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 6.0 - 7.8 Å |
構造データ | EMDB-10351, PDB-6sza: EMDB-10352, PDB-6szb: |
化合物 | ChemComp-PLP: ChemComp-ADP: |
由来 |
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キーワード | HYDROLASE / Complex / MoxR ATPase / Lysine decarboxylase / CHAPERONE / AAA+ ATPase / MoxR / Escherichia coli |