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. 1992 Sep 1;89(17):8200–8204. doi: 10.1073/pnas.89.17.8200

Phorbol ester stimulates a protein-tyrosine/threonine kinase that phosphorylates and activates the Erk-1 gene product.

A Alessandrini 1, C M Crews 1, R L Erikson 1
PMCID: PMC49885  PMID: 1518847

Abstract

The regulation of the Erk (extracellular-signal-regulated kinase) gene-encoded protein kinase activity by reversible phosphorylation has been reported to involve either an activator of autophosphorylation or an upstream protein kinase. In this communication we describe assays utilizing the Erk-1 protein fused to glutathione S-transferase that permit the identification of protein kinase(s) that phosphorylate and activate the myelin basic protein kinase activity encoded by the Erk-1 gene. A phorbol ester-stimulated protein kinase activity was identified that phosphorylated a kinase-negative Erk-1 gene product on tyrosine and threonine. The protein kinase phosphorylated and activated wild-type protein expressed in bacteria from 20- to 50-fold. The activation of the Erk-1-encoded myelin basic protein kinase required ATP and correlated directly with the degree of phosphorylation on the same amino acid residues previously shown to be phosphorylated in vivo. Conversion of the tyrosine site of phosphorylation to phenylalanine yielded an Erk-1 gene product that could not be activated. Similar results were obtained when the threonine site was mutated to valine. It is likely that the phorbol ester-stimulated protein-tyrosine/threonine kinase(s) is an up-stream target for multiple extracellular signals.

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Selected References

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