cyclin-dependent protein kinase regulator activity / regulation of lens fiber cell differentiation / negative regulation of cyclin-dependent protein kinase activity / negative regulation of cardiac muscle tissue regeneration / negative regulation of kinase activity / positive regulation of protein polyubiquitination / autophagic cell death / FOXO-mediated transcription of cell cycle genes / F-box domain binding / negative regulation of epithelial cell proliferation involved in prostate gland development ...cyclin-dependent protein kinase regulator activity / regulation of lens fiber cell differentiation / negative regulation of cyclin-dependent protein kinase activity / negative regulation of cardiac muscle tissue regeneration / negative regulation of kinase activity / positive regulation of protein polyubiquitination / autophagic cell death / FOXO-mediated transcription of cell cycle genes / F-box domain binding / negative regulation of epithelial cell proliferation involved in prostate gland development / negative regulation of cyclin-dependent protein serine/threonine kinase activity / cellular response to cell-matrix adhesion / Aberrant regulation of mitotic exit in cancer due to RB1 defects / regulation of cell cycle G1/S phase transition / PcG protein complex / regulation of exit from mitosis / negative regulation of epithelial cell apoptotic process / epithelial cell proliferation involved in prostate gland development / positive regulation of ubiquitin protein ligase activity / cyclin-dependent protein serine/threonine kinase inhibitor activity / Cul7-RING ubiquitin ligase complex / Loss of Function of FBXW7 in Cancer and NOTCH1 Signaling / maintenance of protein location in nucleus / ubiquitin ligase activator activity / regulation of cyclin-dependent protein serine/threonine kinase activity / RHO GTPases activate CIT / cyclin-dependent protein serine/threonine kinase activator activity / nuclear export / negative regulation of mitotic cell cycle / AKT phosphorylates targets in the cytosol / epithelial cell apoptotic process / cellular response to antibiotic / SCF ubiquitin ligase complex / molecular function inhibitor activity / SCF-dependent proteasomal ubiquitin-dependent protein catabolic process / cellular response to lithium ion / positive regulation of intracellular estrogen receptor signaling pathway / Cul4A-RING E3 ubiquitin ligase complex / Prolactin receptor signaling / ubiquitin ligase complex scaffold activity / p53-Dependent G1 DNA Damage Response / Constitutive Signaling by AKT1 E17K in Cancer / PTK6 Regulates Cell Cycle / protein kinase inhibitor activity / Defective binding of RB1 mutants to E2F1,(E2F2, E2F3) / inner ear development / negative regulation of vascular associated smooth muscle cell proliferation / regulation of G1/S transition of mitotic cell cycle / cullin family protein binding / protein K63-linked ubiquitination / Estrogen-dependent nuclear events downstream of ESR-membrane signaling / protein monoubiquitination / TP53 Regulates Transcription of Genes Involved in G1 Cell Cycle Arrest / ubiquitin-like ligase-substrate adaptor activity / protein K48-linked ubiquitination / Cyclin E associated events during G1/S 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 / Notch signaling pathway / positive regulation of microtubule polymerization / FLT3 Signaling / positive regulation of smooth muscle cell proliferation / cyclin binding / regulation of mitotic cell cycle / regulation of cell migration / Regulation of BACH1 activity / molecular function activator activity / MAP3K8 (TPL2)-dependent MAPK1/3 activation / placenta development / positive regulation of DNA replication / ubiquitin binding / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / Vpu mediated degradation of CD4 / DNA damage response, signal transduction by p53 class mediator / Dectin-1 mediated noncanonical NF-kB signaling / Activation of NF-kappaB in B cells / Degradation of GLI1 by the proteasome / Iron uptake and transport / sensory perception of sound / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / Negative regulation of NOTCH4 signaling / G1/S transition of mitotic cell cycle / FBXL7 down-regulates AURKA during mitotic entry and in early mitosis / Degradation of GLI2 by the proteasome / GLI3 is processed to GLI3R by the proteasome / APC/C:Cdh1 mediated degradation of Cdc20 and other APC/C:Cdh1 targeted proteins in late mitosis/early G1 / negative regulation of cell growth / Degradation of beta-catenin by the destruction complex / beta-catenin binding / NOTCH1 Intracellular Domain Regulates Transcription / potassium ion transport / DNA Damage/Telomere Stress Induced Senescence / CLEC7A (Dectin-1) signaling / SCF(Skp2)-mediated degradation of p27/p21 / Constitutive Signaling by NOTCH1 PEST Domain Mutants / Constitutive Signaling by NOTCH1 HD+PEST Domain Mutants / FCERI mediated NF-kB activation 類似検索 - 分子機能
ジャーナル: Sci Rep / 年: 2023 タイトル: Cryo-EM structure of SKP1-SKP2-CKS1 in complex with CDK2-cyclin A-p27KIP1. 著者: 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 / 要旨: 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.