Recombinant monoclonal FUBP1 antibodies are produced using hybridoma or single B-cell cloning technologies. Key features include:
FUBP1 antibodies are utilized in:
Cancer Biology: Detecting FUBP1 overexpression in tumor tissues (e.g., breast cancer, glioblastoma) .
Mechanistic Studies: Investigating FUBP1’s role in RNA splicing and m⁶A methylation .
Functional Assays: Silencing FUBP1 in vitro/in vivo to study apoptosis and differentiation .
Cooperation with Tumor Suppressors: FUBP1 loss synergizes with PTEN deletion to drive tumorigenesis in mammary epithelial cells .
Splicing Regulation: FUBP1 binds AU-rich RNA elements to inhibit second-step splicing in TRIAD3 pre-mRNA .
Oncogenic Role: FUBP1 depletion reduces tumor growth in xenograft models, highlighting its potential as a therapeutic target .
Splicing Dysregulation: FUBP1 loss alters global RNA splicing, generating oncogenic isoform variants .
Viral Interactions: Binds hepatitis C virus RNA to facilitate replication .
FUBP1, a DNA and RNA binding protein, primarily regulates the transcription of its target genes. By controlling intricate networks, FUBP1 stimulates cell proliferation, inhibits apoptosis, and enhances cell migration. Its overexpression is prevalent in various cancers, including renal cell carcinoma, breast cancer, prostate cancer, and bladder cancer. Loss-of-function studies demonstrate the critical roles of FUBP1 in maintaining and sustaining hematopoietic stem cells.
This recombinant FUBP1 antibody was developed through the Single B cell platform. The process involved identifying and isolating single B cells, amplifying and cloning the FUBP1 antibody gene, followed by expression, screening, and validation of antibody specificity. This FUBP1 antibody has been thoroughly validated in ELISA, WB, IHC, IF, FC, and IP assays.
FUBP1 regulates MYC expression by binding to a single-stranded far-upstream element (FUSE) located upstream of the MYC promoter. It can act as both an activator and a repressor of transcription.
FUBP1 is a single-stranded DNA and RNA-binding protein that binds to multiple DNA elements, particularly the far upstream element (FUSE) located upstream of c-myc. It contains three functional domains: an amphipathic helix N-terminal domain, a DNA-binding central domain, and a C-terminal transactivation domain with three tyrosine-rich motifs .
FUBP1's significance in cancer research stems from several key functions:
Regulation of c-MYC expression in undifferentiated cells
Modulation of post-transcriptional events including translation, mRNA stability, and splicing
Involvement in N6-methyladenosine (m6A) RNA methylation
Cooperation with tumor suppressor genes (e.g., PTEN, TP53, RB1) in oncogenesis
3'-5' helicase activity on both DNA-DNA and RNA-RNA duplexes
Recent research has identified FUBP1 as a long tail cancer driver, whose loss leads to global changes in RNA splicing and expression of aberrant driver isoforms, making it a promising target for therapeutic intervention and diagnostic development .
FUBP1 recombinant monoclonal antibodies have been validated for multiple experimental applications with specific dilution recommendations:
Application | Recommended Dilution | Verified Samples |
---|---|---|
Western Blot (WB) | 1:500-1:1000 | K562, Rat Brain, HeLa, Jurkat, Raji |
Immunohistochemistry (IHC-P) | 1:100-1:200 | Human colon cancer |
Immunofluorescence (IF) | 1:50-1:100 | Not specified |
Immunoprecipitation (IP) | As recommended by manufacturer | Human samples |
Flow Cytometry (Intracellular) | As recommended by manufacturer | Human samples |
ELISA | Validated, dilution varies by kit | Not specified |
The antibodies show reactivity with human, mouse, and rat samples, making them versatile tools for comparative studies across species .
FUBP1 antibodies can differentiate between normal and pathological protein function through several methodological approaches:
Expression level analysis: Western blotting can quantify FUBP1 levels, which are often aberrantly expressed in malignant tissues. The observed molecular weight of 74 kDa (compared to calculated 68 kDa) may indicate post-translational modifications that differ between normal and pathological states .
Localization studies: Immunohistochemistry and immunofluorescence can reveal altered subcellular localization of FUBP1 in disease states, particularly important since FUBP1 functions in both nuclear and cytoplasmic compartments.
Protein-protein interaction analysis: Immunoprecipitation using FUBP1 antibodies can identify differential binding partners in normal versus disease conditions, especially relevant for its interactions with spliceosomal complexes .
Functional domain mapping: Since FUBP1 contains distinct functional domains, antibodies targeting specific regions can help assess domain-specific functions that may be disrupted in pathological conditions .
