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- EMDB-26566: Bacteriophage Lambda Red-Beta N-terminal domain helical assembly ... -
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Open data
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Basic information
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Title | Bacteriophage Lambda Red-Beta N-terminal domain helical assembly in complex with dsDNA | |||||||||
![]() | Symmetrised, sharpened map of the RedBeta177 helical assembly bound to dsDNA | |||||||||
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![]() | Annealase / Synaptase / SSAP / Single-strand annealing protein / DNA annealing intermediate / Recombinase / Two-component recombinase / Viral / DNA-binding / RECOMBINATION-DNA complex | |||||||||
Function / homology | Bacteriophage lambda, Recombination protein bet / RecT family / RecT family / DNA recombination / DNA binding / Recombination protein bet![]() | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | helical reconstruction / cryo EM / Resolution: 3.3 Å | |||||||||
![]() | Newing TP / Tolun G | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Redβ annealase structure reveals details of oligomerization and λ Red-mediated homologous DNA recombination. Authors: Timothy P Newing / Jodi L Brewster / Lucy J Fitschen / James C Bouwer / Nikolas P Johnston / Haibo Yu / Gökhan Tolun / ![]() Abstract: The Redβ protein of the bacteriophage λ red recombination system is a model annealase which catalyzes single-strand annealing homologous DNA recombination. Here we present the structure of a ...The Redβ protein of the bacteriophage λ red recombination system is a model annealase which catalyzes single-strand annealing homologous DNA recombination. Here we present the structure of a helical oligomeric annealing intermediate of Redβ, consisting of N-terminal residues 1-177 bound to two complementary 27mer oligonucleotides, determined via cryogenic electron microscopy (cryo-EM) to a final resolution of 3.3 Å. The structure reveals a continuous binding groove which positions and stabilizes complementary DNA strands in a planar orientation to facilitate base pairing via a network of hydrogen bonding. Definition of the inter-subunit interface provides a structural basis for the propensity of Redβ to oligomerize into functionally significant long helical filaments, a trait shared by most annealases. Our cryo-EM structure and molecular dynamics simulations suggest that residues 133-138 form a flexible loop which modulates access to the binding groove. More than half a century after its discovery, this combination of structural and computational observations has allowed us to propose molecular mechanisms for the actions of the model annealase Redβ, a defining member of the Redβ/RecT protein family. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 106.4 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 21.6 KB 21.6 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 15.9 KB | Display | ![]() |
Images | ![]() | 175.3 KB | ||
Masks | ![]() | 343 MB | ![]() | |
Filedesc metadata | ![]() | 6.8 KB | ||
Others | ![]() ![]() | 318.4 MB 318.4 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7ujlMC 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
File | ![]() | ||||||||||||||||||||
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Annotation | Symmetrised, sharpened map of the RedBeta177 helical assembly bound to dsDNA | ||||||||||||||||||||
Voxel size | X=Y=Z: 0.84 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Mask #1
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Projections & Slices |
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Density Histograms |
-Half map: Unfiltered half map B of the RedBeta177 helical...
File | emd_26566_half_map_1.map | ||||||||||||
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Annotation | Unfiltered half map B of the RedBeta177 helical assembly bound to dsDNA | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Unfiltered half map A of the RedBeta177 helical...
File | emd_26566_half_map_2.map | ||||||||||||
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Annotation | Unfiltered half map A of the RedBeta177 helical assembly bound to dsDNA | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
-Entire : RedBeta177 oligomeric helical assembly bound to two complementary...
Entire | Name: RedBeta177 oligomeric helical assembly bound to two complementary 27mer ssDNA oligonucleotides |
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Components |
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-Supramolecule #1: RedBeta177 oligomeric helical assembly bound to two complementary...
Supramolecule | Name: RedBeta177 oligomeric helical assembly bound to two complementary 27mer ssDNA oligonucleotides type: complex / ID: 1 / Parent: 0 / Macromolecule list: all Details: Helical complex assembled through sequential addition of complementary oligonucleotides in a controlled environment |
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Molecular weight | Theoretical: 102.26 kDa/nm |
-Supramolecule #2: Red-beta annealase N-terminal domain
Supramolecule | Name: Red-beta annealase N-terminal domain / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1 |
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Source (natural) | Organism: ![]() |
-Supramolecule #3: Template ssDNA
Supramolecule | Name: Template ssDNA / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2 / Details: 27mer ssDNA oligonucleotide |
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Source (natural) | Organism: ![]() ![]() |
-Supramolecule #4: Complementary ssDNA
Supramolecule | Name: Complementary ssDNA / type: complex / ID: 4 / Parent: 1 / Macromolecule list: #3 / Details: 27mer ssDNA oligonucleotide |
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Source (natural) | Organism: ![]() ![]() |
-Macromolecule #1: Recombination protein bet
Macromolecule | Name: Recombination protein bet / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 21.275008 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MSTALATLAG KLAERVGMDS VDPQELITTL RQTAFKGDAS DAQFIALLIV ANQYGLNPWT KEIYAFPDKQ NGIVPVVGVD GWSRIINEN QQFDGMDFEQ DNESCTCRIY RKDRNHPICV TEWMDECRRE PFKTREGREI TGPWQSHPKR MLRHKAMIQC A RLAFGFAG IYDKDEAERS SHHHHHH UniProtKB: Recombination protein bet |
-Macromolecule #2: Template DNA
Macromolecule | Name: Template DNA / type: dna / ID: 2 / Number of copies: 1 / Classification: DNA |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 8.244295 KDa |
Sequence | String: (DT)(DG)(DC)(DA)(DG)(DC)(DA)(DG)(DC)(DT) (DT)(DT)(DA)(DC)(DC)(DA)(DT)(DC)(DT)(DG) (DC)(DC)(DG)(DC)(DT)(DG)(DG) |
-Macromolecule #3: Complementary DNA
Macromolecule | Name: Complementary DNA / type: dna / ID: 3 / Number of copies: 1 / Classification: DNA |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 8.351386 KDa |
Sequence | String: (DC)(DC)(DA)(DG)(DC)(DG)(DG)(DC)(DA)(DG) (DA)(DT)(DG)(DG)(DT)(DA)(DA)(DA)(DG)(DC) (DT)(DG)(DC)(DT)(DG)(DC)(DA) |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | helical reconstruction |
Aggregation state | helical array |
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Sample preparation
Concentration | 2.6 mg/mL | |||||||||
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Buffer | pH: 6 Component:
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Grid | Model: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: GOLD / Support film - topology: HOLEY / Support film - Film thickness: 50 / Pretreatment - Type: GLOW DISCHARGE | |||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK IV Details: Sample loading volume ranged between 2 and 3 microlitres. Samples were blotted for 5 seconds prior to vitrification.. |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Specialist optics | Energy filter - Name: GIF Quantum LS / Details: Installed but not used |
Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 3838 pixel / Digitization - Dimensions - Height: 3710 pixel / Digitization - Frames/image: 1-50 / Number grids imaged: 1 / Number real images: 4710 / Average exposure time: 9.0 sec. / Average electron dose: 50.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Calibrated magnification: 59500 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.5 µm |
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 | Space: REAL / Protocol: FLEXIBLE FIT / Target criteria: Correlation coefficient |
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Output model | ![]() PDB-7ujl: |