A mitogen-activated protein (MAP) kinase activating factor in mammalian mitogen-stimulated cells is homologous to Xenopus M phase MAP kinase activator

Kyoko Shirakabe, Yukiko Gotoh, Eisuke Nishida

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Abstract

The mitogen-activated protein (MAP) kinases, a family of 40-45-kDa kinases whose activation requires both tyrosine and threonine/serine phosphorylations, are suggested to play key roles in various phosphorylation cascades. A previous study of Krebs and co-workers (Ahn, N. G., Seger, R., Bratlien, R. L., Diltz, C. D., Tonks, N. K., and Krebs, E. G. (1991) J. Biol. Chem. 266, 4220-4227) detected an activity in epidermal growth factor (EGF)-stimulated 3T3 cells that can stimulate inactive MAP kinases. We observed this activity in rat 3Y1 cells treated with various mitogenic factors and in PC12 cells treated with nerve growth factor (NGF). Its kinetics of activation and deactivation following EGF or NGF stimulation roughly paralleled that of MAP kinase. The MAP kinase activator required the presence of ATP and a divalent cation such as Mn2+ and Mg2+ and was inactivated by phosphatase 2A treatment in vitro. This activator has been isolated from EGF-stimulated 3Y1 cells by sequential chromatography and identified as a 45-kDa monomeric protein. It was able to activate mammalian and Xenopus MAP kinases in vitro and was very similar to Xenopus M phase MAP kinase activating factor, which was purified previously from mature oocytes (Matsuda, S., Kosako, H., Takenaka, K., Moriyama, K., Sakai, H., Akiyama, T., Gotoh, Y., and Nishida, E. (1992) EMBO J. 11, 973-982), in terms of its functional, immunological, and physico-chemical properties. Thus, the same or a similar upstream activating factor may function in mitogen-induced and M phase-promoting factor-induced MAP kinase activation pathways.

Original languageEnglish
Pages (from-to)16685-16690
Number of pages6
JournalJournal of Biological Chemistry
Volume267
Issue number23
Publication statusPublished - 1992 Aug 15

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Xenopus
Mitogen-Activated Protein Kinases
Mitogens
Cell Division
Epidermal Growth Factor
Phosphorylation
Chemical activation
Nerve Growth Factor
Maturation-Promoting Factor
3T3 Cells
PC12 Cells
Divalent Cations
Threonine
Chromatography
Phosphoric Monoester Hydrolases
Serine
Chemical properties
Oocytes
Tyrosine
Rats

ASJC Scopus subject areas

  • Biochemistry

Cite this

A mitogen-activated protein (MAP) kinase activating factor in mammalian mitogen-stimulated cells is homologous to Xenopus M phase MAP kinase activator. / Shirakabe, Kyoko; Gotoh, Yukiko; Nishida, Eisuke.

In: Journal of Biological Chemistry, Vol. 267, No. 23, 15.08.1992, p. 16685-16690.

Research output: Contribution to journalArticle

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