183 resultados para jauhemainen aine
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The efficient activation of p90rsk by MAP kinase requires their interaction through a docking site located at the C-terminal end of p90rsk. The MAP kinase p42mpk1 can associate with p90rsk in G2-arrested but not in mature Xenopus oocytes. In contrast, an N-terminally truncated p90rsk mutant named D2 constitutively interacts with p42mpk1. In this report we show that expression of D2 inhibits Xenopus oocyte maturation. The inhibition requires the p42mpk1 docking site. D2 expression uncouples the activation of p42mpk1 and p34cdc2/cyclin B in response to progesterone but does not prevent signaling through p90rsk. Instead, D2 interferes with a p42mpk1-triggered pathway, which regulates the phosphorylation and activation of Plx1, a potential activator of the Cdc25 phosphatase. This new pathway that links the activation of p42mpk1 and Plx1 during oocyte maturation is independent of p34cdc2/cyclin B activity but requires protein synthesis. Using D2, we also provide evidence that the sustained activation of p42mpk1 can trigger nuclear migration in oocytes. Our results indicate that D2 is a useful tool to study MAP kinase function(s) during oocyte maturation. Truncated substrates such as D2, which constitutively interact with MAP kinases, may also be helpful to study signal transduction by MAP kinases in other cellular processes.
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Mode of access: Internet.
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Poems.
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Includes index.
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Mode of access: Internet.
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Mode of access: Internet.
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Vols. 1-6, "tragédies"; v. 7, "drames"; v. 8-23, "comédies"
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Mode of access: Internet.
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MTSD 0423-8.
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MTSD 0423.
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Es una edición distinta, pero con mismo pie de imprenta, de CCPB000205124-9. Obsérvese paginación y signatura tipográfica.
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Es una edición distinta, pero con mismo pie de imprenta, de CCPB000205125-7. Obsérvese paginación y signatura tipográfica.
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Es edición diferente, a pesar de tener el mismo pie de imprenta, que la del CCPB000365530-X. Observese paginación y signatura tipográfica.
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Es edición diferente, a pesar de tener el mismo pie de imprenta, que la del CCPB000365541-5. Obsérvese paginación y signatura tipográfica.