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- PDB-6pxe: Crystal structure of the complex between periplasmic domains of a... -
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Open data
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Basic information
Entry | Database: PDB / ID: 6pxe | ||||||
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Title | Crystal structure of the complex between periplasmic domains of antiholin RI and holin T from T4 phage, in P21 | ||||||
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![]() | VIRAL PROTEIN / phage / lysis inhibition | ||||||
Function / homology | ![]() host cell periplasmic space / pore-forming activity / molecular function inhibitor activity / viral release from host cell by cytolysis / killing of cells of another organism / host cell plasma membrane / DNA binding / membrane Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ![]() ![]() ![]() | ||||||
![]() | Krieger, I.V. / Sacchettini, J.C. | ||||||
Funding support | ![]()
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![]() | ![]() Title: The Structural Basis of T4 Phage Lysis Control: DNA as the Signal for Lysis Inhibition. Authors: Inna V Krieger / Vladimir Kuznetsov / Jeng-Yih Chang / Junjie Zhang / Samir H Moussa / Ryland F Young / James C Sacchettini / ![]() Abstract: Optimal phage propagation depends on the regulation of the lysis of the infected host cell. In T4 phage infection, lysis occurs when the holin protein (T) forms lesions in the host membrane. However, ...Optimal phage propagation depends on the regulation of the lysis of the infected host cell. In T4 phage infection, lysis occurs when the holin protein (T) forms lesions in the host membrane. However, the lethal function of T can be blocked by an antiholin (RI) during lysis inhibition (LIN). LIN sets if the infected cell undergoes superinfection, then the lysis is delayed until host/phage ratio becomes more favorable for the release of progeny. It has been thought that a signal derived from the superinfection is required to activate RI. Here we report structures that suggest a radically different model in which RI binds to T irrespective of superinfection, causing it to accumulate in a membrane as heterotetrameric 2RI-2T complex. Moreover, we show the complex binds non-specifically to DNA, suggesting that the gDNA from the superinfecting phage serves as the LIN signal and that stabilization of the complex by DNA binding is what defines LIN. Finally, we show that soluble domain of free RI crystallizes in a domain-swapped homotetramer, which likely works as a sink for RI molecules released from the RI-T complex to ensure efficient lysis. These results constitute the first structural basis and a new model not only for the historic LIN phenomenon but also for the temporal regulation of phage lysis in general. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 188 KB | Display | ![]() |
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PDB format | ![]() | 148.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 6pshC ![]() 6pskSC ![]() 6px4C S: Starting model for refinement 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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1 | ![]()
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2 | ![]()
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Unit cell |
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Components
#1: Protein | Mass: 8801.884 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #2: Protein | Mass: 19211.615 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #3: Water | ChemComp-HOH / | |
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-Experimental details
-Experiment
Experiment | Method: ![]() |
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Sample preparation
Crystal | Density Matthews: 2.3 Å3/Da / Density % sol: 46.63 % |
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Crystal grow | Temperature: 289 K / Method: vapor diffusion, sitting drop / pH: 3.5 / Details: 25% PEG 3,350 with 0.1M citric acid pH 3.5 |
-Data collection
Diffraction | Mean temperature: 120 K / Serial crystal experiment: N |
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Diffraction source | Source: ![]() ![]() ![]() |
Detector | Type: MAR scanner 300 mm plate / Detector: IMAGE PLATE / Date: Nov 12, 2014 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 0.987 Å / Relative weight: 1 |
Reflection | Resolution: 2.3→45.8 Å / Num. obs: 44230 / % possible obs: 97.4 % / Redundancy: 5.07 % / Biso Wilson estimate: 35.29 Å2 / Rmerge(I) obs: 0.1506 / Net I/σ(I): 7.57 |
Reflection shell | Resolution: 2.3→2.34 Å / Rmerge(I) obs: 0.7874 / Num. unique obs: 2168 |
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Processing
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Refinement | Method to determine structure: ![]() Starting model: 6PSK Resolution: 2.3→39.803 Å / SU ML: 0.39 / Cross valid method: THROUGHOUT / σ(F): 1.36 / Phase error: 33.14
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Solvent computation | Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso max: 84.32 Å2 / Biso mean: 37.7695 Å2 / Biso min: 14.41 Å2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: final / Resolution: 2.3→39.803 Å
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Refine LS restraints |
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LS refinement shell | Refine-ID: X-RAY DIFFRACTION / Rfactor Rfree error: 0
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