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- PDB-6xbz: Structure of the human CDK-activating kinase -

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Basic information

Entry
Database: PDB / ID: 6xbz
TitleStructure of the human CDK-activating kinase
Components
  • CDK-activating kinase assembly factor MAT1
  • Cyclin-H
  • Cyclin-dependent kinase 7
KeywordsTRANSFERASE / Kinase / transcription / cell cycle / complex
Function / homology
Function and homology information


ventricular system development / snRNA transcription by RNA polymerase II / CAK-ERCC2 complex / transcription factor TFIIK complex / adult heart development / transcription factor TFIIH holo complex / transcription factor TFIIH core complex / cyclin-dependent protein serine/threonine kinase activator activity / [RNA-polymerase]-subunit kinase / RNA Polymerase I Transcription Termination ...ventricular system development / snRNA transcription by RNA polymerase II / CAK-ERCC2 complex / transcription factor TFIIK complex / adult heart development / transcription factor TFIIH holo complex / transcription factor TFIIH core complex / cyclin-dependent protein serine/threonine kinase activator activity / [RNA-polymerase]-subunit kinase / RNA Polymerase I Transcription Termination / cyclin-dependent protein serine/threonine kinase regulator activity / RNA Pol II CTD phosphorylation and interaction with CE during HIV infection / RNA Pol II CTD phosphorylation and interaction with CE / Formation of the Early Elongation Complex / Formation of the HIV-1 Early Elongation Complex / mRNA Capping / HIV Transcription Initiation / RNA Polymerase II HIV Promoter Escape / Transcription of the HIV genome / RNA Polymerase II Promoter Escape / RNA Polymerase II Transcription Pre-Initiation And Promoter Opening / RNA Polymerase II Transcription Initiation / RNA Polymerase II Transcription Initiation And Promoter Clearance / regulation of G1/S transition of mitotic cell cycle / RNA Polymerase I Transcription Initiation / RNA polymerase II transcribes snRNA genes / Tat-mediated elongation of the HIV-1 transcript / Formation of HIV-1 elongation complex containing HIV-1 Tat / cyclin-dependent kinase / Formation of HIV elongation complex in the absence of HIV Tat / cyclin-dependent protein serine/threonine kinase activity / ATP-dependent activity, acting on DNA / Cyclin E associated events during G1/S transition / RNA Polymerase II Transcription Elongation / Cyclin A/B1/B2 associated events during G2/M transition / cyclin-dependent protein kinase holoenzyme complex / Formation of RNA Pol II elongation complex / Cyclin A:Cdk2-associated events at S phase entry / RNA Polymerase II Pre-transcription Events / RNA polymerase II CTD heptapeptide repeat kinase activity / male germ cell nucleus / TP53 Regulates Transcription of DNA Repair Genes / nucleotide-excision repair / transcription initiation at RNA polymerase II promoter / RNA Polymerase I Promoter Escape / positive regulation of smooth muscle cell proliferation / NoRC negatively regulates rRNA expression / Transcription-Coupled Nucleotide Excision Repair (TC-NER) / Formation of TC-NER Pre-Incision Complex / fibrillar center / Formation of Incision Complex in GG-NER / response to calcium ion / Dual incision in TC-NER / Gap-filling DNA repair synthesis and ligation in TC-NER / G1/S transition of mitotic cell cycle / Cyclin D associated events in G1 / RUNX1 regulates transcription of genes involved in differentiation of HSCs / transcription by RNA polymerase II / regulation of cell cycle / protein stabilization / protein kinase activity / cell division / protein serine kinase activity / DNA repair / protein serine/threonine kinase activity / negative regulation of apoptotic process / regulation of transcription by RNA polymerase II / perinuclear region of cytoplasm / positive regulation of transcription by RNA polymerase II / zinc ion binding / nucleoplasm / ATP binding / nucleus / plasma membrane / cytosol / cytoplasm
Similarity search - Function
