Phospho-SHC1 (Tyr349) Antibody

What is Phospho-SHC1 (Tyr349) Antibody and what cellular target does it detect?

Phospho-SHC1 (Tyr349) Antibody is a rabbit polyclonal antibody specifically designed to detect endogenous levels of SHC1 protein only when phosphorylated at tyrosine 349 . SHC1 (also known by alternative names such as SH2 domain protein C1, SHC-transforming protein 1, SHCA, or Src homology 2 domain-containing-transforming protein C1) is a key adapter protein involved in multiple signaling pathways . The antibody is typically generated by immunizing rabbits with synthetic phosphopeptides conjugated to KLH carriers, followed by affinity purification using epitope-specific phosphopeptides .

The immunogen generally consists of a peptide sequence surrounding the phosphorylation site of tyrosine 349 (H-Q-Y(p)-Y-N) derived from human SHC1 . This critical phosphorylation site plays a significant role in signal transduction pathways affecting cell growth, differentiation, and survival mechanisms .

What are the validated applications for Phospho-SHC1 (Tyr349) Antibody?

Based on manufacturer validations, Phospho-SHC1 (Tyr349) Antibody has been confirmed effective for multiple research applications:

When designing experiments, researchers should note that optimal dilutions may vary depending on specific experimental conditions and the particular antibody formulation being used . Validation using appropriate positive and negative controls is always recommended before proceeding with full-scale experiments.

What species reactivity does Phospho-SHC1 (Tyr349) Antibody demonstrate?

The Phospho-SHC1 (Tyr349) Antibody demonstrates reactivity with multiple species, though this varies slightly between manufacturers. Most commonly:

• Human (Hu): Consistently reactive across all antibody sources

• Mouse (Ms): Confirmed reactive in most formulations

• Rat (Rt): Reactive in some but not all antibody preparations

This cross-species reactivity stems from the high conservation of the amino acid sequence surrounding the Tyr349 phosphorylation site across mammalian species . When working with species not listed above, preliminary validation is strongly recommended before proceeding with extensive experiments.

How should Phospho-SHC1 (Tyr349) Antibody be stored to maintain optimal activity?

Proper storage is critical for maintaining antibody activity and specificity. Based on manufacturer recommendations:

For long-term storage:

• Store at -20°C for optimal preservation

• Avoid repeated freeze-thaw cycles which can degrade antibody quality and performance

For short-term use:

• Store at 4°C when actively using the antibody within a short timeframe

• Return to -20°C promptly after use

Most preparations are supplied in stabilizing formulations containing:

• Phosphate buffered saline (PBS, without Mg²⁺ and Ca²⁺), pH 7.4

• 150mM NaCl

• 0.02% sodium azide (as preservative)

• 50% glycerol (as cryoprotectant)

Aliquoting the antibody upon first thaw is highly recommended to minimize freeze-thaw cycles and extend shelf life .

How can researchers validate specificity of Phospho-SHC1 (Tyr349) Antibody in experimental systems?

Validating antibody specificity is crucial for ensuring reliable experimental results. For Phospho-SHC1 (Tyr349) Antibody, the following validation approaches are recommended:

• Phosphopeptide competition assays: Pre-incubate the antibody with the phosphopeptide immunogen before application. Complete signal abolishment confirms specificity for the phosphorylated epitope . Images from Western blot analyses with 293 cells treated with EGF (200ng/ml for 30 minutes) demonstrate this approach, where the signal is blocked when the antibody is pre-absorbed with the phospho-peptide .

• Dephosphorylation controls: Treat a portion of your sample with lambda phosphatase prior to analysis. Disappearance of the signal confirms phospho-specificity.

• Stimulation/inhibition experiments: Compare samples from cells treated with known inducers of SHC1 phosphorylation (e.g., EGF, growth factors) versus untreated controls . Similarly, test samples treated with specific kinase inhibitors that should reduce phosphorylation.

• Knockout/knockdown validation: Compare signal between wild-type samples and those with SHC1 knocked down or knocked out to confirm signal specificity.

What are the optimal conditions for Western blotting applications using Phospho-SHC1 (Tyr349) Antibody?

For optimal Western blotting results with Phospho-SHC1 (Tyr349) Antibody, consider these methodological recommendations:

• Sample preparation:

  • Use fresh samples whenever possible

  • Include phosphatase inhibitors (e.g., sodium orthovanadate, sodium fluoride) in lysis buffers

  • Maintain samples at 4°C during processing to minimize dephosphorylation

• Dilution ratios:

  • Recommended working dilutions range from 1:500 to 1:2000 for Western blotting

  • Titration experiments are advised to determine optimal concentration for specific sample types

• Detection systems:

  • Both chemiluminescence and fluorescence-based systems are compatible

  • ECL-based detection systems work well with HRP-conjugated secondary antibodies

• Known positive controls:

  • EGF-stimulated 293 cells (200ng/ml for 30 minutes) show clear phosphorylation at Tyr349

  • Include both phosphorylated and non-phosphorylated controls

• Blocking conditions:

  • 5% BSA in TBST is preferred over milk-based blockers (milk contains phosphatases)

  • Incubate for at least 1 hour at room temperature or overnight at 4°C

How can researchers differentiate between phosphorylation at Tyr349 alone versus dual phosphorylation at Tyr349 and Tyr350?

Distinguishing between single-site phosphorylation (Tyr349) and dual-site phosphorylation (Tyr349+Tyr350) requires careful experimental design:

• Selection of site-specific antibodies:

  • Use Phospho-SHC1 (Tyr349) Antibody that specifically detects only Tyr349 phosphorylation

  • Compare with dual-specificity antibodies that detect SHC1 phosphorylated at both Tyr349+Tyr350

  • Run parallel Western blots with both antibodies to compare signal patterns

• Validation with phosphopeptide competition:

  • Conduct separate competition assays with:

    • Tyr349-only phosphopeptide

    • Tyr349+Tyr350 dual phosphopeptide

  • Analyze differential signal reduction to determine epitope specificity

• Phosphoproteomic analysis:

  • Mass spectrometry can provide definitive identification of phosphorylation sites

  • Compare tryptic peptides from immunoprecipitated SHC1 to distinguish single from dual phosphorylation

• Mutational analysis:

  • Generate constructs with Y349F and/or Y350F mutations

  • Analyze phosphorylation patterns using both antibody types to confirm specificity

What controls should be included when using Phospho-SHC1 (Tyr349) Antibody?

Proper experimental controls are essential for reliable interpretation of results when using Phospho-SHC1 (Tyr349) Antibody:

• Positive controls:

  • EGF-stimulated cell lysates (e.g., 293 cells treated with 200ng/ml EGF for 30 minutes)

  • Known SHC1-expressing tissues (e.g., breast cancer samples for immunohistochemistry)

  • Recombinant phosphorylated SHC1 protein (if available)

• Negative controls:

  • Untreated/unstimulated cells

  • Phosphatase-treated samples

  • SHC1 knockout/knockdown samples

• Antibody specificity controls:

  • Preincubation with blocking phosphopeptide to demonstrate specific binding

  • Preincubation with non-phosphorylated peptide (should not block signal)

  • Secondary antibody-only control

• Loading controls:

  • Total SHC1 antibody on parallel blots to normalize phospho-signal

  • Standard housekeeping proteins (e.g., GAPDH, β-actin) to ensure equal loading

How can researchers use Phospho-SHC1 (Tyr349) Antibody in cell-based ELISA techniques?

Cell-based ELISA provides quantitative measurement of SHC1 phosphorylation in intact cells. When using Phospho-SHC1 (Tyr349) Antibody in this application:

• Experimental setup:

  • Plate cells at consistent density in 96-well plates

  • Include stimulated and unstimulated conditions

  • Fix cells with paraformaldehyde (typically 4%) after treatment

  • Permeabilize with appropriate detergent (e.g., 0.1% Triton X-100)

• Antibody application:

  • Recommended dilution for ELISA is approximately 1:10000

  • Incubate with primary antibody overnight at 4°C for optimal results

  • Use HRP-conjugated secondary antibody with appropriate dilution

• Signal normalization:

  • Normalize phospho-signal to total protein content

  • Consider dual staining with total SHC1 antibody in parallel wells

  • Include cell-number normalization controls

• Data analysis:

  • Calculate fold-change in phosphorylation relative to control conditions

  • Present data as phospho-SHC1/total SHC1 ratio to account for expression differences

  • Plot dose-response or time-course data when relevant

The SHC1 Phospho-Tyr349 Colorimetric Cell-Based ELISA Kit offers a standardized approach with "exceptional sensitivity and specificity, ensuring precise and reproducible results" .

How can Phospho-SHC1 (Tyr349) Antibody contribute to cancer research?

Phospho-SHC1 (Tyr349) Antibody serves as a valuable tool in cancer research due to SHC1's critical role in signaling pathways relevant to tumor biology:

• Receptor tyrosine kinase signaling:

  • SHC1 phosphorylation at Tyr349 often occurs downstream of activated receptor tyrosine kinases

  • Immunohistochemical analysis of human breast cancer samples reveals SHC1 phosphorylation patterns

  • Western blot analysis of various cancer cell lines can identify differential SHC1 activation states

• Growth factor response profiling:

  • Monitor EGF-induced signaling in cancer cells using Phospho-SHC1 (Tyr349) Antibody

  • Quantify changes in phosphorylation following treatment with therapeutic agents

  • Analyze tumor biopsies before and after treatment

• Prognostic marker potential:

  • Elevated SHC1 phosphorylation correlates with aggressive phenotypes in some cancers

  • Immunohistochemistry using Phospho-SHC1 (Tyr349) Antibody can help stratify patient samples

  • Correlate phosphorylation status with clinical outcomes and treatment response

• Therapeutic target validation:

  • Assess inhibition of SHC1 phosphorylation following treatment with targeted therapies

  • Monitor on-target activity of drugs targeting upstream kinases

  • Identify resistance mechanisms through changes in phosphorylation patterns

What methodological considerations are important when using Phospho-SHC1 (Tyr349) Antibody in immunofluorescence studies?

When employing Phospho-SHC1 (Tyr349) Antibody for immunofluorescence applications:

• Fixation protocols:

  • Paraformaldehyde fixation (4%) for 15-20 minutes at room temperature preserves phosphoepitopes

  • Avoid methanol fixation which can cause loss of phosphorylation signal

  • Include phosphatase inhibitors in wash buffers

• Permeabilization:

  • Gentle permeabilization with 0.1-0.2% Triton X-100 for 5-10 minutes

  • Alternative: 0.1% saponin for less harsh permeabilization

• Antibody dilution:

  • Recommended dilutions range from 1:100 to 1:200 for immunofluorescence applications

  • Optimize by titration for specific cell types and experimental conditions

• Blocking conditions:

  • Block with 5% normal serum (from secondary antibody host species) and 1% BSA

  • Add 0.1% Tween-20 to reduce background

  • Block for at least 1 hour at room temperature

• Signal amplification:

  • Consider tyramide signal amplification for low abundance targets

  • Use high-sensitivity detection systems for subtle changes in phosphorylation

• Counterstaining:

  • Nuclear counterstain with DAPI or Hoechst

  • Consider co-staining with total SHC1 antibody using differently colored fluorophores

  • Include cytoskeletal markers to assess subcellular localization

How can researchers troubleshoot weak or inconsistent signals when using Phospho-SHC1 (Tyr349) Antibody?

When encountering signal problems with Phospho-SHC1 (Tyr349) Antibody, consider these methodological solutions:

• Weak or absent signal:

  • Ensure proper stimulation of cells (e.g., EGF treatment for 30 minutes)

  • Increase antibody concentration or incubation time

  • Check for phosphatase activity in buffers or samples

  • Verify storage conditions and antibody expiration date

  • Try signal enhancement systems (e.g., biotin-streptavidin amplification)

• High background:

  • Increase blocking time/concentration

  • Decrease primary antibody concentration

  • Additional washing steps with increased stringency

  • Try different blocking agents (e.g., fish gelatin instead of BSA)

  • Optimize secondary antibody dilution

• Multiple bands in Western blot:

  • SHC1 exists in multiple isoforms (p46, p52, p66) , resulting in several bands

  • Confirm molecular weights match expected SHC1 isoforms

  • Use phosphopeptide competition to identify specific bands

  • Consider running reducing vs. non-reducing conditions

• Inconsistent results between experiments:

  • Standardize cell culture conditions and passage number

  • Prepare fresh working solutions of antibody

  • Maintain consistent stimulation protocols

  • Use internal controls for normalization

  • Aliquot antibody to avoid freeze-thaw cycles

What are the considerations for using Phospho-SHC1 (Tyr349) Antibody in multiplex studies?

When incorporating Phospho-SHC1 (Tyr349) Antibody into multiplex detection systems:

• Antibody compatibility:

  • Ensure primary antibodies are from different host species to avoid cross-reactivity

  • If using multiple rabbit antibodies, consider directly conjugated primaries

  • Validate absence of cross-reactivity between detection systems

• Signal separation:

  • Choose fluorophores with minimal spectral overlap

  • Include single-stain controls for compensation/spillover correction

  • Optimize sequence of antibody application for sequential staining

• Epitope availability:

  • Consider steric hindrance when targeting closely positioned epitopes

  • Test different fixation and permeabilization conditions

  • Optimize antigen retrieval methods for tissue sections

• Quantitative considerations:

  • Account for potential fluorophore interactions or FRET effects

  • Include calibration standards for each detection channel

  • Use appropriate software for multiplex signal deconvolution