Interleukin 1 alpha activates two forms of p54 alpha mitogen-activated protein kinase in rabbit liver

doi:10.1084/jem.180.6.2017

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Interleukin 1 alpha activates two forms of p54 alpha mitogen-activated protein kinase in rabbit liver

M Kracht, O Truong, NF Totty, M Shiroo and J Saklatvala
Cytokine Laboratory, Department of Development and Signalling, Babraham Institute, Cambridge, UK.

We have identified in rabbits two hepatic forms of T669 peptide kinases that are very strongly activated after systemic injection with the inflammatory cytokine interleukin 1 (IL-1). The T669 peptide contains a major phosphorylation site of the epidermal growth factor receptor, threonine 699 and is a substrate for mitogen-activated protein (MAP) kinases. The kinases were purified to homogeneity and corresponded to 50- and 55-kD proteins on sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Amino acid sequencing of 12 tryptic peptides of both kinases identified them as p54 MAP kinase alpha. This kinase belongs to the novel family of stress-activated protein kinases. This is the first evidence of IL-1 activating a specific protein kinase in vivo.
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