| 1995 |
Crystal structure of human CksHs1 determined at 2.9 Å resolution, revealing a single polypeptide domain fold with a four-stranded beta-sheet flanked by two alpha-helices, and identifying a phosphate-binding pocket with conserved residues Lys11, Arg20, Ser51, Trp54, and Arg71 as a potential recognition site for phosphorylated CDK residues. A novel beta-hinge region (Glu61–His65) was identified that controls monomer versus domain-swapped dimer conformation. |
X-ray crystallography at 2.9 Å resolution |
Journal of molecular biology |
High |
7791211
|
| 1996 |
Crystal structure of human CDK2 in complex with CksHs1 at 2.6 Å resolution revealed that CksHs1 binds via all four beta-strands to the CDK2 C-terminal lobe, far from the N-terminal lobe, cyclin, and regulatory phosphorylation sites. Mutational analysis confirmed this interface is biologically critical. The beta-hinge opening to form the domain-swapped dimer sterically precludes CDK2 binding. The complex exposes the phosphate-binding region of Cks and the ATP-binding site of CDK2 on one face, suggesting CKS1B targets CDK2 to phosphoproteins. |
X-ray crystallography at 2.6 Å + site-directed mutagenesis |
Cell |
High |
8601310
|
| 1995 |
TGF-beta treatment strongly downregulates CKShs1 transcripts in mink lung cells and keratinocytes within 10 hours (prior to growth arrest), and this downregulation is abolished in cells expressing a dominant-negative TGF-beta type 2 receptor. This places CKShs1 downstream of TGF-beta receptor signaling and suggests a role in TGF-beta-mediated G1/G2 cell cycle arrest. |
Northern blot analysis; genetic test using stably transfected dominant-negative TGF-beta receptor cell line |
Cell growth & differentiation |
Medium |
8845303
|
| 2001 |
The carboxyl-terminal region of p45(SKP2) directly associates with CksHs1, and this interaction negatively regulates the binding of CksHs1 to CDK2. Overexpression of CksHs1 inhibits CDK2 kinase activity, and additional expression of p45(SKP2) overcomes this inhibition and restores CDK2 kinase activity. The proposed mechanism is that SKP2 sequesters CksHs1, preventing it from binding and inhibiting CDK2. |
Co-immunoprecipitation, CDK2 kinase activity assay, overexpression experiments |
The Journal of biological chemistry |
Medium |
11349131
|
| 2002 |
CksHs1 has marginal thermodynamic stability (ΔG ~3.0 kcal/mol at 25°C) and low kinetic stability (unfolding rate ~1 s⁻¹ in water). Refolding from denatured states to monomeric form is slowed by transient oligomerization via domain swapping. Interconversion between monomer and domain-swapped dimer requires unfolding and is faster in CksHs1 than in yeast suc1, reflecting faster unfolding rates. |
Biochemical folding/unfolding kinetics assays, equilibrium denaturation |
Biochemistry |
Medium |
11802719
|
| 2005 |
RNA interference knockdown of CKS1B mRNA in myeloma cell lines led to reduced CKS1B protein, accumulation of p27Kip1, and profound growth inhibition, establishing that CKS1B regulates SCF(Skp2)-mediated ubiquitination and proteolysis of p27Kip1 in myeloma cells. |
RNAi knockdown; Western blot for p27Kip1; cell proliferation assay |
Hematology |
Medium |
16188652
|
| 2007 |
Lentiviral shRNA knockdown of CKS1B in multiple myeloma cell lines caused stabilization of p27Kip1, cell cycle arrest, and apoptosis. Notably, CKS1B ablation induced strong apoptosis even in a cell line with biallelic deletion of p27Kip1 (CDKN1B), demonstrating that CKS1B regulates myeloma cell survival through both SKP2/p27Kip1-dependent and independent mechanisms. |
Lentiviral shRNA knockdown; cell cycle analysis; apoptosis assay; forced expression of non-degradable p27T187A; SKP2 knockdown |
Blood |
High |
17303695
|
| 2010 |
Forced expression of CKS1B in multiple myeloma cells activated STAT3 and MEK/ERK signaling pathways and increased multidrug resistance. Stimulation of these pathways partially rescued cells from CKS1B-knockdown-induced death, and BCL2 was identified as a downstream target of MEK/ERK signaling in this context. |
Forced overexpression; shRNA knockdown; pathway inhibitors; Western blot; cell viability assay |
Oncotarget |
Medium |
20930946
|
| 2015 |
CKS1B mechanistically connects to a miR-197/CKS1B/STAT3 axis regulating PD-L1 expression and chemoresistance in NSCLC. miR-197 targets CKS1B, and loss of miR-197 leads to CKS1B upregulation driving STAT3-mediated expression of oncogenic genes (Bcl-2, c-Myc, cyclin D1) and PD-L1. miR-197 mimic sensitized PD-L1-high drug-resistant cells to chemotherapy. |
In vitro and in vivo functional assays; miR-197 mimic transfection; mechanistic pathway analysis |
Molecular therapy |
Medium |
25597412
|
| 2015 |
CKS1B-overexpressing myeloma cells are resistant to the proteasome inhibitor bortezomib but sensitive to the NEDD8 inhibitor MLN4924. MLN4924 induced stabilization of p21 (not p27), and shRNA knockdown of p21 abolished MLN4924 sensitivity, establishing that MLN4924 overcomes CKS1B-induced drug resistance via p21 stabilization rather than p27. |
