+Open data
-Basic information
Entry | Database: EMDB / ID: EMD-41579 | |||||||||
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Title | Structure of full-length LexA bound to a RecA filament | |||||||||
Map data | Sharpened map used for model building and refinement | |||||||||
Sample |
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Keywords | Damage response / signal transduction / SIGNALING PROTEIN / SIGNALING PROTEIN-DNA complex | |||||||||
Function / homology | Function and homology information repressor LexA / DNA polymerase V complex / homologous recombination / recombinational repair / ATP-dependent DNA damage sensor activity / DNA-binding transcription repressor activity / response to ionizing radiation / SOS response / translesion synthesis / ATP-dependent activity, acting on DNA ...repressor LexA / DNA polymerase V complex / homologous recombination / recombinational repair / ATP-dependent DNA damage sensor activity / DNA-binding transcription repressor activity / response to ionizing radiation / SOS response / translesion synthesis / ATP-dependent activity, acting on DNA / cell motility / protein-DNA complex / single-stranded DNA binding / DNA-binding transcription factor binding / DNA recombination / DNA replication / damaged DNA binding / transcription cis-regulatory region binding / serine-type endopeptidase activity / DNA repair / negative regulation of DNA-templated transcription / DNA-templated transcription / DNA damage response / ATP hydrolysis activity / proteolysis / DNA binding / ATP binding / identical protein binding / cytosol / cytoplasm Similarity search - Function | |||||||||
Biological species | Escherichia coli (E. coli) | |||||||||
Method | helical reconstruction / cryo EM / Resolution: 2.93 Å | |||||||||
Authors | Cory MB / Li A / Kohli RM | |||||||||
Funding support | United States, 1 items
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Citation | Journal: Nat Struct Mol Biol / Year: 2024 Title: The LexA-RecA* structure reveals a cryptic lock-and-key mechanism for SOS activation. Authors: Michael B Cory / Allen Li / Christina M Hurley / Peter J Carman / Ruth A Pumroy / Zachary M Hostetler / Ryann M Perez / Yarra Venkatesh / Xinning Li / Kushol Gupta / E James Petersson / Rahul M Kohli / Abstract: The bacterial SOS response plays a key role in adaptation to DNA damage, including genomic stress caused by antibiotics. SOS induction begins when activated RecA*, an oligomeric nucleoprotein ...The bacterial SOS response plays a key role in adaptation to DNA damage, including genomic stress caused by antibiotics. SOS induction begins when activated RecA*, an oligomeric nucleoprotein filament that forms on single-stranded DNA, binds to and stimulates autoproteolysis of the repressor LexA. Here, we present the structure of the complete Escherichia coli SOS signal complex, constituting full-length LexA bound to RecA*. We uncover an extensive interface unexpectedly including the LexA DNA-binding domain, providing a new molecular rationale for ordered SOS gene induction. We further find that the interface involves three RecA subunits, with a single residue in the central engaged subunit acting as a molecular key, inserting into an allosteric binding pocket to induce LexA cleavage. Given the pro-mutagenic nature of SOS activation, our structural and mechanistic insights provide a foundation for developing new therapeutics to slow the evolution of antibiotic resistance. | |||||||||
History |
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-Structure visualization
Supplemental images |
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-Downloads & links
-EMDB archive
Map data | emd_41579.map.gz | 57.7 MB | EMDB map data format | |
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Header (meta data) | emd-41579-v30.xml emd-41579.xml | 25.4 KB 25.4 KB | Display Display | EMDB header |
FSC (resolution estimation) | emd_41579_fsc.xml emd_41579_fsc_2.xml | 8.4 KB 8.4 KB | Display Display | FSC data file |
Images | emd_41579.png | 84.9 KB | ||
Filedesc metadata | emd-41579.cif.gz | 7.6 KB | ||
Others | emd_41579_additional_1.map.gz emd_41579_half_map_1.map.gz emd_41579_half_map_2.map.gz | 32.5 MB 59.3 MB 59.3 MB | ||
Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-41579 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-41579 | HTTPS FTP |
-Related structure data
Related structure data | 8trgMC M: atomic model generated by this map C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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Related items in Molecule of the Month |
-Map
File | Download / File: emd_41579.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||
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Annotation | Sharpened map used for model building and refinement | ||||||||||||||||||||
Voxel size | X=Y=Z: 1.38 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Additional map: Unsharpened final map from data processing
File | emd_41579_additional_1.map | ||||||||||||
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Annotation | Unsharpened final map from data processing | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Half map of final map
File | emd_41579_half_map_1.map | ||||||||||||
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Annotation | Half map of final map | ||||||||||||
Projections & Slices |
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Density Histograms |
-Half map: Half map of final map
File | emd_41579_half_map_2.map | ||||||||||||
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Annotation | Half map of final map | ||||||||||||
Projections & Slices |
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Density Histograms |
-Sample components