For accurate interpretation, researchers should correlate antibody findings with functional assays that measure FUBP1's effects on c-myc expression, RNA splicing patterns, and m6A methylation levels .
For optimal Western blot results with FUBP1 recombinant monoclonal antibodies, follow these methodological guidelines:
Sample preparation:
Electrophoresis and transfer conditions:
Antibody incubation:
Detection system:
Use appropriate secondary antibody (e.g., HRP-conjugated anti-rabbit IgG for rabbit monoclonal antibodies)
If signal is weak, consider signal enhancement systems compatible with your detection method
Controls:
The Western blot pattern should show a predominant band at approximately 74 kDa, though additional bands may represent isoforms resulting from alternative splicing, which is particularly relevant given FUBP1's role in splicing regulation .
For effective immunohistochemistry (IHC) experiments with FUBP1 antibodies, consider the following methodological approach:
Tissue preparation and processing:
Antigen retrieval:
Heat-induced epitope retrieval (HIER) in citrate buffer (pH 6.0) or EDTA buffer (pH 9.0)
Optimization may be required depending on tissue fixation conditions
Staining protocol:
Controls and validation:
Interpretation of results:
Assess staining pattern (nuclear, cytoplasmic, membranous)
Evaluate staining intensity (negative, weak, moderate, strong)
Document heterogeneity across different tissue regions
Compare normal versus pathological tissue sections
When analyzing results, remember that FUBP1 expression patterns may vary depending on tissue type and disease state. The expression pattern should be consistent with literature findings, particularly in cancer tissues where aberrant expression has been documented .
When designing co-localization studies to investigate FUBP1's interactions with other proteins or cellular structures, consider these methodological approaches:
Selection of co-staining targets:
Immunofluorescence protocol optimization:
Sequential versus simultaneous antibody incubation should be tested
Species compatibility: Ensure primary antibodies are from different host species to avoid cross-reactivity
Fluorophore selection: Choose spectrally distinct fluorophores to minimize bleed-through
Microscopy techniques:
Confocal microscopy: Essential for accurate subcellular co-localization assessment
Super-resolution microscopy: Consider for detailed analysis of molecular proximities
Z-stack acquisition: Important for three-dimensional co-localization analysis
Quantitative analysis:
Pearson's correlation coefficient or Manders' overlap coefficient for co-localization quantification
Analysis should span multiple fields and cells (n > 30) for statistical robustness
Subcellular compartmentalization must be considered in the analysis
Validation strategies:
Proximity ligation assay (PLA) to confirm direct protein-protein interactions
Co-immunoprecipitation to biochemically validate interactions observed microscopically
FUBP1 knockdown or overexpression controls to determine specificity
Remember that FUBP1's localization and interaction network may change depending on cell cycle phase, differentiation state, and pathological conditions, so appropriate controls and contextual analysis are essential .
FUBP1's emerging roles in RNA splicing and m6A methylation can be investigated using antibodies through these advanced methodological approaches:
RNA immunoprecipitation (RIP) assays:
Utilize FUBP1 antibodies to immunoprecipitate FUBP1-RNA complexes
Analyze bound RNAs by RT-PCR, RNA-seq, or m6A-seq
Compare RIP profiles between normal and FUBP1-depleted cells to identify direct targets
This approach can reveal FUBP1-dependent m6A modification sites and splicing regulatory elements
Combined CLIP-seq (Cross-linking immunoprecipitation followed by sequencing):
UV cross-linking preserves native FUBP1-RNA interactions
FUBP1 antibody immunoprecipitation enriches for FUBP1-bound RNAs
High-throughput sequencing identifies binding motifs and target transcripts
Analyze binding sites in relation to splicing junctions and m6A consensus sequences
Integrated splicing analysis workflow:
FUBP1 antibody-mediated pulldown followed by mass spectrometry to identify splicing factor partners
RNA-seq after FUBP1 knockdown/overexpression to detect global splicing changes
RT-PCR validation of specific alternative splicing events
Correlation of splicing changes with m6A modification patterns
m6A-specific investigations:
Combine FUBP1 immunoprecipitation with m6A antibody detection to assess direct involvement in methylation
Use methylated RNA immunoprecipitation (MeRIP) before and after FUBP1 depletion
Quantitative PCR or sequencing of precipitated RNAs to identify FUBP1-dependent m6A sites
These approaches can help elucidate how FUBP1 loss leads to "global changes in RNA splicing and widespread expression of aberrant driver isoforms" as reported in recent literature, potentially identifying therapeutic targets in cancers with FUBP1 alterations .
