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- EMDB-42114: Cryo-EM structure of the AlbAB cyclodipeptide oxidase enzyme filament -
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Open data
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Basic information
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Title | Cryo-EM structure of the AlbAB cyclodipeptide oxidase enzyme filament | |||||||||
![]() | structure of the AlbAB cyclodipeptide oxidase enzyme filament | |||||||||
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![]() | cyclodipeptide oxidase / cyclic dipeptide oxidase / nitroreductase-like / enzyme filament / flavoenzyme / OXIDOREDUCTASE | |||||||||
Function / homology | ![]() albonoursin synthase / oxidoreductase activity, acting on the CH-CH group of donors, oxygen as acceptor / cytoplasm Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | helical reconstruction / cryo EM / Resolution: 2.78 Å | |||||||||
![]() | Andreas MP / Giessen TW | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Cyclodipeptide oxidase is an enzyme filament. Authors: Michael P Andreas / Tobias W Giessen / ![]() Abstract: Modified cyclic dipeptides represent a widespread class of secondary metabolites with diverse pharmacological activities, including antibacterial, antifungal, and antitumor. Here, we report the ...Modified cyclic dipeptides represent a widespread class of secondary metabolites with diverse pharmacological activities, including antibacterial, antifungal, and antitumor. Here, we report the structural characterization of the Streptomyces noursei enzyme AlbAB, a cyclodipeptide oxidase (CDO) carrying out α,β-dehydrogenations during the biosynthesis of the antibiotic albonoursin. We show that AlbAB is a megadalton heterooligomeric enzyme filament containing covalently bound flavin mononucleotide cofactors. We highlight that AlbAB filaments consist of alternating dimers of AlbA and AlbB and that enzyme activity is crucially dependent on filament formation. We show that AlbA-AlbB interactions are highly conserved suggesting that other CDO-like enzymes are likely enzyme filaments. As CDOs have been employed in the structural diversification of cyclic dipeptides, our results will be useful for future applications of CDOs in biocatalysis and chemoenzymatic synthesis. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 167.9 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 19.4 KB 19.4 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 11.9 KB | Display | ![]() |
Images | ![]() | 73.1 KB | ||
Filedesc metadata | ![]() | 6.5 KB | ||
Others | ![]() ![]() | 165.2 MB 165.2 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 984.4 KB | Display | ![]() |
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Full document | ![]() | 984 KB | Display | |
Data in XML | ![]() | 20.7 KB | Display | |
Data in CIF | ![]() | 26.8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8uc3MC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||
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Annotation | structure of the AlbAB cyclodipeptide oxidase enzyme filament | ||||||||||||||||||||
Voxel size | X=Y=Z: 0.8487 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: Half Map 1
File | emd_42114_half_map_1.map | ||||||||||||
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Annotation | Half Map 1 | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Half Map 2
File | emd_42114_half_map_2.map | ||||||||||||
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Annotation | Half Map 2 | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
-Entire : AlbAB cyclodipeptide oxidase enzyme filament
Entire | Name: AlbAB cyclodipeptide oxidase enzyme filament |
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Components |
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-Supramolecule #1: AlbAB cyclodipeptide oxidase enzyme filament
Supramolecule | Name: AlbAB cyclodipeptide oxidase enzyme filament / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2 |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: Albonoursin synthase
Macromolecule | Name: Albonoursin synthase / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 21.071307 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MLAHSSSESP PESLPDAWTV LKTRTAVRNY AKEPVDDALI EQLLEAMLAA PTASNRQAWS FMVVRRPAAV RRLRAFSPGV LGTPAFFVV ACVDRSLTDN LSPKLSQKIY DTSKLCVAMA VENLLLAAHA AGLGGCPVGS FRSDIVTSML GIPEHIEPML V VPIGRPAT ...String: MLAHSSSESP PESLPDAWTV LKTRTAVRNY AKEPVDDALI EQLLEAMLAA PTASNRQAWS FMVVRRPAAV RRLRAFSPGV LGTPAFFVV ACVDRSLTDN LSPKLSQKIY DTSKLCVAMA VENLLLAAHA AGLGGCPVGS FRSDIVTSML GIPEHIEPML V VPIGRPAT ALVPSQRRAK NEVVNYESWG NRAAAPTA UniProtKB: Albonoursin synthase |
-Macromolecule #2: Protein AlbB
Macromolecule | Name: Protein AlbB / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 11.583143 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MNPGETVLPP QLREEIALLA VYLLSSGRGL LEEPADYGIY RCTDGARRAL QLLDEHGGST ARLTAVRERL DEVMFAPMGE DRDMGAILD DLCRQMADAL PEIETP UniProtKB: Protein AlbB |
-Macromolecule #3: FLAVIN MONONUCLEOTIDE
Macromolecule | Name: FLAVIN MONONUCLEOTIDE / type: ligand / ID: 3 / Number of copies: 2 / Formula: FMN |
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Molecular weight | Theoretical: 456.344 Da |
Chemical component information | ![]() ChemComp-FMN: |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | helical reconstruction |
Aggregation state | filament |
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Sample preparation
Concentration | 0.75 mg/mL | |||||||||
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Buffer | pH: 7.5 Component:
Details: 20 mM NaCl, 150 mM Tris pH 7.5 | |||||||||
Grid | Model: Quantifoil R2/1 / Material: COPPER / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec. / Pretreatment - Atmosphere: AIR Details: Grid was glow discharged for 60 seconds at 5 mA under vacuum | |||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 295 K / Instrument: FEI VITROBOT MARK IV Details: Grid was plunge frozen into liquid ethane using the following parameters: blot force- 5, blot time 2 seconds. |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Digitization - Dimensions - Width: 4092 pixel / Digitization - Dimensions - Height: 5760 pixel / Number grids imaged: 1 / Number real images: 3015 / Average exposure time: 2.03063 sec. / Average electron dose: 50.12 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 100.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 105000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Initial model | Chain - Source name: AlphaFold / Chain - Initial model type: in silico model |
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Details | A model of AlbAB was created using AlphaFold2 using MMseqs2 via ColabFold. The model was then fit into the cryoEM density using ChimeraX. The model was then iteratively refined using Coot v 0.9.8.1 and real-space refinement in Phenix v 1.20.1-4487. |
Refinement | Space: REAL / Protocol: FLEXIBLE FIT / Overall B value: 107.4 / Target criteria: Cross-correlation coefficient |
Output model | ![]() PDB-8uc3: |