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- EMDB-53205: Cryo-EM structure of the human CAK bound to OTS964 -

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Basic information

Entry
Database: EMDB / ID: EMD-53205
TitleCryo-EM structure of the human CAK bound to OTS964
Map dataPost-processed (sharpened, filtered) cryo-EM map.
Sample
  • Complex: CAK-OTS964 complex
    • Protein or peptide: CDK-activating kinase assembly factor MAT1
    • Protein or peptide: Cyclin-H
    • Protein or peptide: Cyclin-dependent kinase 7
  • Ligand: OTS964
  • Ligand: water
Keywordskinase / cyclin-dependent kinase / inhibitor / CELL CYCLE
Function / homology
Function and homology information


RNA polymerase II CTD heptapeptide repeat S5 kinase activity / ventricular system development / snRNA transcription by RNA polymerase II / transcription factor TFIIK complex / CAK-ERCC2 complex / transcription factor TFIIH core complex / transcription factor TFIIH holo complex / cyclin-dependent protein serine/threonine kinase activator activity / adult heart development / [RNA-polymerase]-subunit kinase ...RNA polymerase II CTD heptapeptide repeat S5 kinase activity / ventricular system development / snRNA transcription by RNA polymerase II / transcription factor TFIIK complex / CAK-ERCC2 complex / transcription factor TFIIH core complex / transcription factor TFIIH holo complex / cyclin-dependent protein serine/threonine kinase activator activity / adult heart development / [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 / RNA Polymerase I Transcription Initiation / RNA polymerase II transcribes snRNA genes / regulation of G1/S transition of mitotic cell cycle / cyclin-dependent kinase / cyclin-dependent protein serine/threonine kinase activity / ATP-dependent activity, acting on DNA / Tat-mediated elongation of the HIV-1 transcript / Cyclin E associated events during G1/S transition / Formation of HIV-1 elongation complex containing HIV-1 Tat / Cyclin A:Cdk2-associated events at S phase entry / Formation of HIV elongation complex in the absence of HIV Tat / cyclin-dependent protein kinase holoenzyme complex / Cyclin A/B1/B2 associated events during G2/M transition / RNA Polymerase II Transcription Elongation / Formation of RNA Pol II elongation complex / RNA polymerase II CTD heptapeptide repeat kinase activity / RNA Polymerase II Pre-transcription Events / positive regulation of smooth muscle cell proliferation / 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 / G1/S transition of mitotic cell cycle / NoRC negatively regulates rRNA expression / response to calcium ion / Transcription-Coupled Nucleotide Excision Repair (TC-NER) / Formation of TC-NER Pre-Incision Complex / fibrillar center / Formation of Incision Complex in GG-NER / Dual incision in TC-NER / Cyclin D associated events in G1 / kinase activity / Gap-filling DNA repair synthesis and ligation in TC-NER / RUNX1 regulates transcription of genes involved in differentiation of HSCs / transcription by RNA polymerase II / protein kinase activity / regulation of cell cycle / protein stabilization / cell division / protein serine kinase activity / DNA repair / protein serine/threonine kinase activity / regulation of transcription by RNA polymerase II / negative regulation of apoptotic process / perinuclear region of cytoplasm / positive regulation of transcription by RNA polymerase II / zinc ion binding / nucleoplasm / ATP binding / nucleus / plasma membrane / cytoplasm / cytosol
Similarity search - Function
: / MAT1 C-terminal CAK anchor / 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 ...: / MAT1 C-terminal CAK anchor / 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 / Cyclin, N-terminal / Cyclin, N-terminal domain / Ubiquitin interacting motif / Ubiquitin-interacting motif (UIM) domain profile. / 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
Cyclin-dependent kinase 7 / Cyclin-H / CDK-activating kinase assembly factor MAT1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.4 Å
AuthorsMcGeoch AJS / Cushing VI / Cronin NB / Alfieri C / Greber BJ
Funding support United Kingdom, 1 items
OrganizationGrant numberCountry
Medical Research Council (MRC, United Kingdom)MR/V009354/1 United Kingdom
CitationJournal: Nat Commun / Year: 2026
Title: Cryo-EM structures of the CDK11-cyclin L-SAP30BP complex reveal mechanisms of CDK11 regulation.
Authors: Amy J S McGeoch / Victoria I Cushing / Theodoros I Roumeliotis / Nora B Cronin / Stephen J Hearnshaw / Jyoti S Choudhary / Claudio Alfieri / Basil J Greber /
Abstract: The cyclin-dependent kinase CDK11 functions in transcription, mitotic progression, and mRNA splicing. Specifically, spliceosome activation during the B to B transition depends on phosphorylation of ...The cyclin-dependent kinase CDK11 functions in transcription, mitotic progression, and mRNA splicing. Specifically, spliceosome activation during the B to B transition depends on phosphorylation of the U2 snRNP component SF3B1 by the CDK11-cyclin L-SAP30BP complex. Here, we present the structure of this spliceosome-activating CDK-cyclin complex, determined by cryogenic electron microscopy at 2.3 Å resolution. Our structure and biochemical experiments show that SAP30BP forms extensive interactions with cyclin L2, thereby stabilising it, and forms critical interactions with the C-terminal kinase lobe of CDK11 that promote complex assembly. Destabilisation of cyclin L2 in the absence of SAP30BP suggests that these principles are applicable to all CDK11-cyclin L complexes. Furthermore, we identify a pseudo-substrate sequence near the CDK11 C-terminus and provide evidence for a role of this segment in CDK11 auto-regulation. Finally, the structure of the CDK11-cyclin L-SAP30BP complex bound to the clinical high-affinity CDK11 inhibitor OTS964 and a comparison to OTS964-bound off-target complexes provide insight into the mechanism of OTS964 selectivity and specificity.
History
DepositionMar 19, 2025-
Header (metadata) releaseMar 18, 2026-
Map releaseMar 18, 2026-
UpdateMay 6, 2026-
Current statusMay 6, 2026Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_53205.png