Based on the finding that FUBP1 cooperates with tumor suppressor genes like PTEN in cancer development , researchers can design experimental paradigms using FUBP1 antibodies:
Co-depletion studies in cell models:
Design single and double knockdown/knockout systems for FUBP1 and candidate tumor suppressors (PTEN, TP53, RB1, CDH1, KDM5C)
Use FUBP1 antibodies to confirm depletion and examine compensatory changes in protein levels
Assess cellular phenotypes: proliferation, invasion, differentiation, and tissue architecture
Validated in: mammary epithelial cells (MCF10F) as per literature
In vivo tumor formation assays:
Establish cells with FUBP1 depletion alone or in combination with tumor suppressor genes
Implant cells in immunocompromised mice (e.g., NOD-SCID as used in published studies)
Monitor tumor development (similar to the reported 2-week timeframe for FUBP1/PTEN-deficient cells)
Signaling pathway integration analysis:
Immunoprecipitate FUBP1 and probe for co-immunoprecipitation with tumor suppressor proteins
Use phospho-specific antibodies to examine activation states of relevant signaling pathways (PI3K/AKT for PTEN, p53 pathway)
Perform reverse co-IP with tumor suppressor antibodies to confirm interactions
Map signaling networks through proteomic approaches
RNA-level functional integration:
Compare transcriptome and splicing profiles in single versus double-depleted cells
Investigate splicing patterns of tumor suppressor gene transcripts in FUBP1-depleted cells
Examine m6A modifications on tumor suppressor mRNAs with and without FUBP1
Clinical correlation studies:
Use tissue microarrays to analyze FUBP1 and tumor suppressor protein levels across cancer samples
Perform multiplexed immunofluorescence to assess co-localization in patient samples
Correlate expression patterns with clinical outcomes and molecular subtypes
This experimental framework builds on established research showing that FUBP1/PTEN-deficient cells form angiogenic, cystic tumors with widespread inflammation and abnormal mitoses in mouse models .
FUBP1 can function as both an activator and repressor of transcription . To investigate this dual functionality, researchers can employ these methodological approaches using FUBP1 antibodies:
Chromatin immunoprecipitation (ChIP) sequencing:
Use FUBP1 antibodies to immunoprecipitate chromatin-bound FUBP1
Sequence associated DNA to identify genome-wide binding sites
Integrate with histone modification ChIP-seq (H3K27ac for active enhancers, H3K27me3 for repressed regions)
Classify FUBP1-bound regions as potentially activating or repressing based on chromatin signatures
Special focus on the far upstream element (FUSE) of c-MYC and other potential target genes
Sequential ChIP (Re-ChIP):
First immunoprecipitate with FUBP1 antibodies
Follow with second immunoprecipitation using antibodies against:
Transcriptional activators (e.g., p300, CBP)
Transcriptional repressors (e.g., HDACs, KDM1A)
Analyze enriched regions to identify where FUBP1 associates with activators versus repressors
Reporter gene assays with domain-specific manipulations:
Design reporter constructs containing FUBP1-binding elements
Co-express wild-type or domain-mutant FUBP1 (particularly focusing on the N-terminal domain thought to repress C-terminal domain activity)
Validate expression levels by Western blot using FUBP1 antibodies
Measure reporter activity to assess activation versus repression functions
Integrated proteomics approach:
Immunoprecipitate FUBP1 from different cellular contexts
Perform mass spectrometry to identify context-specific interaction partners
Classify partners as activators or repressors of transcription
Validate key interactions with co-immunoprecipitation and FUBP1 antibodies
Single-cell correlation studies:
Perform single-cell immunofluorescence for FUBP1 and target genes like c-MYC
Correlate FUBP1 levels/localization with target expression at single-cell resolution
Look for bimodal distributions suggesting context-dependent activation or repression
These approaches can help researchers understand how FUBP1 transitions between activator and repressor functions, potentially identifying therapeutic opportunities for manipulating FUBP1 activity in disease contexts .
When working with FUBP1 antibodies in Western blotting, researchers may encounter several challenges:
Molecular weight discrepancy:
Challenge: FUBP1's observed molecular weight (74 kDa) differs from calculated (68 kDa)
Solution: This discrepancy is normal and documented. The mobility is affected by post-translational modifications and protein structure
Verification: Compare with positive control lysates (K562, HeLa, Jurkat) to confirm correct band identification
Multiple bands or smearing:
Challenge: Detection of multiple bands beyond the expected 74 kDa
Potential causes: Alternative splicing variants, degradation products, or non-specific binding
Solutions:
Weak or absent signal:
Challenge: Insufficient signal despite correct procedure
Solutions:
High background:
Challenge: Non-specific background obscuring specific signal
Solutions:
More stringent washing (increase TBST washing steps to 3 x 10 minutes)
Alternative blocking agents (BSA instead of milk)
Pre-absorb antibody with non-specific proteins
Use more dilute antibody solution
Inconsistent results between experiments:
Always remember that FUBP1 may show differential expression depending on cell type, differentiation stage, and growth conditions, so contextual interpretation is essential .
