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| タイトル | Single-particle cryo-EM analysis of the shell architecture and internal organization of an intact α-carboxysome. |
|---|---|
| ジャーナル・号・ページ | Structure, Vol. 31, Issue 6, Page 677-688.e4, Year 2023 |
| 掲載日 | 2023年6月1日 |
著者 | Sasha L Evans / Monsour M J Al-Hazeem / Daniel Mann / Nicolas Smetacek / Andrew J Beavil / Yaqi Sun / Taiyu Chen / Gregory F Dykes / Lu-Ning Liu / Julien R C Bergeron / ![]() |
| PubMed 要旨 | Carboxysomes are proteinaceous bacterial microcompartments that sequester the key enzymes for carbon fixation in cyanobacteria and some proteobacteria. They consist of a virus-like icosahedral shell, ...Carboxysomes are proteinaceous bacterial microcompartments that sequester the key enzymes for carbon fixation in cyanobacteria and some proteobacteria. They consist of a virus-like icosahedral shell, encapsulating several enzymes, including ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCO), responsible for the first step of the Calvin-Benson-Bassham cycle. Despite their significance in carbon fixation and great bioengineering potentials, the structural understanding of native carboxysomes is currently limited to low-resolution studies. Here, we report the characterization of a native α-carboxysome from a marine cyanobacterium by single-particle cryoelectron microscopy (cryo-EM). We have determined the structure of its RuBisCO enzyme, and obtained low-resolution maps of its icosahedral shell, and of its concentric interior organization. Using integrative modeling approaches, we have proposed a complete atomic model of an intact carboxysome, providing insight into its organization and assembly. This is critical for a better understanding of the carbon fixation mechanism and toward repurposing carboxysomes in synthetic biology for biotechnological applications. |
リンク | Structure / PubMed:37015227 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.87 - 20.0 Å |
| 構造データ | ![]() EMDB-14376: Cryo-EM structure of the Cyanobium sp. PCC 7001 RuBisCO enzyme at 3.8 A resolution with C1 symmetry ![]() EMDB-14377: Cryo-EM structure of Cyanobium sp. PCC 7001 carboxysome shell ![]() EMDB-14379: Cryo-EM structure of an intact carboxysome - core layer ![]() EMDB-14380: Cryo-EM structure of the Cyanobium sp. PCC 7001 Carboxysome internal density outer layer ![]() EMDB-14381: Cryo-EM structure of the Cyanobium sp. PCC 7001 Carboxysome internal density middle layer EMDB-14385, PDB-7yyo: ![]() PDB-8cmy: |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-CAP: |
| 由来 |
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キーワード | PHOTOSYNTHESIS / Carboxysome / carbon fixation / cyanobacteria |
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Cyanobium sp. PCC 7001 (バクテリア)
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