Downloads & links

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Map

FileDownload / File: emd_53205.map.gz / Format: CCP4 / Size: 27 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationPost-processed (sharpened, filtered) cryo-EM map.
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.02 Å/pix.
x 192 pix.
= 195.84 Å		1.02 Å/pix.
x 192 pix.
= 195.84 Å		1.02 Å/pix.
x 192 pix.
= 195.84 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.02 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.01
Minimum - Maximum-0.03902568 - 0.07709768
Average (Standard dev.)0.0000178204 (±0.0021313415)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions192192192
Spacing192192192
CellA=B=C: 195.84 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_53205_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Unfiltered cryo-EM half map.

Fileemd_53205_half_map_1.map
AnnotationUnfiltered cryo-EM half map.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Unfiltered cryo-EM half map.

Fileemd_53205_half_map_2.map
AnnotationUnfiltered cryo-EM half map.
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : CAK-OTS964 complex

EntireName: CAK-OTS964 complex
Components
  • Complex: CAK-OTS964 complex
    • Protein or peptide: CDK-activating kinase assembly factor MAT1
    • Protein or peptide: Cyclin-H
    • Protein or peptide: Cyclin-dependent kinase 7
  • Ligand: OTS964
  • Ligand: water

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Supramolecule #1: CAK-OTS964 complex

SupramoleculeName: CAK-OTS964 complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 80 KDa

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Macromolecule #1: CDK-activating kinase assembly factor MAT1

MacromoleculeName: CDK-activating kinase assembly factor MAT1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 10.234531 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString:
SNAPVTFSTG IKMGQHISLA PIHKLEEALY EYQPLQIETY GPHVPELEML GRLGYLNHVR AASPQDLAGG YTSSLACHRA LQDAFSGLF WQPS