CyclinH/Ccl1 / Cyclin-dependent kinase 7 / Cdk-activating kinase assembly factor MAT1/Tfb3 / Cdk-activating kinase assembly factor MAT1, centre / CDK-activating kinase assembly factor MAT1 / Zinc finger, C3HC4 type (RING finger) / Cyclin, C-terminal domain 2 / Cyclin C-terminal domain / Cyclin/Cyclin-like subunit Ssn8 / Ubiquitin interacting motif ...CyclinH/Ccl1 / Cyclin-dependent kinase 7 / Cdk-activating kinase assembly factor MAT1/Tfb3 / Cdk-activating kinase assembly factor MAT1, centre / CDK-activating kinase assembly factor MAT1 / Zinc finger, C3HC4 type (RING finger) / Cyclin, C-terminal domain 2 / Cyclin C-terminal domain / Cyclin/Cyclin-like subunit Ssn8 / Ubiquitin interacting motif / Ubiquitin-interacting motif (UIM) domain profile. / Cyclin, N-terminal / Cyclin, N-terminal domain / Cyclin-like / domain present in cyclins, TFIIB and Retinoblastoma / Cyclin-like superfamily / : / Zinc finger, RING-type, conserved site / Zinc finger RING-type signature. / Ring finger / Zinc finger RING-type profile. / Zinc finger, RING-type / Zinc finger, RING/FYVE/PHD-type / Serine/threonine-protein kinase, active site / Serine/Threonine protein kinases active-site signature. / Protein kinase domain / Serine/Threonine protein kinases, catalytic domain / Protein kinase, ATP binding site / Protein kinases ATP-binding region signature. / Protein kinase domain profile. / Protein kinase domain / Protein kinase-like domain superfamily
Similarity search - Domain/homology
PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER / Cyclin-dependent kinase 7 / Cyclin-H / CDK-activating kinase assembly factor MAT1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.8 Å
AuthorsGreber, B.J. / Perez-Bertoldi, J.M. / Lim, K. / Iavarone, A.T. / Toso, D.B. / Nogales, E.
Funding support United States, 4items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01-GM63072 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)P01-GM063210 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35-GM127018 United States
Howard Hughes Medical Institute (HHMI) United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2020
Title: The cryoelectron microscopy structure of the human CDK-activating kinase.
Authors: Basil J Greber / Juan M Perez-Bertoldi / Kif Lim / Anthony T Iavarone / Daniel B Toso / Eva Nogales /
Abstract: The human CDK-activating kinase (CAK), a complex composed of cyclin-dependent kinase (CDK) 7, cyclin H, and MAT1, is a critical regulator of transcription initiation and the cell cycle. It acts by ...The human CDK-activating kinase (CAK), a complex composed of cyclin-dependent kinase (CDK) 7, cyclin H, and MAT1, is a critical regulator of transcription initiation and the cell cycle. It acts by phosphorylating the C-terminal heptapeptide repeat domain of the RNA polymerase II (Pol II) subunit RPB1, which is an important regulatory event in transcription initiation by Pol II, and it phosphorylates the regulatory T-loop of CDKs that control cell cycle progression. Here, we have determined the three-dimensional (3D) structure of the catalytic module of human CAK, revealing the structural basis of its assembly and providing insight into CDK7 activation in this context. The unique third component of the complex, MAT1, substantially extends the interaction interface between CDK7 and cyclin H, explaining its role as a CAK assembly factor, and it forms interactions with the CDK7 T-loop, which may contribute to enhancing CAK activity. We have also determined the structure of the CAK in complex with the covalently bound inhibitor THZ1 in order to provide insight into the binding of inhibitors at the CDK7 active site and to aid in the rational design of therapeutic compounds.
History
DepositionJun 7, 2020Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 9, 2020Provider: repository / Type: Initial release
Revision 1.1Sep 30, 2020Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID
Revision 1.2Nov 6, 2024Group: Data collection / Database references ...Data collection / Database references / Refinement description / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / em_3d_fitting_list / em_admin / pdbx_entry_details / pdbx_initial_refinement_model / pdbx_modification_feature
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type / _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

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Assembly

Deposited unit
H: CDK-activating kinase assembly factor MAT1
I: Cyclin-H
J: Cyclin-dependent kinase 7
hetero molecules


Theoretical massNumber of molelcules
Total (without water)120,1065
Polymers119,5593
Non-polymers5482
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area7970 Å2
ΔGint-55 kcal/mol
Surface area27480 Å2

