RGD1 Antibody

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Description

RGD1 in Biomedical Context

The RGD motif is a tripeptide sequence recognized by integrins, cell-surface receptors involved in adhesion and signaling. "RGD1" specifically refers to engineered constructs incorporating this motif to enhance targeting. Two prominent examples include:

  • rAAV5-RGD1: A recombinant adeno-associated virus modified with an RGD motif to improve gene delivery to integrin-expressing cells .

  • RGD1-melittin: A bifunctional peptide combining melittin (a cytotoxic component of bee venom) with an RGD motif for selective cancer targeting .

rAAV5-RGD1

  • Design: The wild-type AAV5 capsid was modified to display an RGD motif, enabling integrin binding while retaining its native sialic acid receptor interaction .

  • Mechanism:

    • Targets αvβ3/αvβ6 integrins overexpressed on cancer cells (e.g., glioblastoma U87-MG, hepatocellular carcinoma SK-Hep1).

    • Gene transfer efficiency was 10–100× higher than unmodified AAV5 in integrin-positive cells, validated via RGDS peptide competition assays .

RGD1-Melittin

  • Design: A fusion peptide with an N-terminal RGD motif (HGRGDLGRLKK) linked to melittin .

  • Mechanism:

    • Binds αvβ3/αvβ6 integrins on triple-negative breast cancer (TNBC) cells.

    • Induces apoptosis with an IC50 of 4.5 µM in SUM159 TNBC cells, while sparing normal fibroblasts (IC50 ratio: 2.73 vs. 1.76 for wild-type melittin) .

Gene Therapy Applications (rAAV5-RGD1)

ParameterrAAV5-RGD1 vs. Wild-Type rAAV5
Transduction Efficiency5,000–10,000× lower MOI required for equivalent GFP expression
SelectivityRGDS peptide reduced transduction by 70–90% in integrin-positive cells
Therapeutic UtilityEnhanced tumor-selective delivery of suicide genes (e.g., HSV-TK)

Anticancer Activity (RGD1-Melittin)

ParameterRGD1-Melittin vs. Melittin
CytotoxicityComparable IC50 in TNBC cells (~4.5 µM)
Selectivity55% higher therapeutic window (HDFa/SUM159 ratio: 2.73 vs. 1.76)
Apoptosis Induction3.5× more Annexin V+ cells at 24 hours

Therapeutic Applications

  • Oncolytic Gene Therapy: rAAV5-RGD1 enables tumor-specific delivery of cytotoxic genes, minimizing off-target effects .

  • Targeted Chemotherapy: RGD1-melittin’s integrin specificity reduces systemic toxicity, making it viable for TNBC and glioblastoma .

Challenges and Future Directions

  • Immunogenicity: RGD-modified constructs may trigger anti-capsid or anti-peptide immune responses, requiring humanized designs .

  • Delivery Optimization: Improving the pharmacokinetics of RGD1-melittin for in vivo efficacy remains a priority .

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
Made-to-order (14-16 weeks)
Synonyms
RGD1 antibody; YBR260C antibody; YBR1728 antibody; RHO GTPase-activating protein RGD1 antibody; RhoGAP antibody; Related GAP domain protein 1 antibody
Target Names
RGD1
Uniprot No.