UniProtKB: CDK-activating kinase assembly factor MAT1

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Macromolecule #2: Cyclin-H

MacromoleculeName: Cyclin-H / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 37.721508 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: (ACE)MYHNSSQKR HWTFSSEEQL ARLRADANRK FRCKAVANGK VLPNDPVFLE PHEEMTLCKY YEKRLLEFCS VFKPAM PRS VVGTACMYFK RFYLNNSVME YHPRIIMLTC AFLACKVDEF NVSSPQFVGN LRESPLGQEK ALEQILEYEL LLIQQLN FH LIVHNPYRPF ...String:
(ACE)MYHNSSQKR HWTFSSEEQL ARLRADANRK FRCKAVANGK VLPNDPVFLE PHEEMTLCKY YEKRLLEFCS VFKPAM PRS VVGTACMYFK RFYLNNSVME YHPRIIMLTC AFLACKVDEF NVSSPQFVGN LRESPLGQEK ALEQILEYEL LLIQQLN FH LIVHNPYRPF EGFLIDLKTR YPILENPEIL RKTADDFLNR IALTDAYLLY TPSQIALTAI LSSASRAGIT MESYLSES L MLKENRTCLS QLLDIMKSMR NLVKKYEPPR SEEVAVLKQK LERCHSAELA LNVITKKRKG YEDDDYVSKK SKHEEEEWT DDDLVESL

UniProtKB: Cyclin-H

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Macromolecule #3: Cyclin-dependent kinase 7

MacromoleculeName: Cyclin-dependent kinase 7 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO / EC number: cyclin-dependent kinase
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 39.362598 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: SNAMALDVKS RAKRYEKLDF LGEGQFATVY KARDKNTNQI VAIKKIKLGH RSEAKDGINR TALREIKLLQ ELSHPNIIGL LDAFGHKSN ISLVFDFMET DLEVIIKDNS LVLTPSHIKA YMLMTLQGLE YLHQHWILHR DLKPNNLLLD ENGVLKLADF G LAKSFGSP ...String:
SNAMALDVKS RAKRYEKLDF LGEGQFATVY KARDKNTNQI VAIKKIKLGH RSEAKDGINR TALREIKLLQ ELSHPNIIGL LDAFGHKSN ISLVFDFMET DLEVIIKDNS LVLTPSHIKA YMLMTLQGLE YLHQHWILHR DLKPNNLLLD ENGVLKLADF G LAKSFGSP NRAYTHQVVT RWYRAPELLF GARMYGVGVD MWAVGCILAE LLLRVPFLPG DSDLDQLTRI FETLGTPTEE QW PDMCSLP DYVTFKSFPG IPLHHIFSAA GDDLLDLIQG LFLFNPCARI TATQALKMKY FSNRPGPTPG CQLPRPNCPV ETL KEQSNP ALAIKRKRTE ALEQGGLPKK LIF

UniProtKB: Cyclin-dependent kinase 7

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Macromolecule #4: OTS964

MacromoleculeName: OTS964 / type: ligand / ID: 4 / Number of copies: 1 / Formula: NK3
Molecular weightTheoretical: 392.514 Da
Chemical component information

ChemComp-NK3:
OTS964

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Macromolecule #5: water

MacromoleculeName: water / type: ligand / ID: 5 / Number of copies: 142 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.2 mg/mL
BufferpH: 7.9
Component:
ConcentrationNameFormula
40.0 mMHEPES-KOH
200.0 mMPotassium chlorideKCl
2.0 mMMagnesium chlorideMgCl2
5.0 mMbeta-mercaptoethanol
0.05 mMOTS964
GridModel: UltrAuFoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: GOLD / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 278 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number real images: 10788 / Average electron dose: 70.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.8 µm / Nominal defocus min: 0.6 µm / Nominal magnification: 165000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware: (Name: cryoSPARC (ver. 4.4.1), RELION (ver. 5.0-beta))
Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: EMDB MAP
EMDB ID:

12042

Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 2.4 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 5.0-beta) / Number images used: 340642
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 5.0-beta)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 5.0-beta)
Final 3D classificationNumber classes: 4 / Software - Name: RELION (ver. 5.0-beta)

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Atomic model buiding 1

Initial modelPDB ID:

8p6v


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: RIGID BODY FIT
Output model

PDB-9qjn:
Cryo-EM structure of the human CAK bound to OTS964

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