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Quantitative multiplexed profiling of cellular signaling networks using phosphotyrosine-specific DNA-tagged SH2 domains

Abstract

Deciphering global signaling networks is of great importance for the detailed understanding of cellular signaling processes controlling many important biological functions. Among signaling processes, tyrosine phosphorylation has a central role. At present, adequate techniques for the global characterization of the tyrosine phosphoproteome are lacking, particularly for the analysis of small amounts of protein. By combining the power of PCR amplification with the unique properties of Src homology region 2 (SH2) domains to specifically recognize tyrosine-phosphorylated proteins, we developed a new proteomic approach, termed oligonucleotide-tagged multiplex assay (OTM). For OTM, multiple SH2 domains are labeled by domain-specific oligonucleotide tags, applied as probes to complex protein mixtures in a multiplex reaction and phosphotyrosine-specific interactions are quantified by PCR. Using OTM we reproducibly quantified differential states of tyrosine phosphorylation with high sensitivity and specificity in small amounts of whole cellular extracts as demonstrated for various tumor cell lines and human leukemia samples.

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Figure 1: Principle of the OTM assay.
Figure 2: Evaluation of assay sensitivity, specificity and reproducibility.
Figure 3: Quantitative SH2 profiling of the human PDGFβ receptor by OTM.
Figure 4: Quantitative OTM profiles of different tumor cell lines at different states of activation.
Figure 5: Quantitative SH2 profiling of different types of human leukemia by OTM.

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Acknowledgements

This work was supported by the Erich und Gertrud Roggenbuck-Stiftung, Hamburg, Germany (to P.N). Assay development was supported by the US National Institutes of Health grant CA107785 given to B.J.M. and P.N.; J.T. was supported by the Deutsche Forschungsgemeinschaft (SFB470). The authors gratefully acknowledge the support of C. Wagener (University Medical Center Hamburg-Eppendorf). We are very thankful to A. Hansen and B. Klampe for technical assistance, U. zur Stadt and E. Groh (University Medical Center Hamburg-Eppendorf) for access and assistance with the Light Cycler Instrument and H. Pospisil (University Hamburg) for help with the statistical evaluation. We are particularly grateful to H. Sander for assistance during analysis of patient samples.

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Authors and Affiliations

Authors

Contributions

K.M., generation of SH2 probes; A.V., functional testing of SH2 probes; J.T., atomic force microscopy; M.H., data analyses and statistical evaluation; W.F., investigations on clinical samples; B.J.M., assay development and evaluation.

Corresponding author

Correspondence to Peter Nollau.

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The authors declare no competing financial interests.

Supplementary information

Supplementary Fig. 1

Comparable efficiency of PCR amplification of the five oligonucleotide tags. (PDF 132 kb)

Supplementary Fig. 2

Validation of PCR-ELISA. (PDF 75 kb)

Supplementary Fig. 3

Characterization of OTM probes. (PDF 682 kb)

Supplementary Fig. 4

Confirmation of results of PCR-ELISA by quantitative real-time PCR. (PDF 137 kb)

Supplementary Table 1

List of oligonucleotides. (PDF 34 kb)

Supplementary Table 2

Patient characteristics. (PDF 34 kb)

Supplementary Data

Statistical evaluation of OTM data. (PDF 70 kb)

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Dierck, K., Machida, K., Voigt, A. et al. Quantitative multiplexed profiling of cellular signaling networks using phosphotyrosine-specific DNA-tagged SH2 domains. Nat Methods 3, 737–744 (2006). https://doi.org/10.1038/nmeth917

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