+Open data
-Basic information
Entry | Database: PDB / ID: 8tdv | ||||||
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Title | ssRNA bound SAMHD1 T closed | ||||||
Components |
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Keywords | HYDROLASE / Deoxynucleoside triphosphate triphosphohydrolase | ||||||
Function / homology | Function and homology information Nucleotide catabolism / Hydrolases; Acting on ester bonds; Triphosphoric-monoester hydrolases / deoxynucleoside triphosphate hydrolase activity / triphosphoric monoester hydrolase activity / dGTP binding / dATP catabolic process / dGTPase activity / tetraspanin-enriched microdomain / DNA strand resection involved in replication fork processing / deoxyribonucleotide catabolic process ...Nucleotide catabolism / Hydrolases; Acting on ester bonds; Triphosphoric-monoester hydrolases / deoxynucleoside triphosphate hydrolase activity / triphosphoric monoester hydrolase activity / dGTP binding / dATP catabolic process / dGTPase activity / tetraspanin-enriched microdomain / DNA strand resection involved in replication fork processing / deoxyribonucleotide catabolic process / dGTP catabolic process / negative regulation of type I interferon-mediated signaling pathway / regulation of innate immune response / somatic hypermutation of immunoglobulin genes / RNA nuclease activity / double-strand break repair via homologous recombination / Interferon alpha/beta signaling / site of double-strand break / single-stranded DNA binding / protein homotetramerization / defense response to virus / nucleic acid binding / immune response / innate immune response / DNA damage response / GTP binding / RNA binding / zinc ion binding / nucleoplasm / identical protein binding / nucleus / plasma membrane Similarity search - Function | ||||||
Biological species | Homo sapiens (human) Virus-associated RNAs | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.44 Å | ||||||
Authors | Sung, M. / Huynh, K. / Han, S. | ||||||
Funding support | 1items
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Citation | Journal: Nucleic Acids Res / Year: 2023 Title: Guanine-containing ssDNA and RNA induce dimeric and tetrameric structural forms of SAMHD1. Authors: Benjamin Orris / Min Woo Sung / Shridhar Bhat / Yingrong Xu / Kevin W Huynh / Seungil Han / Darren C Johnson / Benedikt Bosbach / David J Shields / James T Stivers / Abstract: The dNTPase activity of tetrameric SAM and HD domain containing deoxynucleoside triphosphate triphosphohydrolase 1 (SAMHD1) plays a critical role in cellular dNTP regulation. SAMHD1 also associates ...The dNTPase activity of tetrameric SAM and HD domain containing deoxynucleoside triphosphate triphosphohydrolase 1 (SAMHD1) plays a critical role in cellular dNTP regulation. SAMHD1 also associates with stalled DNA replication forks, DNA repair foci, ssRNA and telomeres. The above functions require nucleic acid binding by SAMHD1, which may be modulated by its oligomeric state. Here we establish in cryo-EM and biochemical studies that the guanine-specific A1 activator site of each SAMHD1 monomer is used to target the enzyme to guanine nucleotides within single-stranded (ss) DNA and RNA. Remarkably, nucleic acid strands containing a single guanine base induce dimeric SAMHD1, while two or more guanines with ∼20 nucleotide spacing induce a tetrameric form. A cryo-EM structure of ssRNA-bound tetrameric SAMHD1 shows how ssRNA strands bridge two SAMHD1 dimers and stabilize the structure. This ssRNA-bound tetramer is inactive with respect to dNTPase and RNase activity. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 8tdv.cif.gz | 309.5 KB | Display | PDBx/mmCIF format |
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PDB format | pdb8tdv.ent.gz | 225.8 KB | Display | PDB format |
PDBx/mmJSON format | 8tdv.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/td/8tdv ftp://data.pdbj.org/pub/pdb/validation_reports/td/8tdv | HTTPS FTP |
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-Related structure data
Related structure data | 41174MC 8tdwC M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
#1: Protein | Mass: 72305.414 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Homo sapiens (human) / Gene: SAMHD1, MOP5 / Production host: Escherichia coli (E. coli) References: UniProt: Q9Y3Z3, Hydrolases; Acting on ester bonds; Triphosphoric-monoester hydrolases #2: RNA chain | | Mass: 1866.181 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Virus-associated RNAs #3: RNA chain | | Mass: 2155.363 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Virus-associated RNAs #4: Chemical | Has ligand of interest | N | |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-Sample preparation
Component |
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Source (natural) | Organism: Homo sapiens (human) | ||||||||||||||||||||||||
Source (recombinant) | Organism: Escherichia coli (E. coli) | ||||||||||||||||||||||||
Buffer solution | pH: 7.5 | ||||||||||||||||||||||||
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||
Vitrification | Cryogen name: ETHANE |
-Electron microscopy imaging
Experimental equipment | Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2400 nm / Nominal defocus min: 600 nm / Cs: 2.7 mm |
Image recording | Electron dose: 40 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) |
-Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3D reconstruction | Resolution: 3.44 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 343857 / Symmetry type: POINT |