Abstract
EUKARYOTIC cells respond to different extracellular stimuli by recruiting homologous signalling pathways that use members of the MEKK, MEK and ERK families of protein kinases. The MEKK→ MEK→ ERK core pathways of Saccharomyces cere-visiae may themselves be regulated by members of the STE20 family of protein kinases1,2. Here we report specific activation of the mammalian stress-activated protein kinase (SAPK) pathway by germinal centre kinase (GCK; ref. 3), a human STE20 homologue3,4. SAPKs, members of the ERK family, are activated in situ by inflammatory stimuli, including tumour-necrosis factor (TNF) and interleukin-1, and phosphorylate and probably stimulate the transactivation function of c-Jun5-7. Although GCK is found in many tissues, its expression in lymphoid follicles is restricted to the cells of the germinal centre, where it may participate in B-cell differentiation3. Activation of the SAPK pathway by GCK illustrates further the striking conservation of eukaryotic signalling mechanisms and defines the first physiological function of a mammalian Ste20.
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Pombo, C., Kehrl, J., Sánchez, I. et al. Activation of the SAPK pathway by the human STE20 homologue germinal centre kinase. Nature 377, 750–754 (1995). https://doi.org/10.1038/377750a0
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DOI: https://doi.org/10.1038/377750a0
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