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- PDB-8bya: Cryo-EM structure of SKP1-SKP2-CKS1-CDK2-CyclinA-p27KIP1 Complex -

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Basic information

Entry
Database: PDB / ID: 8bya
TitleCryo-EM structure of SKP1-SKP2-CKS1-CDK2-CyclinA-p27KIP1 Complex
Components
  • (Cyclin-dependent kinase ...) x 2
  • (S-phase kinase-associated protein ...) x 2
  • Cyclin-A2
  • Cyclin-dependent kinases regulatory subunit 1
  • p27 KIP1 C-terminus
KeywordsCELL CYCLE / cyclin-dependent kinase / signalling / ubiquitination
Function / homology
Function and homology information


positive regulation of protein polyubiquitination / F-box domain binding / cellular response to cell-matrix adhesion / : / cyclin A2-CDK1 complex / Aberrant regulation of mitotic exit in cancer due to RB1 defects / PcG protein complex / cell cycle G1/S phase transition / cellular response to luteinizing hormone stimulus / positive regulation of ubiquitin protein ligase activity ...positive regulation of protein polyubiquitination / F-box domain binding / cellular response to cell-matrix adhesion / : / cyclin A2-CDK1 complex / Aberrant regulation of mitotic exit in cancer due to RB1 defects / PcG protein complex / cell cycle G1/S phase transition / cellular response to luteinizing hormone stimulus / positive regulation of ubiquitin protein ligase activity / cyclin-dependent protein serine/threonine kinase inhibitor activity / Cul7-RING ubiquitin ligase complex / Transcription of E2F targets under negative control by p107 (RBL1) and p130 (RBL2) in complex with HDAC1 / cellular response to leptin stimulus / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling / maintenance of protein location in nucleus / male pronucleus / cyclin-dependent protein serine/threonine kinase activator activity / female pronucleus / cellular response to cocaine / response to glucagon / positive regulation of DNA biosynthetic process / cyclin-dependent protein serine/threonine kinase regulator activity / SCF ubiquitin ligase complex / SCF-dependent proteasomal ubiquitin-dependent protein catabolic process / positive regulation of intracellular estrogen receptor signaling pathway / cellular response to insulin-like growth factor stimulus / cyclin A1-CDK2 complex / cyclin E2-CDK2 complex / cyclin E1-CDK2 complex / cyclin A2-CDK2 complex / positive regulation of DNA-templated DNA replication initiation / G2 Phase / Y chromosome / cyclin-dependent protein kinase activity / Prolactin receptor signaling / Phosphorylation of proteins involved in G1/S transition by active Cyclin E:Cdk2 complexes / ubiquitin ligase complex scaffold activity / positive regulation of heterochromatin formation / p53-Dependent G1 DNA Damage Response / X chromosome / PTK6 Regulates Cell Cycle / regulation of anaphase-promoting complex-dependent catabolic process / Defective binding of RB1 mutants to E2F1,(E2F2, E2F3) / centriole replication / Regulation of APC/C activators between G1/S and early anaphase / regulation of DNA replication / telomere maintenance in response to DNA damage / microtubule organizing center / centrosome duplication / cullin family protein binding / G0 and Early G1 / cochlea development / Telomere Extension By Telomerase / protein K63-linked ubiquitination / animal organ regeneration / Activation of the pre-replicative complex / protein monoubiquitination / cyclin-dependent kinase / cyclin-dependent protein serine/threonine kinase activity / TP53 Regulates Transcription of Genes Involved in G1 Cell Cycle Arrest / Cajal body / ubiquitin-like ligase-substrate adaptor activity / Regulation of MITF-M-dependent genes involved in cell cycle and proliferation / Activation of ATR in response to replication stress / protein K48-linked ubiquitination / Cyclin E associated events during G1/S transition / Cyclin A/B1/B2 associated events during G2/M transition / positive regulation of double-strand break repair via homologous recombination / Cyclin A:Cdk2-associated events at S phase entry / Nuclear events stimulated by ALK signaling in cancer / cyclin-dependent protein kinase holoenzyme complex / condensed chromosome / regulation of G2/M transition of mitotic cell cycle / cellular response to platelet-derived growth factor stimulus / mitotic G1 DNA damage checkpoint signaling / positive regulation of smooth muscle cell proliferation / cellular response to nitric oxide / post-translational protein modification / cyclin binding / regulation of mitotic cell cycle / Regulation of BACH1 activity / molecular function activator activity / MAP3K8 (TPL2)-dependent MAPK1/3 activation / positive regulation of DNA replication / ubiquitin binding / meiotic cell cycle / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / male germ cell nucleus / Vpu mediated degradation of CD4 / Dectin-1 mediated noncanonical NF-kB signaling / Cdc20:Phospho-APC/C mediated degradation of Cyclin A / cellular response to estradiol stimulus / Activation of NF-kappaB in B cells / Degradation of GLI1 by the proteasome / Iron uptake and transport / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / Negative regulation of NOTCH4 signaling / G1/S transition of mitotic cell cycle