-Entire : SOS Signal Complex consisting of RecA, ssDNA, and LexA
Entire | Name: SOS Signal Complex consisting of RecA, ssDNA, and LexA |
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Components |
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-Supramolecule #1: SOS Signal Complex consisting of RecA, ssDNA, and LexA
Supramolecule | Name: SOS Signal Complex consisting of RecA, ssDNA, and LexA type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3 |
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Source (natural) | Organism: Escherichia coli (E. coli) / Strain: K12 |
Molecular weight | Theoretical: 480 KDa |
-Supramolecule #2: RecA* activated filament
Supramolecule | Name: RecA* activated filament / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1, #3 |
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Source (natural) | Organism: Escherichia coli (E. coli) / Strain: K12 |
-Supramolecule #3: LexA Dimer
Supramolecule | Name: LexA Dimer / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2 |
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Source (natural) | Organism: Escherichia coli (E. coli) / Strain: K12 |
-Macromolecule #1: Protein RecA
Macromolecule | Name: Protein RecA / type: protein_or_peptide / ID: 1 / Number of copies: 8 / Enantiomer: LEVO |
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Source (natural) | Organism: Escherichia coli (E. coli) |
Molecular weight | Theoretical: 41.119551 KDa |
Recombinant expression | Organism: Escherichia coli (E. coli) |
Sequence | String: MGSSHHHHHH HHHHHHSSGE NLYFQGMAID ENKQKALAAA LGQIEKQFGK GSIMRLGEDR SMDVETISTG SLSLDIALGA GGLPMGRIV EIYGPESSGK TTLTLQVIAA AQREGKTCAF IDAEHALDPI YARKLGVDID NLLCSQPDTG EQALEICDAL A RSGAVDVI ...String: MGSSHHHHHH HHHHHHSSGE NLYFQGMAID ENKQKALAAA LGQIEKQFGK GSIMRLGEDR SMDVETISTG SLSLDIALGA GGLPMGRIV EIYGPESSGK TTLTLQVIAA AQREGKTCAF IDAEHALDPI YARKLGVDID NLLCSQPDTG EQALEICDAL A RSGAVDVI VVDSVAALTP KAEIEGEIGD SHMGLAARMM SQAMRKLAGN LKQSNTLLIF INQIRMKIGV MFGNPETTTG GN ALKFYAS VRLDIRRIGA VKEGENVVGS ETRVKVVKNK IAAPFKQAEF QILYGEGINF YGELVDLGVK EKLIEKAGAW YSY KGEKIG QGKANATAWL KDNPETAKEI EKKVRELLLS NPNSTPDFSV DDSEGVAETN EDF UniProtKB: Protein RecA |
-Macromolecule #2: LexA repressor
Macromolecule | Name: LexA repressor / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: Escherichia coli (E. coli) |
Molecular weight | Theoretical: 22.612887 KDa |
Recombinant expression | Organism: Escherichia coli BL21(DE3) (bacteria) |
Sequence | String: GSHMKALTAR QQEVFDLIRD HISQTGMPPT RAEIAQRLGF RSPNAAEEHL KALARKGVIE IVSGASRGIR LLQEEEEGLP LVGRVAAGE PLLAQQHIEG HYQVDPSLFK PNADFLLRVS GMSMKDIGIM DGDLLAVHKT QDVRNGQVVV ARIDDEVTVA R LKKQGNKV ...String: GSHMKALTAR QQEVFDLIRD HISQTGMPPT RAEIAQRLGF RSPNAAEEHL KALARKGVIE IVSGASRGIR LLQEEEEGLP LVGRVAAGE PLLAQQHIEG HYQVDPSLFK PNADFLLRVS GMSMKDIGIM DGDLLAVHKT QDVRNGQVVV ARIDDEVTVA R LKKQGNKV ELLPENSEFK PIVVDLRQQS FTIEGLAVGV IRNGDWL UniProtKB: LexA repressor |
-Macromolecule #3: DNA (27-MER)
Macromolecule | Name: DNA (27-MER) / type: dna / ID: 3 / Number of copies: 1 / Classification: DNA |
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Source (natural) | Organism: Escherichia coli (E. coli) |
Molecular weight | Theoretical: 8.618482 KDa |
Sequence | String: (DT)(DG)(DG)(DT)(DG)(DG)(DT)(DG)(DG)(DT) (DG)(DG)(DT)(DG)(DG)(DT)(DG)(DG)(DT)(DG) (DG)(DT)(DG)(DG)(DT)(DG)(DG) |
-Macromolecule #4: PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER
Macromolecule | Name: PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER / type: ligand / ID: 4 / Number of copies: 8 / Formula: AGS |
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Molecular weight | Theoretical: 523.247 Da |
Chemical component information | ChemComp-AGS: |
-Macromolecule #5: MAGNESIUM ION
Macromolecule | Name: MAGNESIUM ION / type: ligand / ID: 5 / Number of copies: 8 / Formula: MG |
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Molecular weight | Theoretical: 24.305 Da |
-Experimental details
-Structure determination
Method | cryo EM |
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Processing | helical reconstruction |
Aggregation state | filament |
-Sample preparation
Concentration | 0.2 mg/mL | ||||||||||||||||||
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Buffer | pH: 7.5 Component:
Details: 70 mM Tris, pH 7.5, 150 mM NaCl, 1 mM MgCl2, 2 mM TCEP, 0.25 mM ATPyS | ||||||||||||||||||
Grid | Model: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Support film - Film thickness: 10 / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec. / Pretreatment - Atmosphere: AIR / Pretreatment - Pressure: 0.03 kPa / Details: 25 mA current | ||||||||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK IV / Details: Blotting time of 7.0 s; 0.0 blot force. |
-Electron microscopy
Microscope | FEI TITAN KRIOS |
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Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
Electron optics | C2 aperture diameter: 100.0 µm / Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 64000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Details | Preliminary grid screening was done manually |
Image recording | Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 2748 / Average exposure time: 5.35 sec. / Average electron dose: 46.2 e/Å2 / Details: 40 frames collected per movie |
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
-Image processing
-Atomic model buiding 1
Initial model | Chain - Source name: AlphaFold / Chain - Initial model type: in silico model Details: The initial model was generated via benchling plugin for full-length construct sequence |
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Refinement | Space: REAL / Protocol: RIGID BODY FIT |
Output model | PDB-8trg: |