Phosphorylation at S94 is part of a broader network of post-translational modifications (PTMs) that regulate AR activity. The N-terminal domain, where S94 is located, contains multiple phosphosites (e.g., S81, S256, Y363) that are dynamically regulated by kinases such as CDK1 and CDK9 .
| Phosphosite | Domain | Kinase | Biological Role |
|---|---|---|---|
| S94 | N-terminal | CDK1/CDK9 | Transcriptional activation |
| S81 | N-terminal | CDK1 | Protein stability |
| S650 | Hinge | PP1 | Nuclear localization |
The antibody is typically generated using synthetic phosphopeptides corresponding to the AR S94 sequence. Key steps in its development include:
Peptide Design: A 15-mer peptide containing phosphorylated S94 is conjugated to a carrier protein (e.g., KLH or BSA) for immunization .
Affinity Purification: Polyclonal or monoclonal antibodies are purified to ensure specificity for phosphorylated S94 .
Validation: Western blotting and immunoprecipitation confirm the antibody’s ability to distinguish phosphorylated AR from unmodified forms .
The antibody is optimized for use in:
Western Blotting: Detects phosphorylated AR in lysates from prostate cancer cells (e.g., LNCaP) .
Immunohistochemistry: Identifies S94 phosphorylation in tumor tissues, aiding in stratifying patients for targeted therapies .
Mechanistic Studies: The role of S94 phosphorylation in AR dimerization or chromatin binding remains unexplored.
Cancer Biomarker Potential: Large-scale clinical studies are needed to validate S94 as a predictive marker for androgen deprivation therapy response.