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- PDB-8qxo: Cryo-EM structure of tetrameric human SAMHD1 State V - Depleted r... -

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Basic information

Entry
Database: PDB / ID: 8qxo
TitleCryo-EM structure of tetrameric human SAMHD1 State V - Depleted relaxed
ComponentsDeoxynucleoside triphosphate triphosphohydrolase SAMHD1
KeywordsHYDROLASE / TRIPHOSPHOHYDROLASE / METALLO-ENZYME / BINUCLEAR / HD
Function / homology
Function and homology information


Nucleotide catabolism / Hydrolases; Acting on ester bonds; Triphosphoric-monoester hydrolases / deoxynucleoside triphosphate hydrolase activity / dGTP binding / dATP catabolic process / deoxyribonucleotide catabolic process / tetraspanin-enriched microdomain / dGTPase activity / dGTP catabolic process / DNA strand resection involved in replication fork processing ...Nucleotide catabolism / Hydrolases; Acting on ester bonds; Triphosphoric-monoester hydrolases / deoxynucleoside triphosphate hydrolase activity / dGTP binding / dATP catabolic process / deoxyribonucleotide catabolic process / tetraspanin-enriched microdomain / dGTPase activity / dGTP catabolic process / DNA strand resection involved in replication fork processing / negative regulation of type I interferon-mediated signaling pathway / regulation of innate immune response / RNA nuclease activity / somatic hypermutation of immunoglobulin genes / double-strand break repair via homologous recombination / Interferon alpha/beta signaling / single-stranded DNA binding / site of double-strand break / 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
: / HD domain profile. / HD domain / HD domain / SAM domain (Sterile alpha motif) / SAM domain profile. / Metal dependent phosphohydrolases with conserved 'HD' motif. / Sterile alpha motif. / HD/PDEase domain / Sterile alpha motif domain / Sterile alpha motif/pointed domain superfamily
Similarity search - Domain/homology
2'-DEOXYCYTIDINE-5'-TRIPHOSPHATE / 2'-DEOXYADENOSINE 5'-TRIPHOSPHATE / : / GUANOSINE-5'-TRIPHOSPHATE / Deoxynucleoside triphosphate triphosphohydrolase SAMHD1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.43 Å
AuthorsActon, O.J. / Sheppard, D. / Rosenthal, P.B. / Taylor, I.A.
Funding support United Kingdom, 3items
OrganizationGrant numberCountry
Cancer Research UKCC2029.CC2106 United Kingdom
Medical Research Council (MRC, United Kingdom)CC2029.CC2106 United Kingdom
Wellcome TrustCC2029.CC2106 United Kingdom
CitationJournal: Nat Commun / Year: 2024
Title: Platform-directed allostery and quaternary structure dynamics of SAMHD1 catalysis.
Authors: Oliver J Acton / Devon Sheppard / Simone Kunzelmann / Sarah J Caswell / Andrea Nans / Ailidh J O Burgess / Geoff Kelly / Elizabeth R Morris / Peter B Rosenthal / Ian A Taylor /
Abstract: SAMHD1 regulates cellular nucleotide homeostasis, controlling dNTP levels by catalysing their hydrolysis into 2'-deoxynucleosides and triphosphate. In differentiated CD4+ macrophage and resting T- ...SAMHD1 regulates cellular nucleotide homeostasis, controlling dNTP levels by catalysing their hydrolysis into 2'-deoxynucleosides and triphosphate. In differentiated CD4+ macrophage and resting T-cells SAMHD1 activity results in the inhibition of HIV-1 infection through a dNTP blockade. In cancer, SAMHD1 desensitizes cells to nucleoside-analogue chemotherapies. Here we employ time-resolved cryogenic-EM imaging and single-particle analysis to visualise assembly, allostery and catalysis by this multi-subunit enzyme. Our observations reveal how dynamic conformational changes in the SAMHD1 quaternary structure drive the catalytic cycle. We capture five states at high-resolution in a live catalytic reaction, revealing how allosteric activators support assembly of a stable SAMHD1 tetrameric core and how catalysis is driven by the opening and closing of active sites through pairwise coupling of active sites and order-disorder transitions in regulatory domains. This direct visualisation of enzyme catalysis dynamics within an allostery-stabilised platform sets a precedent for mechanistic studies into the regulation of multi-subunit enzymes.
History
DepositionOct 24, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0May 15, 2024Provider: repository / Type: Initial release
Revision 1.1May 22, 2024Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _citation_author.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Deoxynucleoside triphosphate triphosphohydrolase SAMHD1
B: Deoxynucleoside triphosphate triphosphohydrolase SAMHD1
C: Deoxynucleoside triphosphate triphosphohydrolase SAMHD1
D: Deoxynucleoside triphosphate triphosphohydrolase SAMHD1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)293,50318
Polymers289,2224
Non-polymers4,28114
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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Protein , 1 types, 4 molecules ABCD

#1: Protein
Deoxynucleoside triphosphate triphosphohydrolase SAMHD1


Mass: 72305.414 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SAMHD1 / Production host: Escherichia coli (E. coli) / References: UniProt: Q9Y3Z3

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Non-polymers , 5 types, 14 molecules

#2: Chemical
ChemComp-GTP / GUANOSINE-5'-TRIPHOSPHATE


Mass: 523.180 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C10H16N5O14P3 / Comment: GTP, energy-carrying molecule*YM
#3: Chemical
ChemComp-FE / FE (III) ION


Mass: 55.845 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Fe
#4: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Mg
#5: Chemical ChemComp-DTP / 2'-DEOXYADENOSINE 5'-TRIPHOSPHATE


Mass: 491.182 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C10H16N5O12P3
#6: Chemical ChemComp-DCP / 2'-DEOXYCYTIDINE-5'-TRIPHOSPHATE


Mass: 467.157 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C9H16N3O13P3 / Feature type: SUBJECT OF INVESTIGATION

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Details

Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: homotetramer of SAMHD1 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: LAB6 / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal magnification: 75000 X / Nominal defocus max: 3500 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 33 e/Å2 / Film or detector model: FEI FALCON III (4k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.19.2_4158: / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.43 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 26844 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00214627
ELECTRON MICROSCOPYf_angle_d0.53519832
ELECTRON MICROSCOPYf_dihedral_angle_d10.5982013
ELECTRON MICROSCOPYf_chiral_restr0.0432121
ELECTRON MICROSCOPYf_plane_restr0.0032525

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