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-Structure paper
| タイトル | Structure and encapsulation of carbonic anhydrase within the α-carboxysome. |
|---|---|
| ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 122, Issue 46, Page e2523723122, Year 2025 |
| 掲載日 | 2025年11月18日 |
著者 | Pei Cing Ng / Oluwatobi Adegbite / Tianpei Li / Arnaud Baslé / Jon Marles-Wright / Lu-Ning Liu / ![]() |
| PubMed 要旨 | Carboxysomes in cyanobacteria and certain proteobacteria enable efficient CO fixation by encapsulating ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and carbonic anhydrase (CA) within a ...Carboxysomes in cyanobacteria and certain proteobacteria enable efficient CO fixation by encapsulating ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and carbonic anhydrase (CA) within a semipermeable shell. Sequestered CA catalyze the rapid interconversion of CO and HCO, supplying elevated levels of CO to boost Rubisco carboxylation. Despite its essential role, the structure and encapsulation of CA within carboxysomes remain poorly understood. Here, we determined the molecular structure of α-carboxysomal CA from the model chemoautotrophic bacterium (CsoSCA). CsoSCA adopts a trimer-of-dimers oligomeric structure without the incorporation of a zinc ion at its symmetric center. Using synthetic minishells, we demonstrate that CsoSCA interacts with the CsoS1A shell hexamer and is incorporated into the minishells at the inner surface, independent of the CsoS2 linker protein. CsoSCA truncations suggest nonspecific interactions between CsoSCA and CsoS1A. We further show that CsoSCA bridges Rubisco and the shell facets. Our study offers insights into the assembly and encapsulation mechanisms of α-carboxysomes and provides the framework for reprogramming carboxysome structures for synthetic biology and biotechnological applications. |
リンク | Proc Natl Acad Sci U S A / PubMed:41223214 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 1.82 - 3.1 Å |
| 構造データ | EMDB-51067, PDB-9g4t: EMDB-51633, PDB-9gvc: EMDB-51641, PDB-9gw1: |
| 化合物 | ![]() ChemComp-ZN: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | LYASE / Carbonic anhydrase / Carboxysome / rubisco / STRUCTURAL PROTEIN |
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halothiobacillus neapolitanus (紅色硫黄細菌)
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