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- PDB-8byl: Cryo-EM structure of SKP1-SKP2-CKS1 from the SCFSKP2 E3 ligase complex -
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Open data
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Basic information
Entry | Database: PDB / ID: 8byl | ||||||
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Title | Cryo-EM structure of SKP1-SKP2-CKS1 from the SCFSKP2 E3 ligase complex | ||||||
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![]() | CELL CYCLE / cyclin-dependent kinase / signalling / ubiquitinationCell cycle | ||||||
Function / homology | ![]() 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 / positive regulation of protein polyubiquitination / autophagic cell death / 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 / positive regulation of protein polyubiquitination / autophagic cell death / 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 / mitotic cell cycle phase transition / epithelial cell proliferation involved in prostate gland development / negative regulation of epithelial cell apoptotic process / negative regulation of cyclin-dependent protein serine/threonine kinase activity / ubiquitin ligase activator activity / negative regulation of phosphorylation / 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 / positive regulation of intracellular estrogen receptor signaling pathway / AKT phosphorylates targets in the cytosol / Cul4A-RING E3 ubiquitin ligase complex / epithelial cell apoptotic process / SCF ubiquitin ligase complex / cellular response to antibiotic / ubiquitin ligase complex scaffold activity / negative regulation of kinase activity / SCF-dependent proteasomal ubiquitin-dependent protein catabolic process / regulation of cyclin-dependent protein serine/threonine kinase activity / molecular function inhibitor activity / cellular response to lithium ion / protein kinase inhibitor activity / p53-Dependent G1 DNA Damage Response / Prolactin receptor signaling / PTK6 Regulates Cell Cycle / 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 / localization / response to amino acid / Nuclear events stimulated by ALK signaling in cancer / 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 / Notch signaling pathway / regulation of cell migration / Hsp70 protein binding / regulation of mitotic cell cycle / DNA damage response, signal transduction by p53 class mediator resulting in cell cycle arrest / FLT3 Signaling / Regulation of BACH1 activity / MAP3K8 (TPL2)-dependent MAPK1/3 activation / cyclin binding / 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 / 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 / potassium ion transport / Degradation of beta-catenin by the destruction complex / placenta development / DNA Damage/Telomere Stress Induced Senescence / negative regulation of cell growth / NOTCH1 Intracellular Domain Regulates Transcription / CLEC7A (Dectin-1) signaling Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å | ||||||
![]() | Rowland, R.J. / Salamina, M. / Endicott, J.A. / Noble, M.E.M. | ||||||
Funding support | ![]()
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![]() | ![]() 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 |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 124.8 KB | Display | ![]() |
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PDB format | ![]() | 93.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.3 MB | Display | ![]() |
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Full document | ![]() | 1.3 MB | Display | |
Data in XML | ![]() | 34.5 KB | Display | |
Data in CIF | ![]() | 48.6 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 16327MC ![]() 8byaC ![]() 8bzoC C: citing same article ( M: map data used to model this data |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 18679.965 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
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#2: Protein | Mass: 47817.785 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#3: Protein | Mass: 9679.211 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#4: Protein | Mass: 22188.303 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Details: DGSPNAGSVEQ(TPO)PKK / Source: (gene. exp.) ![]() ![]() ![]() |
Has ligand of interest | N |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Locally refined complex of SKP1-SKP2-CKS1-p27 from the hexametric SCFSKP2 E3 Ligase complex Type: COMPLEX / Entity ID: all / Source: RECOMBINANT |
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Molecular weight | Value: 0.066 MDa / Experimental value: NO |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.8 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: COPPER / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R1.2/1.3 |
Vitrification | Instrument: 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 |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: 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 holder | Cryogen: NITROGEN |
Image recording | Average 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 |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 1110356 | ||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 136325 / Num. of class averages: 1 / Symmetry type: POINT | ||||||||||||||||||||||||||||||||||||||||
Atomic model building | B 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 |
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