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- EMDB-22990: Structure of the H-lobe of yeast CKM -

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Basic information

Entry
Database: EMDB / ID: EMD-22990
TitleStructure of the H-lobe of yeast CKM
Map dataStructure of the H-lobe of yeast CKM
Sample
  • Complex: yeast CDK8 complexCyclin-dependent kinase 8
    • Protein or peptide: Mediator of RNA polymerase II transcription subunit 12
KeywordsMediator / Transcription / Cdk8 / Med13 / Med12 / CycC / CDK / Argonaute / RNA Polymerase II / PIWI
Function / homology
Function and homology information


positive regulation of transcription by galactose / CKM complex / mediator complex / transcription coactivator activity / negative regulation of transcription by RNA polymerase II / positive regulation of transcription by RNA polymerase II
Similarity search - Function
Mediator complex, subunit Med12 / Transcription mediator complex subunit Med12 / Transcription mediator complex subunit Med12
Similarity search - Domain/homology
Mediator of RNA polymerase II transcription subunit 12
Similarity search - Component
Biological speciesSaccharomyces cerevisiae S288C (yeast) / Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.9 Å
AuthorsLi YC / Chao TC
CitationJournal: Sci Adv / Year: 2021
Title: Structure and noncanonical Cdk8 activation mechanism within an Argonaute-containing Mediator kinase module.
Authors: Yi-Chuan Li / Ti-Chun Chao / Hee Jong Kim / Timothy Cholko / Shin-Fu Chen / Guojie Li / Laura Snyder / Kotaro Nakanishi / Chia-En Chang / Kenji Murakami / Benjamin A Garcia / Thomas G Boyer / Kuang-Lei Tsai /
Abstract: The Cdk8 kinase module (CKM) in Mediator, comprising Med13, Med12, CycC, and Cdk8, regulates RNA polymerase II transcription through kinase-dependent and -independent functions. Numerous pathogenic ...The Cdk8 kinase module (CKM) in Mediator, comprising Med13, Med12, CycC, and Cdk8, regulates RNA polymerase II transcription through kinase-dependent and -independent functions. Numerous pathogenic mutations causative for neurodevelopmental disorders and cancer congregate in CKM subunits. However, the structure of the intact CKM and the mechanism by which Cdk8 is non-canonically activated and functionally affected by oncogenic CKM alterations are poorly understood. Here, we report a cryo-electron microscopy structure of CKM that redefines prior CKM structural models and explains the mechanism of Med12-dependent Cdk8 activation. Med12 interacts extensively with CycC and activates Cdk8 by stabilizing its activation (T-)loop through conserved Med12 residues recurrently mutated in human tumors. Unexpectedly, Med13 has a characteristic Argonaute-like bi-lobal architecture. These findings not only provide a structural basis for understanding CKM function and pathological dysfunction, but also further impute a previously unknown regulatory mechanism of Mediator in transcriptional modulation through its Med13 Argonaute-like features.
History
DepositionNov 12, 2020-
Header (metadata) releaseJan 27, 2021-
Map releaseJan 27, 2021-
UpdateMar 6, 2024-
Current statusMar 6, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.017
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.017
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7kpw
  • Surface level: 0.017
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_22990.png

Downloads & links

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Map

FileDownload / File: emd_22990.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationStructure of the H-lobe of yeast CKM
Voxel sizeX=Y=Z: 1.07 Å
Density
Contour LevelBy AUTHOR: 0.017 / Movie #1: 0.017
Minimum - Maximum-0.037022132 - 0.07529268
Average (Standard dev.)0.00003197633 (±0.0009365085)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions384384384
Spacing384384384
CellA=B=C: 410.88 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.071.071.07
M x/y/z384384384
origin x/y/z0.0000.0000.000
length x/y/z410.880410.880410.880
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ300300300
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS384384384
D min/max/mean-0.0370.0750.000

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Supplemental data

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Half map: half-volume 1

Fileemd_22990_half_map_1.map
Annotationhalf-volume 1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half-volume 2

Fileemd_22990_half_map_2.map
Annotationhalf-volume 2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : yeast CDK8 complex

EntireName: yeast CDK8 complexCyclin-dependent kinase 8
Components
  • Complex: yeast CDK8 complexCyclin-dependent kinase 8
    • Protein or peptide: Mediator of RNA polymerase II transcription subunit 12

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Supramolecule #1: yeast CDK8 complex

SupramoleculeName: yeast CDK8 complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast)
Molecular weightTheoretical: 430 KDa

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Macromolecule #1: Mediator of RNA polymerase II transcription subunit 12

