[English] 日本語
Yorodumi
- PDB-8qxo: Cryo-EM structure of tetrameric human SAMHD1 State V - Depleted r... -

+
Open data


ID or keywords:

Loading...

-
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 / dGTPase activity / deoxyribonucleotide catabolic process / tetraspanin-enriched microdomain / 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 / dGTPase activity / deoxyribonucleotide catabolic process / tetraspanin-enriched microdomain / 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 / somatic hypermutation of immunoglobulin genes / RNA nuclease activity / double-strand break repair via homologous recombination / Interferon alpha/beta signaling / single-stranded DNA binding / site of double-strand break / defense response to virus / protein homotetramerization / 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

-
Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

-
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

-
Components

-
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

-
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

-
Details

Has ligand of interestY

-
Experimental details

-
Experiment

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

-
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

-
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)

-
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

+
About Yorodumi

-
News

-
Feb 9, 2022. New format data for meta-information of EMDB entries

New format data for meta-information of EMDB entries

  • Version 3 of the EMDB header file is now the official format.
  • The previous official version 1.9 will be removed from the archive.

Related info.:EMDB header

External links:wwPDB to switch to version 3 of the EMDB data model

-
Aug 12, 2020. Covid-19 info

Covid-19 info

URL: https://pdbj.org/emnavi/covid19.php

New page: Covid-19 featured information page in EM Navigator.

Related info.:Covid-19 info / Mar 5, 2020. Novel coronavirus structure data

+
Mar 5, 2020. Novel coronavirus structure data

Novel coronavirus structure data

Related info.:Yorodumi Speices / Aug 12, 2020. Covid-19 info

External links:COVID-19 featured content - PDBj / Molecule of the Month (242)：Coronavirus Proteases

+
Jan 31, 2019. EMDB accession codes are about to change! (news from PDBe EMDB page)

EMDB accession codes are about to change! (news from PDBe EMDB page)

  • The allocation of 4 digits for EMDB accession codes will soon come to an end. Whilst these codes will remain in use, new EMDB accession codes will include an additional digit and will expand incrementally as the available range of codes is exhausted. The current 4-digit format prefixed with “EMD-” (i.e. EMD-XXXX) will advance to a 5-digit format (i.e. EMD-XXXXX), and so on. It is currently estimated that the 4-digit codes will be depleted around Spring 2019, at which point the 5-digit format will come into force.
  • The EM Navigator/Yorodumi systems omit the EMD- prefix.

Related info.:Q: What is EMD? / ID/Accession-code notation in Yorodumi/EM Navigator

External links:EMDB Accession Codes are Changing Soon! / Contact to PDBj

+
Jul 12, 2017. Major update of PDB

Major update of PDB

  • wwPDB released updated PDB data conforming to the new PDBx/mmCIF dictionary.
  • This is a major update changing the version number from 4 to 5, and with Remediation, in which all the entries are updated.
  • In this update, many items about electron microscopy experimental information are reorganized (e.g. em_software).
  • Now, EM Navigator and Yorodumi are based on the updated data.

External links:wwPDB Remediation / Enriched Model Files Conforming to OneDep Data Standards Now Available in the PDB FTP Archive

-
Yorodumi

Thousand views of thousand structures

  • Yorodumi is a browser for structure data from EMDB, PDB, SASBDB, etc.
  • This page is also the successor to EM Navigator detail page, and also detail information page/front-end page for Omokage search.
  • The word "yorodu" (or yorozu) is an old Japanese word meaning "ten thousand". "mi" (miru) is to see.

Related info.:EMDB / PDB / SASBDB / Comparison of 3 databanks / Yorodumi Search / Aug 31, 2016. New EM Navigator & Yorodumi / Yorodumi Papers / Jmol/JSmol / Function and homology information / Changes in new EM Navigator and Yorodumi

Read more