National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
1F32GM135994-01
米国
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
R01AI127401
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM129241
米国
引用
ジャーナル: Nat Commun / 年: 2022 タイトル: Rubisco forms a lattice inside alpha-carboxysomes. 著者: Lauren Ann Metskas / Davi Ortega / Luke M Oltrogge / Cecilia Blikstad / Derik R Lovejoy / Thomas G Laughlin / David F Savage / Grant J Jensen / 要旨: Despite the importance of microcompartments in prokaryotic biology and bioengineering, structural heterogeneity has prevented a complete understanding of their architecture, ultrastructure, and ...Despite the importance of microcompartments in prokaryotic biology and bioengineering, structural heterogeneity has prevented a complete understanding of their architecture, ultrastructure, and spatial organization. Here, we employ cryo-electron tomography to image α-carboxysomes, a pseudo-icosahedral microcompartment responsible for carbon fixation. We have solved a high-resolution subtomogram average of the Rubisco cargo inside the carboxysome, and determined the arrangement of the enzyme. We find that the H. neapolitanus Rubisco polymerizes in vivo, mediated by the small Rubisco subunit. These fibrils can further pack to form a lattice with six-fold pseudo-symmetry. This arrangement preserves freedom of motion and accessibility around the Rubisco active site and the binding sites for two other carboxysome proteins, CsoSCA (a carbonic anhydrase) and the disordered CsoS2, even at Rubisco concentrations exceeding 800 μM. This characterization of Rubisco cargo inside the α-carboxysome provides insight into the balance between order and disorder in microcompartment organization.
EMPIAR-11125 (タイトル: Cryo electron tomography of H. neapolitanus alpha-carboxysomes Data size: 483.4 Data #1: Reconstructed sample tomograms of purified alpha-carboxysomes, plus frames [reconstructed volumes] Data #2: Reconstructed sample tomograms of wild-type H. neapolitanus cells, plus frames [reconstructed volumes] Data #3: Complete set of subtomograms for Rubisco subtomogram average [picked particles - multiframe - unprocessed])
名称: Rubisco within the alpha-carboxysome / タイプ: organelle_or_cellular_component / ID: 1 / 親要素: 0 詳細: Subtomogram average of Rubisco within carboxysomes purified from H. neapolitanus