RB-E2F Activity Profiling Service for Cell Cycle Control
Creative Biolabs' service provides the "molecular eyes" needed to see beyond total protein levels. We deliver a functional readout of the RB-E2F axis, enabling you to determine if your therapeutic agent induces a reversible "primed" state, permanent senescence, or apoptotic exit. By mapping the assembly of repressor complexes (DREAM, RB-LSD1) versus activator complexes (B-MYB/FOXM1), we ensure your project targets the correct phase of the cell cycle with surgical precision.
Background What We Can Offer Workflow Publication Why Choose Us FAQs Customer Review Related Services Contact Us
The RB-E2F Axis: The Master Switch of Life and Death
The G1-S transition is governed by an RB-E2F regulatory hierarchy. Beyond binary switches, a four-state model exists: Repressive, where RB-E2F and the DREAM complex recruit LSD1 for epigenetic silencing; Primed, a reversible state triggered by Rb T373 phosphorylation; Activating, where hyperphosphorylation releases E2Fs 1-3 and B-MYB/FOXM1 to trigger S-phase and Mitotic waves; and Pathological, where pathogens like HPV or EBV bypass the Rb-LSD1 checkpoint. This sophisticated orchestration ensures precise genomic integrity, while its disruption forces constitutive, "unbridled" proliferation and apoptotic evasion.
Comprehensive Profiling Solutions
To provide a complete map of the RB-E2F regulatory landscape, Creative Biolabs offers a modular suite of services that can be tailored to your specific therapeutic goals. Our offerings are divided into four technical pillars:
Kinetic State & Phospho-Stoichiometry Mapping
We identify distinct states of RB activity by monitoring T373 and Ser807/811 via mass spectrometry, allowing researchers to determine the precise threshold for irreversible cell cycle commitment and drug response.
Epigenetic & Interactome Analysis
We map the physical assembly of repressor complexes, including LSD1 and SWI/SNF, and quantify DREAM complex dynamics to differentiate between transient gene inhibition and stable, long-term epigenetic silencing in oncology.
High-Resolution Transcription Profiling
Our platform measures functional outputs at the genomic level, utilizing ChIP-Seq to map promoter occupancy and analyzing dual-wave gene expression to evaluate the transition from DNA replication to mitotic division.
Specialized Model Systems & Validation
We support diverse biological contexts, including viral oncogenesis models for HPV and EBV, alongside optimized protocols for primary hematopoietic cells and live-cell imaging using advanced E2F-reporter biosensors for real-time tracking.
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Workflow
Creative Biolabs utilizes a rigorous, multi-phasic pipeline designed to translate complex cellular samples into actionable mechanistic data.
Publication
This study reveals how mammalian cells safeguard proliferation decisions through a regulated intermediate state. By monitoring E2F and CDK2 activities in single cells, researchers identified a reversible primed G1 phase where E2F is partially activated via specific phosphorylation of the Rb protein at residue T373. This intermediate state allows cells to integrate fluctuating signals before committing to either quiescence or proliferation, preventing inappropriate cell division driven by spurious signals.
Fig.1 Live-cell E2F transcription analysis unveils diverse activation kinetics.1
Why Choose Us?
Creative Biolabs stands at the scientific forefront of cell cycle regulation, offering a unique profiling platform that integrates high-impact discoveries regarding the intermediate primed state and the RB-LSD1 epigenetic eraser complex. Unlike traditional binary assays, our technology distinguishes between three critical E2F activity levels to determine precise therapeutic commitment points. We leverage published data to benchmark your results against established cell-cycle thresholds, ensuring clinical relevance. With a decade of expertise in interactome mapping and single-cell kinetics, we empower partners to bypass the ambiguity of total protein measurements, delivering deep mechanistic insights required to accelerate high-value drug development pipelines.
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FAQs
How does this service differ from standard E2F reporter assays?
While standard assays measure total transcriptional output, we provide "activity-state" profiling that distinguishes between intermediate (primed) and high (committed) E2F activity levels.
Can you analyze non-canonical RB interactors like SWI/SNF or LSD1?
Yes, our interactome mapping is specifically designed to detect E2F-independent RB complexes that recruit epigenetic modifiers.
How do you handle cell cycle synchronization?
We offer multiple options, from chemical synchronization to centrifugal elutriation for "stress-free" cell cycle fractionation.
Customer Review
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Unprecedented Kinetic Resolution
Using Creative Biolabs' RB-E2F activity profiling in our research has significantly facilitated our understanding of G1-phase exit. The ability to monitor T373 phosphorylation stoichiometry was a game-changer for our CDK inhibitor project. - Dr. J***n S
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Comprehensive Cell Cycle Mapping
Using the RB-E2F profiling in our research has significantly facilitated our study of viral latency. The workflow successfully distinguished between E2F-dependent and independent functions of the RB protein in EBV-infected cells. - Dr. K***t R
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How to Contact Creative Biolabs
The E2F/Rb molecular switch is not just a genetic gatekeeper—it is an epigenetic coordinator. By profiling the assembly of Rb-LSD1 and DREAM complexes, you gain the clarity needed to move your lead candidates forward with confidence.
For detailed information or to discuss your specific project needs with our scientists, please reach out to us.
Reference
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Konagaya, Yumi, et al. "An intermediate Rb–E2F activity state safeguards proliferation commitment." Nature 631.8020 (2024): 424-431. Distributed under Open Access license CC BY 4.0, without modification. https://doi.org/10.1038/s41586-024-07554-2
For Research Use Only | Not For Clinical Use
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