Target Background

Function
RGD1 is a GTPase activating protein (GAP) for the Rho-family GTPases RHO3 and RHO4. It functions in conjunction with MID2 to maintain cell integrity, a process linked to the protein kinase C (PKC) pathway. RGD1 participates in various stress responses and is required at low pH for the activation of the PKC pathway. It plays a critical role during the mating response.
Gene References Into Functions
  1. Studies have demonstrated that Rgd1p is phosphorylated by the Aurora B-like kinase Ipl1, and the loss of Ipl1 function results in an altered Rgd1p distribution in a subset of cells. PMID: 23454383
  2. Rgd1p colocalizes with a portion of the post-Golgi marker Sec2p and is transported to the bud tip. PMID: 22447923
  3. Researchers propose that Tos2p, a protein involved in polarized growth and likely associated with the plasma membrane, modulates the activity of Rgd1p and Rho3p in Saccharomyces cerevisiae. PMID: 21143383
  4. The first evidence for a specific interaction between a RhoGAP domain (the RhoGAP domain of Rgd1p) and phosphoinositides was presented. PMID: 21215255
  5. The rgd1Delta strain exhibits sensitivity to low pH, and Rgd1p activates the PKC pathway in an acidic environment. PMID: 16087742
  6. Phosphoinositides regulate the recruitment and trafficking of Rgd1p to membranes via its F-BAR domain and specifically stimulate its GTPase-activating protein activity. PMID: 18845541

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Database Links

KEGG: sce:YBR260C

STRING: 4932.YBR260C

Subcellular Location
Cytoplasm. Note=Bud and bud neck. During isotropic bud growth in the G1 and S phases, detected at the bud tip. During cytokinesis, undetectable at the bud tip and localized at the bud neck only.

Q&A

What is the RGD1 Antibody and what are its primary applications?

RGD1 Antibody is a primary antibody available for research applications. While specific application data in the literature is limited, primary antibodies of this type are typically used in techniques like Western blotting, ELISA, and immunohistochemistry. The antibody belongs to the same product family as other research antibodies such as those targeting C1ra . When employing RGD1 Antibody in your research, follow standard validation protocols to confirm specificity before conducting critical experiments. This includes using appropriate positive and negative controls, comparing results across multiple detection methods, and verifying expected molecular weight in Western blot applications.

How should researchers validate RGD1 Antibody specificity before conducting experiments?

Antibody validation is critical for ensuring experimental reliability. For RGD1 Antibody, implement a multi-step validation process:

  • Western blot analysis to confirm the detection of a protein with the appropriate molecular weight

  • Include positive control samples known to express the target protein

  • Test negative control samples known not to express the target

  • Perform peptide competition assays to demonstrate binding specificity

  • Compare staining patterns with published literature or orthogonal methods

This validation approach mirrors standard practices used for other well-characterized antibodies such as those targeting RGMb, where specificity is critical for accurate experimental outcomes .

What is the difference between polyclonal and monoclonal versions of research antibodies?

The distinction between polyclonal and monoclonal antibodies significantly impacts experimental design and data interpretation:

FeaturePolyclonal AntibodiesMonoclonal Antibodies
SourceMultiple B-cell clonesSingle B-cell clone
Epitope recognitionMultiple epitopesSingle epitope
Batch-to-batch variationHigherLower
CostGenerally lowerGenerally higher
ApplicationsBroader detection rangeHigher specificity

Similar to antibodies like those against C1ra (which is available in polyclonal format) , the format of RGD1 Antibody would determine its application strengths. Polyclonal antibodies provide robust detection across various applications but may show higher background, while monoclonals offer superior specificity but might be more sensitive to epitope modifications.

What storage and handling practices maximize antibody performance and longevity?

Proper storage of research antibodies like RGD1 is essential for maintaining functionality:

  • Store antibody aliquots at -20°C for long-term storage to prevent degradation

  • Avoid repeated freeze-thaw cycles by preparing working aliquots

  • For short-term use (1-2 weeks), store at 4°C with appropriate preservatives

  • Protect conjugated antibodies from light exposure

  • Monitor for signs of contamination or precipitation

These practices are consistent with handling protocols for other research antibodies in the same product family and help maintain antibody stability and performance throughout your research project.

How can researchers optimize RGD1 Antibody dilutions for different experimental applications?

Determining optimal working dilutions requires systematic titration experiments:

  • Start with the manufacturer's recommended range (typically 1:100 to 1:1000 for primary antibodies)

  • Perform serial dilutions on standardized samples for each application (Western blot, IHC, ELISA)

  • Analyze signal-to-noise ratio at each dilution point

  • Document optimal conditions for each application and batch

A methodical approach to antibody titration, similar to that used with other research antibodies like monoclonal antibodies targeting RGMb (where optimal concentrations were determined to achieve high-affinity binding of 0.72-1.4 nM) , ensures both specificity and sensitivity while conserving valuable reagents.

