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. 1992 Nov 1;89(21):10435–10439. doi: 10.1073/pnas.89.21.10435

Synthetic phosphopeptide immunogens yield activation-specific antibodies to the c-erbB-2 receptor.

R J Epstein 1, B J Druker 1, T M Roberts 1, C D Stiles 1
PMCID: PMC50353  PMID: 1359539

Abstract

We inoculated rabbits with synthetic phosphopeptides, duplicating a major autophosphorylation site of the c-erbB-2 protooncogene product. The rabbits produced antisera that, after reverse immunoaffinity purification, selectively recognize the erbB-2 protein in its enzymatically active configuration. These anti-phosphopeptide antisera identify a subset of erbB-2-positive human cell lines wherein the protein is constitutively active as a tyrosine kinase. Synthetic phosphopeptides incorporating informative protein phosphorylation sites may prove useful for generating antibodies that indicate the activation state of additional tyrosine kinases and perhaps other proteins phosphorylated on serine and threonine residues.

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