shRNA knockdown of p21; proliferation, viability, clonogenic, and senescence assays; immunoblot analysis |
Clinical cancer research |
Medium |
26156395
|
| 2016 |
Genetic epistasis in yeast showed that CKS1 overexpression synthetic dosage lethality (SDL) with mitotic entry checkpoint genes requires Swe1 inhibitory activity on CDK Cdc28, and SDL with mitotic exit network genes is suppressed by modulating CDK inhibitor Sic1. Mutation of polo-like kinase Cdc5 (human PLK1 ortholog) is lethal with overexpressed CKS1. In human cancer cells, CKS1B overexpression increased sensitivity to PLK1 knockdown and pharmacological PLK1 inhibition, conserving the yeast SDL interaction. |
High-throughput yeast SDL screen; epistasis with Swe1 and Sic1 mutants; shRNA knockdown of PLK1 in human tumor cell lines; PLK1 inhibitor treatment of CKS1B-overexpressing cells; WEE1+PLK1 double inhibition epistasis |
Genetics |
High |
27558135
|
| 2017 |
Ectopic CKS1B overexpression in lung cancer cells induced chemoresistance to cisplatin and doxorubicin through Hsp90 and MEK1/2 pathways, independent of the canonical Skp2-p27 pathway. Inhibition of either Hsp90 or MEK1/2 alone resensitized CKS1B-overexpressing cells to chemotherapy, and 3-COA was identified as a novel Hsp90 inhibitor that mimics this resensitization. |
shRNA knockdown; selective pathway inhibitors (Hsp90, MEK1/2); in vitro and in vivo tumor models; overexpression of CKS1B |
Biochemical pharmacology |
Medium |
28288818
|
| 2024 |
GLI2 directly binds the CKS1B promoter to regulate CKS1B transcription in cardiomyocytes (CMs). CKS1B overexpression in late-stage hiPSC-CMs promoted proliferation with loss of maturation, identifying CKS1B as a downstream effector of the HH-GLI2 signaling cascade that controls the proliferation-to-maturation transition in CMs. |
GLI2 promoter binding assay (ChIP-type); hiPSC-CM overexpression of CKS1B; maturation indices; calcium handling measurements; transcriptomic analysis |
Stem cells translational medicine |
Medium |
38761090
|
| 2021 |
CKS1B knockdown in hepatocellular carcinoma (HCC) cell lines inhibited proliferation, induced apoptosis, suppressed migration and invasion, and decreased p-STAT3 levels and STAT3 target genes (TIMP-1, Bcl-2, VEGF). Overexpression of CKS1B had opposite effects, establishing CKS1B promotion of HCC progression via JAK/STAT3 pathway activation. |
shRNA knockdown; overexpression plasmid; MTT, colony formation, flow cytometry, wound healing, transwell assays; Western blot for p-STAT3 and targets |
Animal cells and systems |
Medium |
34408811
|
| 2025 |
CKS1B forms a complex with S-phase kinase-associated protein (SKP1/SKP2) to promote ubiquitination and degradation of IRF3 (interferon regulatory factor 3), thereby suppressing type I interferon signaling and antigen presentation in tumor cells. This drives persistent CD8+ T cell stimulation and exhaustion. Pharmacological blockade of the CKS1B-IRF3 interaction with compound 14i restored CD8+ T cell function and synergized with immune checkpoint blockade. |
Single-cell and spatial proteomics; co-immunoprecipitation (CKS1B-SKP complex with IRF3); ubiquitination assay; pharmacological blockade with 14i; in vivo tumor models; immune checkpoint blockade combination |
Science advances |
Medium |
42090485
|
| 2025 |
FOXM1 transcriptionally regulates CKS1B expression in pancreatic ductal adenocarcinoma (PDAC), establishing a novel FOXM1-CKS1B signaling axis. CKS1B knockdown sensitized PDAC cells to gemcitabine and oxaliplatin and reduced cancer stemness properties. |
Molecular biology methods (chromatin binding/promoter assays implied); in vitro and in vivo PDAC models; CKS1B knockdown with chemosensitivity assays; stemness assays |
International journal of biological sciences |
Low |
39897042
|
| 2020 |
CKS1B knockdown in papillary thyroid carcinoma (PTC) cells inhibited cell viability and invasion, suppressed STAT3/PD-L1 signaling, and reduced Akt phosphorylation. STAT3 or PD-L1 inhibition reversed the pro-tumorigenic effects of CKS1B overexpression. |
siRNA knockdown; overexpression plasmid; MTT and transwell assays; Western blot for p-STAT3, p-Akt, PD-L1; pharmacological inhibitors (WP1066, Pembrolizumab) |
Journal of clinical laboratory analysis |
Low |
32960462
|
| 2025 |
CKS1B knockdown in NSCLC cells inhibited proliferation, migration, and invasion; reduced MEK and ERK phosphorylation (MAPK/ERK signaling); and upregulated E-cadherin while downregulating N-cadherin, suppressing EMT. |
siRNA knockdown; Western blot for p-MEK, p-ERK, E-cadherin, N-cadherin; proliferation and invasion assays |
Discover oncology |
Low |
41171587
|
| 2025 |
CKS1B knockdown in NSCLC cells and xenografts enhanced radiosensitivity by stimulating apoptosis, inhibiting cell cycle progression, and impairing DNA damage repair. CKS1B-induced radioresistance was mediated through the PI3K/AKT signaling pathway. |
shRNA knockdown; xenograft model with ionizing radiation; apoptosis, cell cycle, DNA damage repair assays; Western blot for PI3K/AKT pathway components |
Cellular signalling |
Low |
40262716
|