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- EMDB-29383: Structure of baseplate with receptor binding complex of Agrobacte... -
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Open data
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Basic information
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Title | Structure of baseplate with receptor binding complex of Agrobacterium phage Milano | |||||||||
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![]() | Myophage / redox trigger / disulfides / VIRUS | |||||||||
Function / homology | ![]() | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.2 Å | |||||||||
![]() | Sonani RR / Leiman PG / Wang F / Kreutzberger MAB / Sebastian A / Esteves NC / Kelly RJ / Scharf B / Egelman EH | |||||||||
Funding support | ![]()
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![]() | ![]() Title: An extensive disulfide bond network prevents tail contraction in Agrobacterium tumefaciens phage Milano. Authors: Ravi R Sonani / Lee K Palmer / Nathaniel C Esteves / Abigail A Horton / Amanda L Sebastian / Rebecca J Kelly / Fengbin Wang / Mark A B Kreutzberger / William K Russell / Petr G Leiman / ...Authors: Ravi R Sonani / Lee K Palmer / Nathaniel C Esteves / Abigail A Horton / Amanda L Sebastian / Rebecca J Kelly / Fengbin Wang / Mark A B Kreutzberger / William K Russell / Petr G Leiman / Birgit E Scharf / Edward H Egelman / ![]() Abstract: A contractile sheath and rigid tube assembly is a widespread apparatus used by bacteriophages, tailocins, and the bacterial type VI secretion system to penetrate cell membranes. In this mechanism, ...A contractile sheath and rigid tube assembly is a widespread apparatus used by bacteriophages, tailocins, and the bacterial type VI secretion system to penetrate cell membranes. In this mechanism, contraction of an external sheath powers the motion of an inner tube through the membrane. The structure, energetics, and mechanism of the machinery imply rigidity and straightness. The contractile tail of Agrobacterium tumefaciens bacteriophage Milano is flexible and bent to varying degrees, which sets it apart from other contractile tail-like systems. Here, we report structures of the Milano tail including the sheath-tube complex, baseplate, and putative receptor-binding proteins. The flexible-to-rigid transformation of the Milano tail upon contraction can be explained by unique electrostatic properties of the tail tube and sheath. All components of the Milano tail, including sheath subunits, are crosslinked by disulfides, some of which must be reduced for contraction to occur. The putative receptor-binding complex of Milano contains a tailspike, a tail fiber, and at least two small proteins that form a garland around the distal ends of the tailspikes and tail fibers. Despite being flagellotropic, Milano lacks thread-like tail filaments that can wrap around the flagellum, and is thus likely to employ a different binding mechanism. | |||||||||
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 65.2 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 24.9 KB 24.9 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 19.1 KB | Display | ![]() |
Images | ![]() | 127.2 KB | ||
Filedesc metadata | ![]() | 7.9 KB | ||
Others | ![]() ![]() | 682.8 MB 682.8 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8fqcMC ![]() 8fopC ![]() 8fouC ![]() 8foyC 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
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Voxel size | X=Y=Z: 1.08 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #2
File | emd_29383_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #1
File | emd_29383_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
+Entire : Agrobacterium phage Milano
+Supramolecule #1: Agrobacterium phage Milano
+Macromolecule #1: Baseplate hub protein, gp26
+Macromolecule #2: Tail-tube, gp21
+Macromolecule #3: Baseplate Wedge 2 protein, gp29
+Macromolecule #4: Baseplate wedge 1, gp28
+Macromolecule #5: Tail sheath protein, gp20
+Macromolecule #6: Baseplate Wedge 3 protein, gp30
+Macromolecule #7: Tail Spike protein, gp124
+Macromolecule #8: Short Tail Fibers, gp31
+Macromolecule #9: Baseplate Centerpiece, gp25
+Macromolecule #10: Baseplate Central Spike, gp27
+Macromolecule #11: FE (III) ION
-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 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.2 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |