AKT1 (Ab-124) Antibody

What is AKT1 and what role does phosphorylation at Serine 124 play?

AKT1 is one of three closely related serine/threonine-protein kinases (AKT1, AKT2, and AKT3) that form the AKT kinase family. AKT1 regulates numerous cellular processes including metabolism, proliferation, cell survival, growth, and angiogenesis through serine and/or threonine phosphorylation of downstream substrates . While phosphorylation at Thr308 and Ser473 are well-known for full activation of AKT1, phosphorylation at Ser124 represents an additional regulatory site with distinct effects on AKT1 function . Research indicates that the S124A mutation shifts several low AKT1 pI peaks to a higher pI, with changes more pronounced than would be predicted by loss of a single phosphorylation site, suggesting complex regulatory consequences .

What are the specifications of AKT1 (Ab-124) Antibody?

AKT1 (Ab-124) Antibody is a polyclonal antibody derived from rabbit immunization with a synthesized non-phosphopeptide from human AKT around the phosphorylation site of serine 124 (S-G-S(p)-P-S) . Key specifications include:

This antibody specifically recognizes the phosphorylated form of AKT1 at serine 124, making it valuable for studying this particular modification .

How does AKT1 (Ab-124) Antibody differ from other AKT1 antibodies?

AKT1 (Ab-124) Antibody specifically targets the phosphorylated serine 124 residue of AKT1, distinguishing it from other antibodies that may recognize:

• Total AKT1 protein (regardless of phosphorylation status)

• AKT1 phosphorylated at other sites such as Ser473 or Thr308

• Multiple AKT isoforms (AKT1/2/3)

This specificity allows researchers to selectively monitor the phosphorylation status at Ser124, which represents a less-studied but potentially important regulatory site compared to the canonical activation sites (Thr308 and Ser473) . Unlike antibodies targeting Ser473, which is required for full activation of AKT1 , the Ser124 antibody enables investigation of this unique regulatory site that may have distinct functions in AKT1 signaling.

What are optimal protocols for using AKT1 (Ab-124) Antibody in Western blotting?

For optimal Western blotting results with AKT1 (Ab-124) Antibody, follow these methodological guidelines:

• Sample Preparation:

  • Lyse cells in a buffer containing phosphatase inhibitors to preserve phosphorylation status

  • Standardize protein concentration (10-20 µg total protein recommended)

• Gel Electrophoresis and Transfer:

  • Use 10% SDS-PAGE for optimal separation around 55 kDa

  • Transfer to PVDF or nitrocellulose membrane using standard protocols

• Antibody Incubation:

  • Block in 5% non-fat dry milk in TBST for 1 hour at room temperature

  • Dilute primary antibody 1:500-1:3000 in blocking buffer

  • Incubate overnight at 4°C with gentle agitation

  • Wash 3-5 times with TBST

  • Incubate with HRP-conjugated secondary antibody (anti-rabbit)

  • Develop using ECL or similar detection system

• Controls:

  • Positive control: Insulin-stimulated cell lysates (promotes AKT phosphorylation)

  • Negative control: Phosphatase-treated lysates

  • Loading control: Total AKT1 or housekeeping protein

The recommended working dilution of 1:500-1:3000 should be optimized for specific experimental conditions .

How can specificity of AKT1 (Ab-124) Antibody be validated experimentally?

To validate the specificity of AKT1 (Ab-124) Antibody, implement these experimental approaches:

• Phosphatase Treatment:

  • Treat one aliquot of positive sample with lambda phosphatase

  • Compare antibody reactivity in treated vs. untreated samples

  • Signal should diminish in phosphatase-treated samples

• Site-Directed Mutagenesis:

  • Express wild-type AKT1 and S124A mutant in cells

  • The antibody should recognize wild-type but not the S124A mutant protein

• Phosphopeptide Competition:

  • Pre-incubate antibody with the phosphopeptide immunogen

  • This should block antibody binding in subsequent applications

• siRNA Knockdown:

  • Deplete AKT1 using specific siRNA

  • Compare antibody reactivity in control vs. knockdown samples

  • Signal should decrease in proportion to knockdown efficiency

• Comparison with Mass Spectrometry:

  • Confirm phosphorylation status using phosphoproteomics

  • Correlation between antibody results and MS data increases confidence

These validation strategies ensure experimental results accurately reflect AKT1 Ser124 phosphorylation status .

How does phosphorylation at Ser124 affect AKT1 function compared to other sites?

Current research indicates that Ser124 phosphorylation has distinct regulatory effects compared to the well-characterized Thr308 and Ser473 phosphorylation sites:

• Functional Impact:

  • While Thr308 and Ser473 phosphorylation are required for full kinase activation , Ser124 phosphorylation appears to have more complex effects on AKT1 function

  • S124A mutation causes more pronounced shifts in AKT1 pI patterns than would be predicted from a single phosphorylation site, suggesting it may influence other modifications

• Structural Implications:

  • Ser124 is located in a different domain than Thr308 (activation loop) and Ser473 (hydrophobic motif)

  • This positioning may influence protein-protein interactions or conformational changes

• Signaling Dynamics:

  • Experimental evidence suggests Ser124 phosphorylation may occur under different conditions or with different kinetics than canonical activation sites

  • This could represent a mechanism for fine-tuning AKT1 activity in specific cellular contexts

Understanding these differences requires methodical comparative studies using phospho-specific antibodies for each site along with functional readouts of AKT1 activity .

What experimental approaches can elucidate the role of Ser124 phosphorylation in cancer?

Given that AKT1 is overexpressed in most human cancers and linked to poor survival , investigating Ser124 phosphorylation in oncogenic contexts is particularly relevant:

• Patient Sample Analysis:

  • Compare Ser124 phosphorylation levels between tumor and adjacent normal tissues

  • Correlate with clinical outcomes and other molecular markers

  • Analyze alongside Thr308 and Ser473 phosphorylation to identify unique patterns

• Cancer Cell Line Studies:

  • Screen diverse cancer cell lines for variable Ser124 phosphorylation

  • Correlate with drug sensitivity profiles to identify potential therapeutic implications

  • Manipulate Ser124 phosphorylation through kinase/phosphatase modulation

• Animal Models:

  • Generate knock-in mice expressing S124A or phosphomimetic S124D/E mutations

  • Assess tumor development, progression, and metastasis in relevant cancer models

  • Evaluate response to AKT inhibitors or other targeted therapies

• Mechanistic Investigations:

  • Identify upstream kinases/phosphatases regulating Ser124 phosphorylation

  • Determine downstream signaling consequences using phosphoproteomics

  • Investigate potential crosstalk with other oncogenic pathways

• Therapeutic Applications:

  • Use AKT1 (Ab-124) Antibody to monitor treatment response to PI3K/AKT inhibitors

  • Evaluate Ser124 phosphorylation as a potential biomarker for therapy selection

These approaches could reveal whether Ser124 phosphorylation represents a novel therapeutic target or biomarker in cancer .

How can AKT1 (Ab-124) Antibody be utilized in multi-parameter signaling studies?

For complex signaling network analysis, AKT1 (Ab-124) Antibody can be integrated into multi-parameter experimental designs:

• Multiplex Western Blotting:

  • Strip and re-probe membranes for different phospho-sites (pThr308, pSer473, pSer124)

  • Use size-separated markers or different species antibodies for simultaneous detection

  • Quantify relative phosphorylation at different sites under various conditions

• Phospho-Flow Cytometry:

  • Optimize AKT1 (Ab-124) Antibody for intracellular staining

  • Combine with antibodies against other phospho-proteins

  • Analyze at single-cell resolution to detect heterogeneous responses

• Reverse Phase Protein Arrays:

  • Use for high-throughput screening of Ser124 phosphorylation across conditions

  • Include antibodies against upstream activators and downstream effectors

• Spatiotemporal Dynamics:

  • Monitor phosphorylation kinetics following stimulus

  • Compare timing of Ser124 phosphorylation with other modifications

  • Evaluate subcellular localization of phosphorylated forms

• Pathway Crosstalk Analysis:

  • Systematically inhibit various signaling pathways

  • Measure effects on Ser124 phosphorylation

  • Identify unexpected regulatory connections

This integrated approach provides a comprehensive understanding of how Ser124 phosphorylation fits within the broader signaling network .

What are common issues when using AKT1 (Ab-124) Antibody and how can they be resolved?

For optimal results, always include appropriate positive and negative controls, such as phosphatase-treated samples, to validate specificity .

How should samples be prepared to preserve AKT1 Ser124 phosphorylation?

Proper sample preparation is critical for accurately detecting AKT1 Ser124 phosphorylation:

• Cell Harvesting:

  • Work quickly to minimize phosphorylation changes

  • For adherent cells, consider direct lysis in the plate

  • For suspension cells, pellet by gentle centrifugation

• Lysis Buffer Composition:

  • Use a buffer containing:

    • 50 mM Tris-HCl (pH 7.5)

    • 150 mM NaCl

    • 1% NP-40 or Triton X-100

    • 1 mM EDTA

    • 1 mM EGTA

    • Phosphatase inhibitors (critical): 10 mM NaF, 1 mM Na₃VO₄, 10 mM β-glycerophosphate

    • Protease inhibitor cocktail

• Processing Conditions:

  • Maintain samples at 4°C throughout processing

  • Sonicate briefly to disrupt complexes if necessary

  • Centrifuge at high speed (14,000 × g, 10 min, 4°C) to remove debris

  • Determine protein concentration (BCA or Bradford assay)

  • Add Laemmli buffer and heat at 95°C for 5 min

• Storage Considerations:

  • For short-term: store lysates at -20°C

  • For long-term: aliquot and store at -80°C

  • Avoid repeated freeze-thaw cycles

• Positive Controls:

  • Consider using insulin-stimulated samples which activate AKT signaling

Following these protocols minimizes phosphorylation loss and ensures reliable detection of Ser124 phosphorylation status.

What are emerging applications for studying AKT1 Ser124 phosphorylation in disease models?

The study of AKT1 Ser124 phosphorylation holds promise for several emerging research areas:

• Neurodegenerative Disorders:

  • Investigate Ser124 phosphorylation in models of Alzheimer's and Parkinson's diseases

  • Examine potential neuroprotective roles distinct from canonical AKT activation

  • Explore connections to insulin resistance in the brain

• Metabolic Syndrome and Diabetes:

  • Analyze Ser124 phosphorylation in insulin-responsive tissues

  • Compare with other AKT phosphorylation sites in insulin-resistant states

  • Evaluate as a potential biomarker for early metabolic dysfunction

• Immunological Applications:

  • Study the role of Ser124 phosphorylation in T-cell activation and differentiation

  • Investigate implications for autoimmune conditions

  • Explore potential in immunotherapy response prediction

• Cardiac Research:

  • Examine changes in Ser124 phosphorylation during cardiac stress

  • Compare with established cardioprotective AKT signaling mechanisms

  • Evaluate as a target for cardioprotection strategies

• Developmental Biology:

  • Track Ser124 phosphorylation during embryonic development

  • Compare with other AKT phosphorylation sites in stem cell differentiation

  • Investigate potential roles in tissue patterning and organogenesis

These emerging applications could reveal novel functions of AKT1 Ser124 phosphorylation beyond its established role in cancer biology .

How might advances in research tools enhance understanding of AKT1 Ser124 phosphorylation?

Technological innovations are creating new opportunities for studying AKT1 Ser124 phosphorylation:

• CRISPR/Cas9 Gene Editing:

  • Generate precise S124A or S124D knock-in cell lines and animal models

  • Create AKT1 isoform-specific knockout models to eliminate compensation

  • Develop reporter systems linked to Ser124 phosphorylation status

• Advanced Imaging Techniques:

  • Develop FRET-based biosensors specific for Ser124 phosphorylation

  • Apply super-resolution microscopy to visualize subcellular localization

  • Utilize live-cell imaging to track phosphorylation dynamics in real-time

• Single-Cell Analysis:

  • Apply mass cytometry (CyTOF) for multi-parameter signaling analysis

  • Implement single-cell phosphoproteomics to detect cellular heterogeneity

  • Correlate with single-cell transcriptomics to identify regulatory networks

• Structural Biology Approaches:

  • Determine crystal structures of AKT1 with Ser124 phosphorylation

  • Use cryo-EM to visualize conformational changes induced by Ser124 phosphorylation

  • Apply hydrogen-deuterium exchange mass spectrometry to study dynamic structural effects

• Computational Methods:

  • Deploy machine learning to predict contexts where Ser124 phosphorylation is critical

  • Model interaction networks influenced by Ser124 phosphorylation

  • Integrate multi-omics data to build comprehensive signaling maps

These technological advances promise to reveal nuanced aspects of AKT1 Ser124 phosphorylation biology that current approaches cannot address .