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-Structure paper
| タイトル | Exploring the conformational space of the mobile flap in Sporosarcina pasteurii urease by cryo-electron microscopy. |
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| ジャーナル・号・ページ | Int J Biol Macromol, Vol. 283, Issue Pt 3, Page 137904, Year 2024 |
| 掲載日 | 2024年11月20日 |
著者 | Luca Mazzei / Giancarlo Tria / Stefano Ciurli / Michele Cianci / ![]() |
| PubMed 要旨 | To fully understand enzymatic dynamics, it is essential to explore the complete conformational space of a biological catalyst. The catalytic mechanism of the nickel-dependent urease, the most ...To fully understand enzymatic dynamics, it is essential to explore the complete conformational space of a biological catalyst. The catalytic mechanism of the nickel-dependent urease, the most efficient enzyme known, holds significant relevance for medical, pharmaceutical, and agro-environmental applications. A critical aspect of urease function is the conformational change of a helix-turn-helix motif that covers the active site cavity, known as the mobile flap. This motif has been observed in either an open or a closed conformation through X-ray crystallography studies and has been proposed to stabilize the coordination of a urea molecule to the essential dinuclear Ni(II) cluster in the active site, a requisite for subsequent substrate hydrolysis. This study employs cryo-electron microscopy (cryo-EM) to investigate the transient states within the conformational space of the mobile flap, devoid of the possible constraints of crystallization conditions and solid-state effects. By comparing two cryo-EM structures of Sporosarcina pasteurii urease, one in its native form and the other inhibited by N-(n-butyl) phosphoric triamide (NBPTO), we have unprecedently identified an intermediate state between the open and the catalytically efficient closed conformation of the helix-turn-helix motif, suggesting a role of its tip region in this transition between the two states. |
リンク | Int J Biol Macromol / PubMed:39571870 |
| 手法 | EM (単粒子) |
| 解像度 | 2.92 - 3.12 Å |
| 構造データ | EMDB-51450, PDB-9gml: EMDB-51478, PDB-9gnr: |
| 化合物 | ![]() ChemComp-NI: ![]() ChemComp-OH: ![]() ChemComp-HOH: ![]() ChemComp-2PA: |
| 由来 |
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キーワード | HYDROLASE / Urease / enzyme / Nickel / urea / NBPTO |
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sporosarcina pasteurii (バクテリア)
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