Similarity search - Function
Cyclin-dependent kinase inhibitor domain / Cyclin-dependent kinase inhibitor domain superfamily / Cyclin-dependent kinase inhibitor / Cyclin-dependent kinase, regulatory subunit / Cyclin-dependent kinase, regulatory subunit superfamily / Cyclin-dependent kinase regulatory subunit / Cyclin-dependent kinases regulatory subunits signature 1. / Cyclin-dependent kinases regulatory subunits signature 2. / Cyclin-dependent kinase regulatory subunit / A Receptor for Ubiquitination Targets ...Cyclin-dependent kinase inhibitor domain / Cyclin-dependent kinase inhibitor domain superfamily / Cyclin-dependent kinase inhibitor / Cyclin-dependent kinase, regulatory subunit / Cyclin-dependent kinase, regulatory subunit superfamily / Cyclin-dependent kinase regulatory subunit / Cyclin-dependent kinases regulatory subunits signature 1. / Cyclin-dependent kinases regulatory subunits signature 2. / Cyclin-dependent kinase regulatory subunit / A Receptor for Ubiquitination Targets / Leucine-rich repeat, cysteine-containing subtype / Leucine-rich repeat - CC (cysteine-containing) subfamily / F-box domain profile. / F-box-like / F-box-like domain superfamily / SKP1 component, dimerisation / S-phase kinase-associated protein 1 / SKP1-like, dimerisation domain superfamily / Skp1 family, dimerisation domain / Cyclin-A, N-terminal APC/C binding region / Cyclin-A N-terminal APC/C binding region / F-box domain / : / Cyclin, C-terminal domain / : / Cyclins signature. / Cyclin / Cyclin, C-terminal domain / Cyclin_C / S-phase kinase-associated protein 1-like / SKP1 component, POZ domain / Skp1 family, tetramerisation domain / Found in Skp1 protein family / Cyclin, N-terminal / Cyclin, N-terminal domain / Cyclin-like / domain present in cyclins, TFIIB and Retinoblastoma / Cyclin-like superfamily / : / SKP1/BTB/POZ domain superfamily / Leucine-rich repeat domain superfamily / 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 inhibitor 1B / Cyclin-A2 / Cyclin-dependent kinase 2 / Cyclin-dependent kinases regulatory subunit 1 / S-phase kinase-associated protein 1 / S-phase kinase-associated protein 2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.38 Å
AuthorsRowland, R.J. / Salamina, M. / Endicott, J.A. / Noble, M.E.
Funding support United Kingdom, 1items
OrganizationGrant numberCountry
Medical Research Council (MRC, United Kingdom)MR/N009738/1 and MR/V029142/1 United Kingdom
CitationJournal: Sci Rep / Year: 2023
Title: Cryo-EM structure of SKP1-SKP2-CKS1 in complex with CDK2-cyclin A-p27KIP1.
Authors: Rhianna J Rowland / Richard Heath / Daniel Maskell / Rebecca F Thompson / Neil A Ranson / James N Blaza / Jane A Endicott / Martin E M Noble / Marco Salamina /
Abstract: p27KIP1 (cyclin-dependent kinase inhibitor 1B, p27) is a member of the CIP/KIP family of CDK (cyclin dependent kinase) regulators that inhibit cell cycle CDKs. p27 phosphorylation by CDK1/2, signals ...p27KIP1 (cyclin-dependent kinase inhibitor 1B, p27) is a member of the CIP/KIP family of CDK (cyclin dependent kinase) regulators that inhibit cell cycle CDKs. p27 phosphorylation by CDK1/2, signals its recruitment to the SCF (S-phase kinase associated protein 1 (SKP1)-cullin-SKP2) E3 ubiquitin ligase complex for proteasomal degradation. The nature of p27 binding to SKP2 and CKS1 was revealed by the SKP1-SKP2-CKS1-p27 phosphopeptide crystal structure. Subsequently, a model for the hexameric CDK2-cyclin A-CKS1-p27-SKP1-SKP2 complex was proposed by overlaying an independently determined CDK2-cyclin A-p27 structure. Here we describe the experimentally determined structure of the isolated CDK2-cyclin A-CKS1-p27-SKP1-SKP2 complex at 3.4 Å global resolution using cryogenic electron microscopy. This structure supports previous analysis in which p27 was found to be structurally dynamic, transitioning from disordered to nascent secondary structure on target binding. We employed 3D variability analysis to further explore the conformational space of the hexameric complex and uncovered a previously unidentified hinge motion centred on CKS1. This flexibility gives rise to open and closed conformations of the hexameric complex that we propose may contribute to p27 regulation by facilitating recognition with SCF. This 3D variability analysis further informed particle subtraction and local refinement approaches to enhance the local resolution of the complex.
History
DepositionDec 12, 2022Deposition site: PDBE / Processing site: PDBE
Revision 1.0Jun 28, 2023Provider: repository / Type: Initial release
Revision 1.1Jul 19, 2023Group: Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID / _citation_author.name
Revision 1.2Nov 20, 2024Group: Data collection / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Cyclin-dependent kinase 2
B: Cyclin-A2
C: Cyclin-dependent kinase inhibitor 1B
D: S-phase kinase-associated protein 1
E: S-phase kinase-associated protein 2
F: Cyclin-dependent kinases regulatory subunit 1
G: p27 KIP1 C-terminus