When facing conflicting results across different experimental methods using FUBP1 antibodies, researchers should implement this analytical framework:
Systematic method comparison:
Document disparities between techniques (e.g., WB showing high expression but IHC showing low expression)
Create a table mapping conflicting findings across methods
Evaluate each method's strengths and limitations for FUBP1 detection
Antibody validation assessment:
Verify antibody specificity through:
FUBP1 knockdown/knockout controls
Detection of recombinant FUBP1 protein
Epitope mapping to confirm target recognition
Different antibodies may recognize distinct epitopes or isoforms of FUBP1
Biological context considerations:
Technical reconciliation approaches:
For WB vs. IHC conflicts:
WB detects denatured protein while IHC detects fixed protein in native context
Consider epitope masking in tissue sections
Try different antigen retrieval methods for IHC
For IF vs. biochemical fractionation conflicts:
Antibody accessibility issues in IF
Cross-validation with GFP-tagged FUBP1 localization
Functional validation strategies:
Move beyond descriptive to functional assays:
RNA-binding assays (RIP) to confirm FUBP1-RNA interactions
ChIP to validate chromatin association
Splicing reporter assays to confirm splicing regulatory function
Correlation with known FUBP1 functions (c-MYC regulation, splicing effects)
Remember that FUBP1's complex roles in both normal and pathological contexts may result in genuine biological variability rather than technical artifacts. True understanding may require integration of seemingly conflicting data points into a more nuanced model of FUBP1 function .
Proper controls for validating FUBP1 antibody specificity are crucial for generating reliable research data. For each experimental application, specific controls should be implemented:
Essential controls for Western blot:
Positive controls: Known FUBP1-expressing cell lines (K562, HeLa, Jurkat)
Negative controls:
FUBP1 knockdown/knockout lysates
Peptide competition (pre-incubating antibody with immunizing peptide)
Loading controls: Housekeeping proteins (β-actin, GAPDH) to normalize expression
Size verification: Molecular weight markers to confirm the 74 kDa band
Controls for immunohistochemistry/immunofluorescence:
Tissue positive controls: Human colon cancer samples have been verified
Antibody controls:
Primary antibody omission
Isotype control (non-relevant IgG)
Peptide blocking controls
Expression validation controls:
FUBP1 overexpression
FUBP1 knockdown tissues/cells
Subcellular localization controls: Nuclear counterstain (DAPI) to confirm expected nuclear localization pattern
Controls for immunoprecipitation experiments:
Input controls: Analysis of starting material before IP
Negative IP controls:
IgG control immunoprecipitation
FUBP1-depleted sample immunoprecipitation
Reciprocal IP: Verify interactions by IP with antibodies against interacting partners
Specificity controls: Competing peptide to block antibody-antigen interaction
Controls for ChIP and RIP experiments:
Quantitative validation strategies:
Correlation with mRNA levels: RT-qPCR for FUBP1 transcripts
Alternative antibodies: Use of different antibody clones recognizing distinct epitopes
Recombinant protein standards: Calibration curves with purified FUBP1
The implementation of comprehensive controls is especially important for FUBP1 due to its involvement in multiple cellular processes and potential for context-dependent functions .
FUBP1 antibodies offer valuable tools for investigating its emerging role in oncogenesis through these research approaches:
Tumor profiling and stratification:
Apply FUBP1 antibodies for immunohistochemical analysis across cancer types
Correlate expression patterns with clinical outcomes and molecular subtypes
Develop scoring systems based on expression level, subcellular localization, and heterogeneity
Focus on cancers where FUBP1 alterations co-occur with other driver mutations (PTEN, TP53, RB1, CDH1, KDM5C)
Mechanistic investigations in carcinogenesis:
Examine FUBP1's role in disrupting cellular differentiation and tissue architecture
Use antibodies to track FUBP1 expression during tumor progression in staged samples
Investigate correlation between FUBP1 loss and emergence of aberrant splice isoforms of oncogenes
Monitor changes in m6A RNA methylation patterns upon FUBP1 alteration
Therapeutic response prediction:
Evaluate FUBP1 expression before and after treatment interventions
Correlate expression with response to therapies targeting RNA processing
Investigate potential synthetic lethality between FUBP1 loss and specific therapeutic agents
Study compensatory mechanisms in resistant tumors
Liquid biopsy development:
Develop circulating tumor cell (CTC) FUBP1 detection methods
Investigate shed FUBP1 or FUBP1-regulated RNA signatures in circulation
Monitor treatment response through serial FUBP1-based liquid biopsies
Experimental therapeutic approaches:
Target synthetic lethal interactions in FUBP1-altered cancers
Develop therapies addressing aberrant splice variants resulting from FUBP1 loss
Use FUBP1 antibodies to monitor on-target effects of experimental therapeutics
Explore combination strategies targeting FUBP1 and cooperating tumor suppressors
These research directions are supported by findings that FUBP1 cooperates with tumor suppressor genes to transform mammary epithelial cells and that FUBP1/PTEN-deficient cells rapidly form tumors in mouse models, highlighting FUBP1's potential as both a biomarker and therapeutic target in cancer .
