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- PDB-7k1b: CryoEM structure of DNA-PK catalytic subunit complexed with DNA (... -

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Basic information

Entry
Database: PDB / ID: 7k1b
TitleCryoEM structure of DNA-PK catalytic subunit complexed with DNA (Complex II)
Components
  • DNA (5'-D(P*AP*AP*GP*CP*AP*GP*TP*AP*GP*AP*GP*CP*AP*TP*GP*C)-3')
  • DNA (5'-D(P*GP*CP*AP*TP*GP*CP*TP*CP*TP*AP*CP*TP*GP*CP*TP*TP*CP*GP*AP*TP*AP*TP*CP*G)-3')
  • DNA-dependent protein kinase catalytic subunit
KeywordsDNA BINDING PROTEIN/DNA / NHEJ / V(D)J recombination / DNA repair / DNA BINDING PROTEIN / DNA BINDING PROTEIN-DNA complex
Function / homology
Function and homology information


MHC class II antigen presentation / Neutrophil degranulation / entry into host cell by a symbiont-containing vacuole / Hydrolases; Acting on peptide bonds (peptidases); Aspartic endopeptidases / protein autoprocessing / transport vesicle / protein processing / aspartic-type endopeptidase activity / proteolysis
Similarity search - Function
DNA-dependent protein kinase catalytic subunit, CC3 / DNA-PKcs, CC5 / Pepsin-like domain / FAT domain / FATC domain / Phosphatidylinositol 3- and 4-kinase / Eukaryotic aspartyl protease / Aspartic peptidase A1 family / Peptidase family A1 domain / Peptidase family A1 domain profile. ...DNA-dependent protein kinase catalytic subunit, CC3 / DNA-PKcs, CC5 / Pepsin-like domain / FAT domain / FATC domain / Phosphatidylinositol 3- and 4-kinase / Eukaryotic aspartyl protease / Aspartic peptidase A1 family / Peptidase family A1 domain / Peptidase family A1 domain profile. / Aspartic peptidase, active site / Eukaryotic and viral aspartyl proteases active site. / Aspartic peptidase domain superfamily
Similarity search - Domain/homology
DNA / DNA (> 10) / Plasmepsin X
Similarity search - Component
Biological speciesHomo sapiens (human)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.3 Å
AuthorsChen, X. / Gellert, M. / Yang, W.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK) United States
CitationJournal: Mol Cell / Year: 2021
Title: Structure of an activated DNA-PK and its implications for NHEJ.
Authors: Xuemin Chen / Xiang Xu / Yun Chen / Joyce C Cheung / Huaibin Wang / Jiansen Jiang / Natalia de Val / Tara Fox / Martin Gellert / Wei Yang /
Abstract: DNA-dependent protein kinase (DNA-PK), like all phosphatidylinositol 3-kinase-related kinases (PIKKs), is composed of conserved FAT and kinase domains (FATKINs) along with solenoid structures made of ...DNA-dependent protein kinase (DNA-PK), like all phosphatidylinositol 3-kinase-related kinases (PIKKs), is composed of conserved FAT and kinase domains (FATKINs) along with solenoid structures made of HEAT repeats. These kinases are activated in response to cellular stress signals, but the mechanisms governing activation and regulation remain unresolved. For DNA-PK, all existing structures represent inactive states with resolution limited to 4.3 Å at best. Here, we report the cryoelectron microscopy (cryo-EM) structures of DNA-PKcs (DNA-PK catalytic subunit) bound to a DNA end or complexed with Ku70/80 and DNA in both inactive and activated forms at resolutions of 3.7 Å overall and 3.2 Å for FATKINs. These structures reveal the sequential transition of DNA-PK from inactive to activated forms. Most notably, activation of the kinase involves previously unknown stretching and twisting within individual solenoid segments and loosens DNA-end binding. This unprecedented structural plasticity of helical repeats may be a general regulatory mechanism of HEAT-repeat proteins.
History
DepositionSep 7, 2020Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 6, 2021Provider: repository / Type: Initial release
Revision 1.1Jan 13, 2021Group: Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Mar 3, 2021Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.year
Revision 1.3Mar 6, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
A: DNA-dependent protein kinase catalytic subunit
D: DNA (5'-D(P*GP*CP*AP*TP*GP*CP*TP*CP*TP*AP*CP*TP*GP*CP*TP*TP*CP*GP*AP*TP*AP*TP*CP*G)-3')
F: DNA (5'-D(P*GP*CP*AP*TP*GP*CP*TP*CP*TP*AP*CP*TP*GP*CP*TP*TP*CP*GP*AP*TP*AP*TP*CP*G)-3')
G: DNA (5'-D(P*AP*AP*GP*CP*AP*GP*TP*AP*GP*AP*GP*CP*AP*TP*GP*C)-3')


Theoretical massNumber of molelcules
Total (without water)489,2534
Polymers489,2534
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein DNA-dependent protein kinase catalytic subunit / DNA-PKcs / DNPK1 / p460


Mass: 469673.219 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human)
References: UniProt: P78527, non-specific serine/threonine protein kinase
#2: DNA chain DNA (5'-D(P*GP*CP*AP*TP*GP*CP*TP*CP*TP*AP*CP*TP*GP*CP*TP*TP*CP*GP*AP*TP*AP*TP*CP*G)-3')


Mass: 7311.714 Da / Num. of mol.: 2 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)
#3: DNA chain DNA (5'-D(P*AP*AP*GP*CP*AP*GP*TP*AP*GP*AP*GP*CP*AP*TP*GP*C)-3')


Mass: 4956.243 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)

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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: complex II / Type: COMPLEX / Entity ID: all / Source: MULTIPLE SOURCES
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
11Homo sapiens (human)9606
21synthetic construct (others)32630
Buffer solutionpH: 7.9
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: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 45 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.14_3260: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 46407 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00530000
ELECTRON MICROSCOPYf_angle_d1.04840780
ELECTRON MICROSCOPYf_dihedral_angle_d18.00218084
ELECTRON MICROSCOPYf_chiral_restr0.0564684
ELECTRON MICROSCOPYf_plane_restr0.0095024

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