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Updated: Feb 6, 2026
Author Spotlight: Developing Tools to Tune the Activity of Tyrosine Phosphatases
Published on: September 6, 2024
Development of novel affinity reagents for detecting protein tyrosine phosphorylation based on superbinder SH2 domain
Ai-Qing Ke1, An-Dong Liu1, Ya-Nan Gao1
1Department of Medical Genetics, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
Abstract:
Tyrosine phosphorylation, as a hallmark in cellular signal transduction, is important for a diverse array of cellular processes, such as proliferation, metabolism, motility, and survival. Aberrant tyrosine phosphorylation plays a causal role in many diseases, especially the cancer. Detecting protein phosphorylation status in the cancer cells or tissues is vital for assessing the pathological phase, discovering the cancer biomarkers, and identifying the drug targets. However, the common biochemical detection methods remain through anti-pTyr antibodies, which are known to have limited sensitivity, poor reproducibility and high cost. Recent studies have proved that superbinder SH2 domain is a good replacement of anti-pTyr antibodies for the specific enrichment of pTyr peptides in phosphoproteomics analysis. In this work, we exploited a series of affinity reagents based on superbinder SH2 derived from Src protein for detecting the pTyr-containing proteins to replace anti-pY antibodies in immunoblotting and immunofluorescence techniques. The excellent performance of HRP-sSH2 and EGFP-sSH2 was verified by the analysis of several different tumor cell samples and was compared with most commonly used commercial antibodies. EGFP-sSH2-(Arg)9 might be applied as the probe for direct fluorescence imaging in live cells via efficiently penetrating cell membranes and specifically binding with pTyr proteins. In summary, we have developed three novel, convenient, sensitive, and cost-effective affinity reagents that would have wide applications in protein tyrosine phosphorylation analysis for the tumor research and clinical diagnosis.
Insights
Researchers developed novel affinity reagents using superbinder SH2 domains to detect protein tyrosine phosphorylation, offering a sensitive and cost-effective alternative to traditional antibodies for cancer research and diagnosis.
Area of Science:
- Biochemistry and Molecular Biology
- Cellular Signaling and Cancer Research
Background:
- Tyrosine phosphorylation is crucial for cellular processes, and its dysregulation is linked to cancer.
- Current methods for detecting tyrosine phosphorylation, primarily using anti-pTyr antibodies, suffer from limitations in sensitivity, reproducibility, and cost.
- The SH2 domain of the Src protein shows promise as a specific binder for phosphotyrosine (pTyr) peptides.
Purpose of the Study:
- To develop novel affinity reagents based on superbinder SH2 domains for detecting pTyr-containing proteins.
- To replace conventional anti-pTyr antibodies in immunoblotting and immunofluorescence techniques.
- To provide sensitive, cost-effective, and convenient tools for analyzing protein tyrosine phosphorylation in tumor research and clinical diagnosis.
Main Methods:
- Exploited a series of affinity reagents based on superbinder SH2 derived from Src protein.
- Tested HRP-sSH2 and EGFP-sSH2 reagents in immunoblotting and immunofluorescence assays.
- Analyzed tumor cell samples and compared performance with commercial antibodies.
Main Results:
- Developed three novel affinity reagents (HRP-sSH2, EGFP-sSH2, EGFP-sSH2-(Arg)9) for pTyr detection.
- Demonstrated excellent performance of HRP-sSH2 and EGFP-sSH2 in analyzing tumor cell samples, comparable to commercial antibodies.
- Showcased potential of EGFP-sSH2-(Arg)9 for direct fluorescence imaging in live cells due to cell membrane penetration and specific pTyr binding.
Conclusions:
- Novel superbinder SH2-based affinity reagents offer a sensitive, convenient, and cost-effective alternative to anti-pTyr antibodies.
- These reagents have broad applications in protein tyrosine phosphorylation analysis for cancer research and clinical diagnosis.
- EGFP-sSH2-(Arg)9 shows promise for live-cell imaging of pTyr proteins.
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