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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-9774 | |||||||||||||||
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Title | Capsid structure of a freshwater cyanophage Siphoviridae Mic1 | |||||||||||||||
![]() | the mrc map after postprocess | |||||||||||||||
![]() | Cyanophage != Microcystis phage Mic1 Cyanophage
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![]() | cyanophage / Siphoviridae / capsid / VIRUS | |||||||||||||||
Function / homology | Cement / Major capsid protein![]() | |||||||||||||||
Biological species | ![]() | |||||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.53 Å | |||||||||||||||
![]() | Jin H / Jiang YL | |||||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Capsid Structure of a Freshwater Cyanophage Siphoviridae Mic1. Authors: Hua Jin / Yong-Liang Jiang / Feng Yang / Jun-Tao Zhang / Wei-Fang Li / Ke Zhou / Jue Ju / Yuxing Chen / Cong-Zhao Zhou / ![]() Abstract: Cyanobacteria are the most abundant photosynthetic microorganisms, the global distribution of which is mainly regulated by the corresponding cyanophages. A systematic screening of water samples in ...Cyanobacteria are the most abundant photosynthetic microorganisms, the global distribution of which is mainly regulated by the corresponding cyanophages. A systematic screening of water samples in the Lake Chaohu enabled us to isolate a freshwater siphocyanophage that infects Microcystis wesenbergii, thus termed Mic1. Using cryoelectron microscopy, we solved the 3.5-Å structure of Mic1 capsid. The major capsid protein gp40 of an HK97-like fold forms two types of capsomers, hexons and pentons. The capsomers interact with each other via the interweaved N-terminal arms of gp40 in addition to a tail-in-mouth joint along the three-fold symmetric axis, resulting in the assembly of capsid in a mortise-and-tenon pattern. The novel-fold cement protein gp47 sticks at the two-fold symmetric axis and further fixes the capsid. These findings provide structural insights into the assembly of cyanophages, and set up a platform to explore the mechanism of specific interactions and co-evolution with cyanobacteria. | |||||||||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 305 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 14.2 KB 14.2 KB | Display Display | ![]() |
Images | ![]() | 338.5 KB | ||
Filedesc metadata | ![]() | 5.6 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 6j3qMC M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | the mrc map after postprocess | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.36 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : Cyanophage
Entire | Name: Cyanophage |
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Components |
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-Supramolecule #1: Microcystis phage Mic1
Supramolecule | Name: Microcystis phage Mic1 / type: virus / ID: 1 / Parent: 0 / Macromolecule list: all / NCBI-ID: 2587456 / Sci species name: Microcystis phage Mic1 / Virus type: VIRION / Virus isolate: SPECIES / Virus enveloped: No / Virus empty: No |
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Host (natural) | Organism: ![]() |
Virus shell | Shell ID: 1 / Name: gp40 / Diameter: 880.0 Å / T number (triangulation number): 13 |
-Macromolecule #1: major capsid protein
Macromolecule | Name: major capsid protein / type: protein_or_peptide / ID: 1 / Number of copies: 13 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 37.879035 KDa |
Sequence | String: MAKLNLAVLN NVFSELLTQE INRSATFLGL LSKYPERKSN IQWGVGMGGT TATGVAITGS APAASMDATL PAQLPISAAS VQSTFTLNL KEIEESKEQV TNEELRNLLE AQMRNAVEEI ATTLNKKLYD GSGAIADGGL IGLSIAASGQ DYAGISSATY P LWNVSEVD ...String: MAKLNLAVLN NVFSELLTQE INRSATFLGL LSKYPERKSN IQWGVGMGGT TATGVAITGS APAASMDATL PAQLPISAAS VQSTFTLNL KEIEESKEQV TNEELRNLLE AQMRNAVEEI ATTLNKKLYD GSGAIADGGL IGLSIAASGQ DYAGISSATY P LWNVSEVD AWDANATGTD KRQALKTDFM LELDRKIRYR PGAYDLILTT PKVVEQYKKV FEANRSYQIM TFDGQRVPLI DL GFNVAGY MGRPIIDDVF CSRTRTAAES AITTALGTAV DEGVMYFLKK DDLRFYSTPV VGAFSANGVY TLMRQLAQTS LYV DNFVVG CIPQLQLTTR KNVGVIKNIK VG |
-Macromolecule #2: cement protein
Macromolecule | Name: cement protein / type: protein_or_peptide / ID: 2 / Number of copies: 13 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 10.199458 KDa |
Sequence | String: MPLVYTPAVR GGANPASGSY LLDPQYVNSG VDILQATYGY NINGTANADQ LLQRDAILAI LEYALKDTAF VNAIQAVAAG SGVTTPASF VSACVTKLTA |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 / Details: 50 mM Tris-HCl pH7.5, 100 mM NaCl, 10 mM MgSO4 |
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Grid | Model: Quantifoil R3.5/1 / Material: COPPER / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 10 sec. |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK I |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Number grids imaged: 1 / Number real images: 1935 / Average exposure time: 5.76 sec. / Average electron dose: 25.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 59000 |
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
Refinement | Protocol: AB INITIO MODEL |
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Output model | ![]() PDB-6j3q: |