MacromoleculeName: Mediator of RNA polymerase II transcription subunit 12
type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)
Strain: ATCC 204508 / S288c
Molecular weightTheoretical: 167.049812 KDa
Recombinant expressionOrganism: Saccharomyces cerevisiae S288C (yeast)
SequenceString: MNNGSGRYLL TPPDDLHPYV PSSKPQEQVY PDFKPWEHTA AEDQILANFV AKGFYHTPMV NFESISARSS VHESLVTQSN ILSQQFDKI IKIREDHINK IPSNSTTTLH GPGFQLPNRI TLTDHRKETW LHELSSSHTS LVKIGKFIPH GLKRRQVIEQ C YLKFIPLK ...String:
MNNGSGRYLL TPPDDLHPYV PSSKPQEQVY PDFKPWEHTA AEDQILANFV AKGFYHTPMV NFESISARSS VHESLVTQSN ILSQQFDKI IKIREDHINK IPSNSTTTLH GPGFQLPNRI TLTDHRKETW LHELSSSHTS LVKIGKFIPH GLKRRQVIEQ C YLKFIPLK RAIWLIKCCY FIEWKSNHKK KRSNAAGADD AISMHLLKDW TDTFVYILEK LIFDMTNHYN DSQQLRTWKR QI SYFLKLL GNCYSLRLIN KEIFHHWLVE FINKMENFEF LPLSLHILMI FWNDICQIDT NAPVAATITS SQKEPFFLVT KIT DMLLHK YYIVSSSKSM INDENYIIND IKKNNKIKLN ILKILSSLIL KIFQEQSLEV FIFPTSNWEI YKPLLFEIVS NADT NQNSD MKKKLELISY RNESLKNNSS IRNVIMSASN ANDFQLTIVT CKQFPKLSCI QLNCIDTQFT KLLDDNPTEF DWPTY VDQN PLTMHKIIQL ILWSIHPSRQ FDHYESNQLV AKLLLLRINS TDEDLHEFQI EDAIWSLVFQ LAKNFSAQKR VVSYMM PSL YRLLNILITY GIIKVPTYIR KLISSGLLYL QDSNDKFVHV QLLINLKISP LMKSQYNMVL RNVMEYDVKF YEIFNFD QL VEITEQIKMR ILSNDITNLQ LSKTPLSIKI MVAEWYLSHL CSGILSSVNR TVLLKIFKIF CIDLEVFHHF FKWIEFIV Y HQLLSDIESL EALMDILLCY QKLFSQFIND HILFTKTFIF IYKKVLKEKD VPAYNVTSFM PFWKFFMKNF PFVLKVDND LRIELQSVYN DEKLKTEKLK NDKSEVLKVY SMINNSNQAV GQTWNFPEVF QVNIRFLLHN SEIIDTNTSK QFQKARNNVM LLIATNLKE YNKFMSIFLK RKDFTNKNLI QLISLKLLTF EVTQNVLGLE YIIRLLPINL ENNDGSYGLF LKYHKEQFIK S NFEKILLT CYELEKKYHG NECEINYYEI LLKILITYGS SPKLLATSTK IIMLLLNDSV ENSSNILEDI LYYSTCPSET DL NDIPLGS GQPDNDTVVT NDDKSDDDDH TVDEIDHVEY YVMMDFANLW VFQAFTCFCI KKIMENNEPA MAMEDLKNFI FQI IEITNS NDLCSQIFDQ LKDMQTIEMI TQIVEKDFCT SCLQNNNQKI DDNYIVVVIE IITSLSMRFQ RETSGMIVIS MENY HLLIK IIRQLSELNE GNLSKREIQI DAVLKIFSFH QDSIFQRIIA DLSADKPTSP FIDSICKLFD KISFNLRLKL FLYEI LSSL KSFAIYSSTI DAPAFHTSGK VELPKKLLNL PPFQVSSFVK ETKLHSGDYG EEEDADQEES FSLNLGIGIV EIAHEN EQK WLIYDKKDHK YVCTFSMEPY HFISNYNTKY TDDMATGSND TTAFNDSCVN LSLFDARFER KNPH

UniProtKB: Mediator of RNA polymerase II transcription subunit 12

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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

Concentration1 mg/mL
BufferpH: 7.4 / Details: 25 mM Hepes pH 7.4, 200 mM NaCl, and 0.005% NP-40
GridPretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. / Details: unspecified
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Instrument: FEI VITROBOT MARK III

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Electron microscopy

MicroscopeTFS KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 70.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm
Sample stageCooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K2 QUANTUM (4k x 4k) / Detector mode: COUNTING / Number real images: 15075 / Average electron dose: 65.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 815542
Startup modelType of model: NONE
Initial angle assignmentType: OTHER
Final angle assignmentType: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.9 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 36691
FSC plot (resolution estimation)

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