Building on emerging evidence of FUBP1's involvement in RNA processing , researchers can explore these promising directions using FUBP1 antibodies:
Global splicing landscape characterization:
Combine FUBP1 immunoprecipitation with RNA-seq and splicing-sensitive microarrays
Identify FUBP1-dependent alternative splicing events across cell types
Map splicing patterns in normal versus FUBP1-depleted conditions
Develop computational models predicting FUBP1-regulated exons based on sequence features
Mechanistic dissection of context-dependent splicing regulation:
Investigate how FUBP1 can both enhance and suppress splicing in different contexts
Use FUBP1 antibodies to isolate splicing complexes under various cellular conditions
Identify post-translational modifications of FUBP1 that may switch its activity
Examine interactions with other splicing regulators using co-immunoprecipitation
Integration of m6A methylation and splicing regulation:
Map the relationship between FUBP1-regulated m6A sites and alternative splicing events
Develop antibody-based methods to simultaneously track FUBP1 binding and m6A modification
Investigate if m6A readers/writers interact with FUBP1 in splicing regulation
Examine how FUBP1 loss affects m6A deposition near splice sites
Aberrant isoform characterization in disease states:
Identify cancer-specific splice variants arising from FUBP1 alteration
Use antibodies to detect expression of these variants at the protein level
Investigate functional consequences of these aberrant isoforms
Develop isoform-specific therapeutic strategies
Development of splicing modulators:
Screen for compounds that modify FUBP1's splicing regulatory activity
Use FUBP1 antibodies to assess compound effects on FUBP1 protein levels and localization
Develop targeted degraders or stabilizers of FUBP1
Evaluate therapeutic potential in models with FUBP1 alterations
This research direction is particularly promising as FUBP1 loss leads to "global changes in RNA splicing and widespread expression of aberrant driver isoforms," suggesting a central role in maintaining proper splicing patterns that prevent malignant transformation .
FUBP1 antibodies can serve as critical tools bridging fundamental research and clinical applications through these translational approaches:
Biomarker development pipeline:
Validate FUBP1 as a diagnostic, prognostic, or predictive biomarker across cancer types
Standardize immunohistochemical protocols for clinical implementation
Develop companion diagnostics for therapies targeting FUBP1-dependent pathways
Correlate FUBP1 expression patterns with response to RNA-processing targeting drugs
Patient stratification strategies:
Use FUBP1 antibodies to classify tumors based on expression level and localization
Identify patient subgroups likely to benefit from specific therapeutic approaches
Create integrated biomarker panels combining FUBP1 with its cooperating tumor suppressors (PTEN, TP53)
Develop algorithms predicting treatment response based on FUBP1 status
Therapeutic target verification:
Validate antibody-based detection methods for monitoring drug effects on FUBP1
Develop assays measuring downstream effects of FUBP1 modulation
Create functional readouts for FUBP1-dependent splicing events in patient samples
Establish patient-derived organoid models for testing FUBP1-targeted approaches
Clinical trial design and implementation:
Use FUBP1 antibodies for patient selection in trials targeting RNA processing
Monitor treatment-induced changes in FUBP1 expression or localization
Analyze treatment resistance mechanisms involving FUBP1 pathway alterations
Develop combination therapy strategies based on FUBP1 status
Technological translation:
Adapt research-grade antibodies for clinical diagnostic use
Develop automated staining platforms for consistent FUBP1 detection
Create multiplexed detection systems combining FUBP1 with other markers
Establish quality control standards for clinical implementation
These translational approaches align with FUBP1's emerging role as a long tail cancer driver and its involvement in fundamental RNA processing mechanisms that, when disrupted, contribute to malignant transformation through global changes in alternative splicing and m6A methylation .