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- PDB-8byl: Cryo-EM structure of SKP1-SKP2-CKS1 from the SCFSKP2 E3 ligase complex -

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Basic information

Entry
Database: PDB / ID: 8byl
TitleCryo-EM structure of SKP1-SKP2-CKS1 from the SCFSKP2 E3 ligase complex
Components
  • Cyclin-dependent kinase inhibitor 1B
  • Cyclin-dependent kinases regulatory subunit 1
  • S-phase kinase-associated protein 1
  • S-phase kinase-associated protein 2
KeywordsCELL CYCLE / cyclin-dependent kinase / signalling / ubiquitinationCell cycle
Function / homology
Function and homology information


cyclin-dependent protein kinase activating kinase regulator activity / regulation of lens fiber cell differentiation / negative regulation of cardiac muscle tissue regeneration / negative regulation of cyclin-dependent protein kinase activity / autophagic cell death / positive regulation of protein polyubiquitination / negative regulation of epithelial cell proliferation involved in prostate gland development / FOXO-mediated transcription of cell cycle genes / F-box domain binding / Aberrant regulation of mitotic exit in cancer due to RB1 defects ...cyclin-dependent protein kinase activating kinase regulator activity / regulation of lens fiber cell differentiation / negative regulation of cardiac muscle tissue regeneration / negative regulation of cyclin-dependent protein kinase activity / autophagic cell death / positive regulation of protein polyubiquitination / negative regulation of epithelial cell proliferation involved in prostate gland development / FOXO-mediated transcription of cell cycle genes / F-box domain binding / Aberrant regulation of mitotic exit in cancer due to RB1 defects / PcG protein complex / regulation of cell cycle G1/S phase transition / regulation of exit from mitosis / epithelial cell proliferation involved in prostate gland development / mitotic cell cycle phase transition / negative regulation of epithelial cell apoptotic process / negative regulation of cyclin-dependent protein serine/threonine kinase activity / negative regulation of phosphorylation / ubiquitin ligase activator activity / Cul7-RING ubiquitin ligase complex / positive regulation of ubiquitin protein ligase activity / cyclin-dependent protein serine/threonine kinase inhibitor activity / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling / maintenance of protein location in nucleus / RHO GTPases activate CIT / cyclin-dependent protein serine/threonine kinase activator activity / nuclear export / AKT phosphorylates targets in the cytosol / Cul4A-RING E3 ubiquitin ligase complex / epithelial cell apoptotic process / SCF ubiquitin ligase complex / cellular response to antibiotic / positive regulation of intracellular estrogen receptor signaling pathway / ubiquitin ligase complex scaffold activity / negative regulation of kinase activity / SCF-dependent proteasomal ubiquitin-dependent protein catabolic process / cellular response to lithium ion / molecular function inhibitor activity / protein kinase inhibitor activity / p53-Dependent G1 DNA Damage Response / Prolactin receptor signaling / PTK6 Regulates Cell Cycle / regulation of cyclin-dependent protein serine/threonine kinase activity / Constitutive Signaling by AKT1 E17K in Cancer / regulation of G1/S transition of mitotic cell cycle / protein monoubiquitination / negative regulation of vascular associated smooth muscle cell proliferation / Defective binding of RB1 mutants to E2F1,(E2F2, E2F3) / cullin family protein binding / protein K63-linked ubiquitination / inner ear development / cellular response to organic cyclic compound / ubiquitin-like ligase-substrate adaptor activity / positive regulation of double-strand break repair via homologous recombination / negative regulation of mitotic cell cycle / Estrogen-dependent nuclear events downstream of ESR-membrane signaling / cyclin-dependent protein kinase holoenzyme complex / Nuclear events stimulated by ALK signaling in cancer / response to amino acid / localization / protein K48-linked ubiquitination / TP53 Regulates Transcription of Genes Involved in G1 Cell Cycle Arrest / response to glucose / response to cadmium ion / Cyclin E associated events during G1/S transition / Cyclin A:Cdk2-associated events at S phase entry / positive regulation of microtubule polymerization / regulation of cell migration / Notch signaling pathway / Hsp70 protein binding / DNA damage response, signal transduction by p53 class mediator resulting in cell cycle arrest / regulation of mitotic cell cycle / FLT3 Signaling / Regulation of BACH1 activity / cyclin binding / MAP3K8 (TPL2)-dependent MAPK1/3 activation / positive regulation of DNA replication / ubiquitin binding / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / molecular function activator activity / Vpu mediated degradation of CD4 / Dectin-1 mediated noncanonical NF-kB signaling / placenta development / Degradation of GLI1 by the proteasome / Activation of NF-kappaB in B cells / sensory perception of sound / Negative regulation of NOTCH4 signaling / Iron uptake and transport / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / Degradation of GLI2 by the proteasome / GLI3 is processed to GLI3R by the proteasome / FBXL7 down-regulates AURKA during mitotic entry and in early mitosis / APC/C:Cdh1 mediated degradation of Cdc20 and other APC/C:Cdh1 targeted proteins in late mitosis/early G1 / Degradation of beta-catenin by the destruction complex / potassium ion transport / negative regulation of cell growth / DNA Damage/Telomere Stress Induced Senescence / G1/S transition of mitotic cell cycle / NOTCH1 Intracellular Domain Regulates Transcription
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 / Leucine-rich repeat, cysteine-containing subtype ...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 / Leucine-rich repeat, cysteine-containing subtype / Leucine-rich repeat - CC (cysteine-containing) subfamily / A Receptor for Ubiquitination Targets / F-box domain profile. / F-box-like domain superfamily / F-box-like / SKP1 component, dimerisation / S-phase kinase-associated protein 1 / SKP1-like, dimerisation domain superfamily / Skp1 family, dimerisation domain / F-box domain / S-phase kinase-associated protein 1-like / SKP1 component, POZ domain / Skp1 family, tetramerisation domain / Found in Skp1 protein family / SKP1/BTB/POZ domain superfamily / Leucine-rich repeat domain superfamily
Similarity search - Domain/homology
Cyclin-dependent kinase inhibitor 1B / 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: 3.5 Å
AuthorsRowland, R.J. / Salamina, M. / Endicott, J.A. / Noble, M.E.M.
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 13, 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.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: S-phase kinase-associated protein 1
B: S-phase kinase-associated protein 2
C: Cyclin-dependent kinases regulatory subunit 1
D: Cyclin-dependent kinase inhibitor 1B


