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Open data
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Basic information
Entry | Database: PDB / ID: 7yfz | ||||||
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Title | Cyanophage Pam3 baseplate proteins | ||||||
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![]() | VIRAL PROTEIN / baseplate / VIRUS | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.19 Å | ||||||
![]() | Yang, F. / Jiang, Y.L. / Zhou, C.Z. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Fine structure and assembly pattern of a minimal myophage Pam3. Authors: Feng Yang / Yong-Liang Jiang / Jun-Tao Zhang / Jie Zhu / Kang Du / Rong-Cheng Yu / Zi-Lu Wei / Wen-Wen Kong / Ning Cui / Wei-Fang Li / Yuxing Chen / Qiong Li / Cong-Zhao Zhou / ![]() Abstract: The myophage possesses a contractile tail that penetrates its host cell envelope. Except for investigations on the bacteriophage T4 with a rather complicated structure, the assembly pattern and tail ...The myophage possesses a contractile tail that penetrates its host cell envelope. Except for investigations on the bacteriophage T4 with a rather complicated structure, the assembly pattern and tail contraction mechanism of myophage remain largely unknown. Here, we present the fine structure of a freshwater cyanophage Pam3, which has an icosahedral capsid of ~680 Å in diameter, connected via a three-section neck to an 840-Å-long contractile tail, ending with a three-module baseplate composed of only six protein components. This simplified baseplate consists of a central hub-spike surrounded by six wedge heterotriplexes, to which twelve tail fibers are covalently attached via disulfide bonds in alternating upward and downward configurations. In vitro reduction assays revealed a putative redox-dependent mechanism of baseplate assembly and tail sheath contraction. These findings establish a minimal myophage that might become a user-friendly chassis phage in synthetic biology. | ||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 2.5 MB | Display | ![]() |
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PDB format | ![]() | Display | ![]() | |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.3 MB | Display | ![]() |
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Full document | ![]() | 1.4 MB | Display | |
Data in XML | ![]() | 195.6 KB | Display | |
Data in CIF | ![]() | 316.9 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 33802MC ![]() 7yfwC ![]() 8hdrC ![]() 8hdsC ![]() 8hdtC ![]() 8hdwC M: map data used to model this data C: citing same article ( |
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Links
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Assembly
Deposited unit | ![]()
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Components
-Pam3 baseplate wedge ... , 2 types, 18 molecules ABEFHIKLOPQRCDGJMS
#1: Protein | Mass: 32686.787 Da / Num. of mol.: 12 / Source method: isolated from a natural source Source: (natural) ![]() #2: Protein | Mass: 26194.811 Da / Num. of mol.: 6 / Source method: isolated from a natural source Source: (natural) ![]() |
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-Protein , 5 types, 24 molecules Xnopqrabcdefhijklmtuvwxy
#3: Protein | Mass: 13889.669 Da / Num. of mol.: 6 / Source method: isolated from a natural source Source: (natural) ![]() #4: Protein | Mass: 19854.342 Da / Num. of mol.: 6 / Source method: isolated from a natural source Source: (natural) ![]() #5: Protein | Mass: 11724.286 Da / Num. of mol.: 6 / Source method: isolated from a natural source Source: (natural) ![]() #6: Protein | Mass: 25201.736 Da / Num. of mol.: 3 / Source method: isolated from a natural source Source: (natural) ![]() #7: Protein | Mass: 23537.537 Da / Num. of mol.: 3 / Source method: isolated from a natural source Source: (natural) ![]() |
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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: uncultured cyanophage / Type: VIRUS / Entity ID: all / Source: NATURAL |
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Source (natural) | Organism: ![]() |
Details of virus | Empty: NO / Enveloped: NO / Isolate: OTHER / Type: VIRION |
Natural host | Organism: Pseudanabaena mucicola |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 300 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 / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
EM software | Name: RELION / Version: 3.1 / Category: 3D reconstruction |
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CTF correction | Type: PHASE FLIPPING ONLY |
3D reconstruction | Resolution: 3.19 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 45155 / Symmetry type: POINT |