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Yorodumi- PDB-25hn: Cryo-EM structure of native Rubisco from Nitrosospira multiformis -
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Basic information
| Entry | Database: PDB / ID: 25hn | |||||||||||||||||||||||||||
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| Title | Cryo-EM structure of native Rubisco from Nitrosospira multiformis | |||||||||||||||||||||||||||
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Keywords | LYASE / rubisco / carbon fixation / nitrifying bacterium / autotrophy / cryo-EM | |||||||||||||||||||||||||||
| Function / homology | Function and homology informationribulose-bisphosphate carboxylase / ribulose-bisphosphate carboxylase activity / reductive pentose-phosphate cycle / monooxygenase activity / magnesium ion binding Similarity search - Function | |||||||||||||||||||||||||||
| Biological species | Nitrosospira multiformis ATCC 25196 (bacteria) | |||||||||||||||||||||||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.26 Å | |||||||||||||||||||||||||||
Authors | Tanaka, Y. / Nishigaya, Y. | |||||||||||||||||||||||||||
| Funding support | 1items
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Citation | Journal: Biochem Biophys Res Commun / Year: 2026Title: Cryo-EM structure of RubisCO from Nitrosospira multiformis. Authors: Yoshiki Tanaka / Yuki Nishigaya / ![]() Abstract: Nitrosospira multiformis is a soil ammonia-oxidizing bacterium (AOB) that fixes CO via RubisCO using energy derived from ammonia oxidation. Despite its ecological and agricultural relevance, the ...Nitrosospira multiformis is a soil ammonia-oxidizing bacterium (AOB) that fixes CO via RubisCO using energy derived from ammonia oxidation. Despite its ecological and agricultural relevance, the structure of N. multiformis RubisCO (NmRubisCO) remained unknown. Here, we report the cryo-EM structure of NmRubisCO at 2.26 Å resolution, determined through single-particle analysis of protein copurified with the membrane fraction following cell lysis and ultracentrifugation without column chromatography. Analysis revealed an LS hexadecameric Form IC (red-like) RubisCO with a six-residue insertion in the βB-βC loop (BC loop) of the large-subunit N-terminal domain that forms a solvent-exposed, well-ordered protrusion. The active site lacks carbamylation at K206 and Mg binding, representing an inactive state. A putative metal ion coordinated by H296, H298, and H331, tentatively assigned as Zn based on coordination geometry and distances, was identified near the catalytic center; this His-coordinated metal site has not been described in other RubisCO structures. Loop 6 adopts a closed-like conformation in the absence of substrate, a configuration consistent with a potential requirement for activase-mediated remodeling. The C-terminal extension of the small subunit forms interdimer β-sheet interactions that stabilize the holoenzyme. These structural features provide a framework for understanding Form IC RubisCO in carboxysome-less soil AOB. | |||||||||||||||||||||||||||
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Structure visualization
| Structure viewer | Molecule: Molmil Jmol/JSmol |
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| PDBx/mmCIF format | 25hn.cif.gz | 957.8 KB | Display | PDBx/mmCIF format |
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| PDB format | pdb25hn.ent.gz | 772.6 KB | Display | PDB format |
| PDBx/mmJSON format | 25hn.json.gz | Tree view | PDBx/mmJSON format | |
| Others | Other downloads |
-Validation report
| Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/5h/25hn ftp://data.pdbj.org/pub/pdb/validation_reports/5h/25hn | HTTPS FTP |
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-Related structure data
| Related structure data | ![]() 80105MC M: map data used to model this data C: citing same article ( |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Assembly
| Deposited unit | ![]()
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| Noncrystallographic symmetry (NCS) | NCS domain:
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Nitrosospira multiformis ATCC 25196 (bacteria)
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