What methodological considerations apply when using primary antibodies in chromatin immunoprecipitation (ChIP)?

Successful ChIP experiments with primary antibodies require specific methodological considerations:

  • Verify that the antibody recognizes native conformations of the target protein

  • Optimize crosslinking conditions to preserve protein-DNA interactions without masking epitopes

  • Determine appropriate antibody-to-chromatin ratios through titration experiments

  • Include appropriate controls (IgG control, input chromatin)

  • Validate enriched regions using qPCR before proceeding to sequencing

This approach parallels methods used with other well-characterized antibodies in epigenetic research, where epitope accessibility in chromatin contexts is crucial for experimental success.

How do different sample preparation methods affect antibody binding and experimental outcomes?

Sample preparation significantly impacts antibody-epitope interactions:

Preparation MethodAdvantagesPotential Limitations
RIPA lysisEfficient protein extractionMay denature some epitopes
Non-denaturing lysisPreserves protein complexesLess efficient extraction
Formalin fixationExcellent morphology preservationRequires antigen retrieval
Frozen sectionsBetter epitope preservationPoorer morphology

When working with RGD1 Antibody, researchers should systematically compare different preparation methods to determine which best preserves the target epitope while maintaining experimental compatibility. This systematic approach is similar to optimization strategies employed for antibodies like RG1, where epitope accessibility was found to be critical for binding .

What are the key considerations for multiplexed immunofluorescence using primary antibodies like RGD1?

Multiplexed immunofluorescence requires careful experimental design:

  • Select antibodies raised in different host species or use isotype-specific secondaries

  • Validate each antibody individually before combining into multiplex panels

  • Test for potential cross-reactivity between detection systems

  • Establish appropriate spectral compensation controls

  • Consider sequential staining protocols for closely related targets

  • Implement appropriate blocking to minimize background

These methodological approaches minimize false co-localization signals and ensure reliable multiplex data interpretation, similar to techniques used in complex immunophenotyping studies.

What controls are essential when publishing research using antibody-based detection methods?

Rigorous controls are fundamental to antibody-based research:

  • Positive controls: Samples known to express the target protein at varying levels

  • Negative controls: Samples known not to express the target protein

  • Technical controls:

    • No primary antibody control (secondary antibody only)

    • Isotype control (matched to primary antibody class and species)

    • Peptide competition assay

  • Quantification controls: Standard curves for quantitative applications

  • Reproducibility controls: Technical and biological replicates

Implementation of these controls aligns with best practices in antibody-based research and enhances data reliability and reproducibility, following similar protocols used with well-characterized antibodies in published literature .

How can researchers address non-specific binding issues with primary antibodies?

Non-specific binding can be systematically addressed through methodological refinements:

  • Optimize blocking conditions:

    • Test different blocking agents (BSA, normal serum, commercial blockers)

    • Match blocking species to secondary antibody host

    • Adjust blocking concentration and duration

  • Increase washing stringency:

    • Extend washing duration

    • Add low concentrations of detergents to wash buffers

    • Increase number of wash steps

  • Adjust antibody concentrations:

    • Further titrate primary antibody

    • Reduce secondary antibody concentration

  • Consider pre-adsorption with irrelevant tissues

These approaches follow standard troubleshooting protocols used with research antibodies to enhance specificity while maintaining sensitivity.

What approaches can improve signal detection when working with low-abundance targets?

