Sequence specificity in recognition of the epidermal growth factor receptor by protein tyrosine phosphatase 1B

Kim L. Milarski, Guochang Zhu, Cathryn G. Pearl, Dennis J. McNamara, Ellen M. Dobrusin, Derek MacLean, Andrea Thieme-Sefler, Zhong-Yin Zhang, Tomi Sawyer, Stuart J. Decker, Jack E. Dixon, Alan R. Saltiel

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

Protein tyrosine phosphatases all contain a conserved cysteine that forms an intermediate thiophosphate ester bond during tyrosine phosphate hydrolysis. A bacterial glutathione S-transferase fusion protein containing rat brain phosphatase PTP1b was constructed in which this conserved cysteine was mutated to serine. The resulting catalytically inactive enzyme was labeled in vivo to high specific activity with 35S, and the binding of this labeled fusion protein to the immunoprecipitated epidermal growth factor (EGF) receptor was evaluated. The binding was ligand-dependent, and saturation analysis revealed a nonlinear Scatchard plot, with a Kd for high affinity binding of approximately 100 nM. A number of glutathione S-transferase fusion proteins containing src homology 2 (SH2) domains attenuated phosphatase binding in a concentration-dependent manner. Phospholipase C (PLC)γ and the GTPase-activating protein of ras were the most potent inhibitors. Tyrosine-phosphorylated EGF receptor peptide fragments were evaluated for specific inhibition of PTP1b and PLCγ SH2 binding to the activated receptor. One such peptide, modeled on EGF receptor tyrosine 992, blocked the binding of both fusion proteins. Another phosphopeptide, modeled on tyrosine 1148, inhibited the binding of PTP1b but not the PLCγ fusion protein. This site specificity was confirmed by analysis of equilibrium binding of the fusion proteins to EGF receptors mutated in each of these phosphorylation sites. The results revealed clear sequence specificity in the binding of proteins involved in the regulation of intracellular signaling by receptor tyrosine kinases.

Original languageEnglish (US)
Pages (from-to)23634-23639
Number of pages6
JournalJournal of Biological Chemistry
Volume268
Issue number31
StatePublished - Nov 5 1993
Externally publishedYes

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Non-Receptor Type 1 Protein Tyrosine Phosphatase
Epidermal Growth Factor Receptor
Fusion reactions
Tyrosine
Type C Phospholipases
Proteins
Glutathione Transferase
Cysteine
Carrier Proteins
Phosphoric Monoester Hydrolases
SH2 Domain-Containing Protein Tyrosine Phosphatases
ras GTPase-Activating Proteins
Phosphopeptides
Peptide Fragments
Protein Tyrosine Phosphatases
Receptor Protein-Tyrosine Kinases
Phosphorylation
Serine
Esters
Hydrolysis

ASJC Scopus subject areas

  • Biochemistry

Cite this

Milarski, K. L., Zhu, G., Pearl, C. G., McNamara, D. J., Dobrusin, E. M., MacLean, D., ... Saltiel, A. R. (1993). Sequence specificity in recognition of the epidermal growth factor receptor by protein tyrosine phosphatase 1B. Journal of Biological Chemistry, 268(31), 23634-23639.

Sequence specificity in recognition of the epidermal growth factor receptor by protein tyrosine phosphatase 1B. / Milarski, Kim L.; Zhu, Guochang; Pearl, Cathryn G.; McNamara, Dennis J.; Dobrusin, Ellen M.; MacLean, Derek; Thieme-Sefler, Andrea; Zhang, Zhong-Yin; Sawyer, Tomi; Decker, Stuart J.; Dixon, Jack E.; Saltiel, Alan R.

In: Journal of Biological Chemistry, Vol. 268, No. 31, 05.11.1993, p. 23634-23639.

Research output: Contribution to journalArticle

Milarski, KL, Zhu, G, Pearl, CG, McNamara, DJ, Dobrusin, EM, MacLean, D, Thieme-Sefler, A, Zhang, Z-Y, Sawyer, T, Decker, SJ, Dixon, JE & Saltiel, AR 1993, 'Sequence specificity in recognition of the epidermal growth factor receptor by protein tyrosine phosphatase 1B', Journal of Biological Chemistry, vol. 268, no. 31, pp. 23634-23639.
Milarski KL, Zhu G, Pearl CG, McNamara DJ, Dobrusin EM, MacLean D et al. Sequence specificity in recognition of the epidermal growth factor receptor by protein tyrosine phosphatase 1B. Journal of Biological Chemistry. 1993 Nov 5;268(31):23634-23639.
Milarski, Kim L. ; Zhu, Guochang ; Pearl, Cathryn G. ; McNamara, Dennis J. ; Dobrusin, Ellen M. ; MacLean, Derek ; Thieme-Sefler, Andrea ; Zhang, Zhong-Yin ; Sawyer, Tomi ; Decker, Stuart J. ; Dixon, Jack E. ; Saltiel, Alan R. / Sequence specificity in recognition of the epidermal growth factor receptor by protein tyrosine phosphatase 1B. In: Journal of Biological Chemistry. 1993 ; Vol. 268, No. 31. pp. 23634-23639.
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