Theoretical massNumber of molelcules
Total (without water)177,5867
Polymers177,5867
Non-polymers00
Water00
1


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

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Components

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Cyclin-dependent kinase ... , 2 types, 2 molecules AC

#1: Protein Cyclin-dependent kinase 2 / Cell division protein kinase 2 / p33 protein kinase


Mass: 33994.398 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: Thr160 phosphorylated CDK2 / Source: (gene. exp.) Homo sapiens (human) / Gene: CDK2, CDKN2 / Production host: Escherichia coli BL21(DE3) (bacteria) / Variant (production host): pLySs / References: UniProt: P24941, cyclin-dependent kinase
#3: Protein Cyclin-dependent kinase inhibitor 1B / Cyclin-dependent kinase inhibitor p27 / p27Kip1


Mass: 17678.531 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: p27 kip1 / Production host: Escherichia coli BL21(DE3) (bacteria) / Variant (production host): pLYSs / References: UniProt: O43806

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Protein , 2 types, 2 molecules BF

#2: Protein Cyclin-A2 / Cyclin-A / Cyclin A


Mass: 48609.574 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CCNA2, CCN1, CCNA / Production host: Escherichia coli BL21(DE3) (bacteria) / Variant (production host): pLYSs / References: UniProt: P20248
#6: Protein Cyclin-dependent kinases regulatory subunit 1 / CKS-1


Mass: 9679.211 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CKS1B, CKS1, PNAS-143, PNAS-16 / Production host: Escherichia coli BL21(DE3) (bacteria) / Variant (production host): pLYSs / References: UniProt: P61024

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S-phase kinase-associated protein ... , 2 types, 2 molecules DE

#4: Protein S-phase kinase-associated protein 1 / Cyclin-A/CDK2-associated protein p19 / p19A / Organ of Corti protein 2 / OCP-2 / Organ of Corti ...Cyclin-A/CDK2-associated protein p19 / p19A / Organ of Corti protein 2 / OCP-2 / Organ of Corti protein II / OCP-II / RNA polymerase II elongation factor-like protein / SIII / Transcription elongation factor B polypeptide 1-like / p19skp1


Mass: 18679.965 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SKP1, EMC19, OCP2, SKP1A, TCEB1L / Production host: Escherichia coli BL21(DE3) (bacteria) / Variant (production host): pLYSs / References: UniProt: P63208
#5: Protein S-phase kinase-associated protein 2 / Cyclin-A/CDK2-associated protein p45 / F-box protein Skp2 / F-box/LRR-repeat protein 1 / p45skp2


Mass: 47817.785 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: SKP2, FBXL1 / Production host: Escherichia coli BL21(DE3) (bacteria) / Variant (production host): pLYSs / References: UniProt: Q13309

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Protein/peptide , 1 types, 1 molecules G

#7: Protein/peptide p27 KIP1 C-terminus


Mass: 1126.154 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: C-terminus of p27 KIP1 / Source: (gene. exp.) Homo sapiens (human) / Production host: Escherichia coli BL21(DE3) (bacteria) / Variant (production host): pLYSs

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Details

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: Hexameric complex of SKP1-SKP2-CKS1 with CDK2-CyclinA-p27(kip1)
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.175 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria) / Strain: BL21(DE3)pLYSs
Buffer solutionpH: 7.8
SpecimenConc.: 0.2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 278.15 K

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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 / Nominal magnification: 130000 X / Nominal defocus max: 3000 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm
Specimen holderCryogen: NITROGEN
Image recordingAverage exposure time: 9 sec. / Electron dose: 65 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM software
IDNameCategoryDetails
1cryoSPARCparticle selectionblob picker
2EPUimage acquisition
4cryoSPARCCTF correction
7UCSF ChimeraXmodel fitting
9PHENIXmodel refinement
10cryoSPARCinitial Euler assignmenthomogeneous refinement
11cryoSPARCfinal Euler assignmentnon-uniform refinement
12cryoSPARCclassificationheterogenous refinement
13cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1110356
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.38 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 136325 / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingB value: 121 / Protocol: RIGID BODY FIT / Space: REAL
Details: Initial fitting was performed in chimera followed by real space refinement in Phenix
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0058609
ELECTRON MICROSCOPYf_angle_d0.69811782
ELECTRON MICROSCOPYf_dihedral_angle_d5.411210
ELECTRON MICROSCOPYf_chiral_restr0.0421395
ELECTRON MICROSCOPYf_plane_restr0.0061509

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