Theoretical massNumber of molelcules
Total (without water)98,3654
Polymers98,3654
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area5870 Å2
ΔGint-42 kcal/mol
Surface area28310 Å2

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Components

#1: 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
#2: 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
#3: 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
#4: Protein Cyclin-dependent kinase inhibitor 1B / Cyclin-dependent kinase inhibitor p27 / p27Kip1


Mass: 22188.303 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: DGSPNAGSVEQ(TPO)PKK / Source: (gene. exp.) Homo sapiens (human) / Gene: CDKN1B, KIP1 / Production host: Escherichia coli BL21(DE3) (bacteria) / Variant (production host): pLYSs / References: UniProt: P46527
Has ligand of interestN

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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: Locally refined complex of SKP1-SKP2-CKS1-p27 from the hexametric SCFSKP2 E3 Ligase complex
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightValue: 0.066 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.8
SpecimenEmbedding 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 FIELDBright-field microscopy / 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 selection
2EPUimage acquisition
4cryoSPARCCTF correction
7UCSF ChimeraXmodel fitting
9PHENIXmodel refinement
10cryoSPARCinitial Euler assignmenthomogenous refinement
11cryoSPARCfinal Euler assignmentlocal refinement
12cryoSPARCclassification
13cryoSPARC3D reconstructionParticle subtraction followed by local refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 1110356
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 136325 / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingB value: 122 / 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_d0.0034480
ELECTRON MICROSCOPYf_angle_d0.6016107
ELECTRON MICROSCOPYf_dihedral_angle_d7.49602
ELECTRON MICROSCOPYf_chiral_restr0.045712
ELECTRON MICROSCOPYf_plane_restr0.005790

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