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. 1988 Dec 15;256(3):1029–1034. doi: 10.1042/bj2561029

Conversion of a phosphoseryl/threonyl phosphatase into a phosphotyrosyl phosphatase.

J Goris 1, C J Pallen 1, P J Parker 1, J Hermann 1, M D Waterfield 1, W Merlevede 1
PMCID: PMC1135519  PMID: 2852001

Abstract

By use of the autophosphorylated epidermal-growth-factor receptor and the synthetic peptide RRLIE-DAEY(P)AARG, representing an autophosphorylation site of the transforming protein of Rous-sarcoma virus, it is demonstrated that the phosphotyrosyl phosphatase activity of the polycation-stimulated phosphatases is substantially increased by an enzyme-directed effect of ATP or PPi. Concomitant with this increase in phosphotyrosyl phosphatase activity, the phosphorylase phosphatase activity is decreased, thus dramatically changing the substrate specificity of these enzymes. The dephosphorylation of four different phosphotyrosyl sites of the epidermal-growth-factor receptor is neither consecutive nor at random, but a preferred dephosphorylation of the P1 site over the P3 greater than P2 greater than P4 sites is observed. This phosphatase activity represents a substantial fraction of the total phosphotyrosyl phosphatase activity in the post-mitochondrial supernatant of Xenopus laevis oocytes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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