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- PDB-7m7h: 6-Deoxyerythronolide B synthase (DEBS) module 1 in complex with a... -
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Open data
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Basic information
Entry | Database: PDB / ID: 7m7h | ||||||
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Title | 6-Deoxyerythronolide B synthase (DEBS) module 1 in complex with antibody fragment 1B2: State 1' | ||||||
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![]() | BIOSYNTHETIC PROTEIN/IMMUNE SYSTEM / polyketide synthase / antibody fragment / BIOSYNTHETIC PROTEIN-IMMUNE SYSTEM complex | ||||||
Function / homology | ![]() 6-deoxyerythronolide-B synthase / erythronolide synthase activity / macrolide biosynthetic process / DIM/DIP cell wall layer assembly / fatty acid synthase activity / phosphopantetheine binding / 3-oxoacyl-[acyl-carrier-protein] synthase activity / antibiotic biosynthetic process / fatty acid biosynthetic process / plasma membrane / cytoplasm Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.1 Å | ||||||
![]() | Cogan, D.P. / Zhang, K. / Chiu, W. / Khosla, C. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Mapping the catalytic conformations of an assembly-line polyketide synthase module. Authors: Dillon P Cogan / Kaiming Zhang / Xiuyuan Li / Shanshan Li / Grigore D Pintilie / Soung-Hun Roh / Charles S Craik / Wah Chiu / Chaitan Khosla / ![]() ![]() ![]() Abstract: Assembly-line polyketide synthases, such as the 6-deoxyerythronolide B synthase (DEBS), are large enzyme factories prized for their ability to produce specific and complex polyketide products. By ...Assembly-line polyketide synthases, such as the 6-deoxyerythronolide B synthase (DEBS), are large enzyme factories prized for their ability to produce specific and complex polyketide products. By channeling protein-tethered substrates across multiple active sites in a defined linear sequence, these enzymes facilitate programmed small-molecule syntheses that could theoretically be harnessed to access countless polyketide product structures. Using cryogenic electron microscopy to study DEBS module 1, we present a structural model describing this substrate-channeling phenomenon. Our 3.2- to 4.3-angstrom-resolution structures of the intact module reveal key domain-domain interfaces and highlight an unexpected module asymmetry. We also present the structure of a product-bound module that shines light on a recently described “turnstile” mechanism for transient gating of active sites along the assembly line. | ||||||
History |
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Structure visualization
Movie |
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 606.3 KB | Display | ![]() |
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PDB format | ![]() | 501.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 860.8 KB | Display | ![]() |
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Full document | ![]() | 941.9 KB | Display | |
Data in XML | ![]() | 97.4 KB | Display | |
Data in CIF | ![]() | 150 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 23713MC ![]() 7m7eC ![]() 7m7fC ![]() 7m7gC ![]() 7m7iC ![]() 7m7jC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 188550.891 Da / Num. of mol.: 2 Fragment: EryA1 (UNP residues 225-2010) + EryA3 (UNP residues 2896-3172) Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() References: UniProt: Q5UNP6, UniProt: Q03133, 6-deoxyerythronolide-B synthase #2: Antibody | Mass: 26447.611 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #3: Antibody | Mass: 25715.832 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Complex between DEBS (3)M1TE and antibody fragment 1B2 Type: COMPLEX / Entity ID: all / Source: MULTIPLE SOURCES | ||||||||||||||||||||
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Molecular weight | Value: 0.48 MDa / Experimental value: NO | ||||||||||||||||||||
Source (natural) | Organism: ![]() | ||||||||||||||||||||
Source (recombinant) | Organism: ![]() ![]() | ||||||||||||||||||||
Buffer solution | pH: 7.2 | ||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 10 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Average exposure time: 8.5 sec. / Electron dose: 50 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.19_4092: / Classification: refinement | ||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
Particle selection | Num. of particles selected: 1406538 | ||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||
3D reconstruction | Resolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 58206 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
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