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Components

#1: Protein CDK-activating kinase assembly factor MAT1 / CDK7/cyclin-H assembly factor / Cyclin-G1-interacting protein / Menage a trois / RING finger ...CDK7/cyclin-H assembly factor / Cyclin-G1-interacting protein / Menage a trois / RING finger protein 66 / RING finger protein MAT1 / p35 / p36


Mass: 38132.340 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: MNAT1, CAP35, MAT1, RNF66 / Cell line (production host): High5 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: P51948
#2: Protein Cyclin-H / MO15-associated protein / p34 / p37


Mass: 37695.473 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CCNH / Cell line (production host): High5 / Production host: Trichoplusia ni (cabbage looper) / References: UniProt: P51946
#3: Protein Cyclin-dependent kinase 7 / 39 kDa protein kinase / p39 Mo15 / CDK-activating kinase 1 / Cell division protein kinase 7 / ...39 kDa protein kinase / p39 Mo15 / CDK-activating kinase 1 / Cell division protein kinase 7 / Serine/threonine-protein kinase 1 / TFIIH basal transcription factor complex kinase subunit


Mass: 43731.051 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CDK7, CAK, CAK1, CDKN7, MO15, STK1 / Cell line (production host): High5 / Production host: Trichoplusia ni (cabbage looper)
References: UniProt: P50613, cyclin-dependent kinase, [RNA-polymerase]-subunit kinase
#4: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg
#5: Chemical ChemComp-AGS / PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER / ATP-GAMMA-S / ADENOSINE 5'-(3-THIOTRIPHOSPHATE) / ADENOSINE 5'-(GAMMA-THIOTRIPHOSPHATE) / ADENOSINE-5'-DIPHOSPHATE MONOTHIOPHOSPHATE


Mass: 523.247 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H16N5O12P3S / Comment: ATP-gamma-S, energy-carrying molecule analogue*YM
Has ligand of interestN
Has protein modificationY

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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: Human CDK-activating kinase / Type: COMPLEX
Details: Recombinantly expressed as a trimeric complex in insect cells
Entity ID: #1-#3 / Source: RECOMBINANT
Molecular weightValue: 0.1 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Trichoplusia ni (cabbage looper)
Buffer solutionpH: 7.9
Buffer component
IDConc.NameFormulaBuffer-ID
1200 mMKCl1
25 mMMgCl21
320 mMHEPES-KOH1
45 mMbeta-mercaptoethanol1
52 mMATP-gamma-S1
SpecimenConc.: 0.2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid type: UltrAuFoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 278 K

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Calibrated magnification: 72886 X / Nominal defocus max: 2500 nm / Nominal defocus min: 300 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: ZEMLIN TABLEAU
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recording

Imaging-ID: 1 / Average exposure time: 2 sec. / Electron dose: 69 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Details: 69 frames per movie

IDNum. of real images
13296
24286

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Processing

SoftwareName: PHENIX / Version: 1.18.2_3874: / Classification: refinement
EM software
IDNameVersionCategory
1RELION3.1particle selection
2SerialEMimage acquisition
4RELION3.1CTF correction
5CTFFIND4CTF correction
8UCSF Chimeramodel fitting
9Cootmodel fitting
11RELION3.1initial Euler assignment
12RELION3.1final Euler assignment
13RELION3.1classification
14RELION3.13D reconstruction
15PHENIXmodel refinement
CTF correctionDetails: CTF estimation with CTFFIND4, CTF correction in RELION 3.1 during reconstruction.
Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 8982448 / Details: 3D-template picking
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 168906 / Algorithm: FOURIER SPACE / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingProtocol: OTHER / Space: REAL
Atomic model building
IDPDB-ID 3D fitting-IDAccession codeInitial refinement model-IDSource nameType
11UA2

1ua2

11UA21PDBexperimental model
21KXU

1kxu

11KXU2PDBexperimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0085341
ELECTRON MICROSCOPYf_angle_d0.8197238
ELECTRON MICROSCOPYf_dihedral_angle_d18.791714
ELECTRON MICROSCOPYf_chiral_restr0.049798
ELECTRON MICROSCOPYf_plane_restr0.005922

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