Detection of low-abundance proteins requires methodological refinement:

  • Implement signal amplification systems:

    • Tyramide signal amplification

    • Polymer-based detection systems

    • Biotin-streptavidin amplification

  • Optimize antibody incubation conditions:

    • Extended incubation times (overnight at 4°C)

    • Optimize incubation buffer composition

  • Concentrate target proteins:

    • Immunoprecipitation before detection

    • Subcellular fractionation to enrich target compartments

  • Employ more sensitive detection methods:

    • Enhanced chemiluminescence for Western blots

    • Confocal microscopy with photomultiplier tubes

These approaches help reveal biologically significant signals that might otherwise go undetected, similar to sensitivity enhancement methods used with antibodies targeting low-abundance proteins.

How do fixation and permeabilization protocols affect epitope recognition in immunohistochemistry?

Different fixation methods significantly impact epitope preservation and accessibility:

Fixation MethodAdvantagesPotential Limitations
Paraformaldehyde (4%)Preserves cellular architectureMay mask some epitopes
Acetone/MethanolBetter for some internal epitopesPoorer morphology preservation
GlutaraldehydeExcellent ultrastructure preservationSignificant epitope masking
Heat-mediated fixationRapidVariable results by tissue type

For optimal results with RGD1 Antibody, researchers should:

  • Compare multiple fixation methods on standardized samples

  • Test different permeabilization agents (Triton X-100, saponin, digitonin)

  • Consider antigen retrieval methods for formalin-fixed tissues

  • Document optimal conditions for each sample type

This systematic approach ensures maximum signal while preserving cellular architecture, similar to optimization protocols for other research antibodies where epitope accessibility is critical .

How should researchers interpret conflicting results between antibody-based detection and other methods?

When faced with discrepancies between antibody-based results and alternative methods:

  • Re-evaluate antibody specificity in the specific experimental context

  • Consider post-translational modifications that might affect epitope recognition

  • Examine whether differences in sample preparation affect target detection

  • Use alternative antibody clones targeting different epitopes

  • Implement orthogonal, antibody-independent methods to resolve conflicts

What statistical approaches are appropriate for quantifying immunohistochemistry or immunoblotting results?

Robust quantification requires appropriate statistical methodology:

Analysis TypeAppropriate Statistical ApproachesSample Size Considerations
DAB IHC QuantificationH-score, Allred scoring, digital image analysisMinimum 3-5 fields per sample
Fluorescence IntensityIntegrated density, mean fluorescence intensityControl for exposure and background
Western Blot DensitometryNormalized band intensity, relative quantificationInclude loading controls
ELISAStandard curve interpolation, four-parameter logistic regressionTechnical duplicates/triplicates

For all quantitative analyses, researchers should:

  • Determine appropriate sample sizes through power analysis

  • Account for technical and biological replicates

  • Apply suitable normalization methods

  • Select statistical tests based on data distribution

  • Consider multiple comparison corrections for complex datasets

These approaches help distinguish biologically meaningful differences from experimental variation, enhancing the rigor of antibody-based research.

How can researchers distinguish between true positives and false positives in antibody-based assays?

Distinguishing genuine signals from artifacts requires rigorous controls:

  • Include competition controls with excess target peptide/protein

  • Confirm signal reduction in knockdown/knockout models

  • Verify expected subcellular localization

  • Compare staining patterns with published literature and other detection methods

  • Examine signal across multiple tissues with known expression profiles

These methodological controls, similar to those used with other well-characterized antibodies like RG1 , help differentiate between specific immunoreactivity and technical artifacts, strengthening the validity of experimental observations.

What are the common causes of batch-to-batch variation in antibody performance and how can they be addressed?

Antibody batch variation can significantly impact experimental reproducibility:

  • Sources of variation:

    • Changes in manufacturing processes

    • Different production lots

    • Storage and handling differences

    • Lot-specific contaminants

  • Mitigation strategies:

    • Purchase larger lots for long-term projects

    • Re-validate each new antibody lot against previous lots

    • Maintain detailed records of lot numbers and performance

    • Include internal reference standards across experiments

    • Consider developing customized validation protocols for critical antibodies

These approaches enhance experimental consistency and reliability across studies, following best practices in antibody research.

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