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- W2176248001 abstract "Research Article1 July 1992free access The ‘second-codon rule’ and autophosphorylation govern the stability and activity of Mos during the meiotic cell cycle in Xenopus oocytes. M. Nishizawa M. Nishizawa Division of Molecular Genetics, Kurume University, Fukuoka, Japan. Search for more papers by this author K. Okazaki K. Okazaki Division of Molecular Genetics, Kurume University, Fukuoka, Japan. Search for more papers by this author N. Furuno N. Furuno Division of Molecular Genetics, Kurume University, Fukuoka, Japan. Search for more papers by this author N. Watanabe N. Watanabe Division of Molecular Genetics, Kurume University, Fukuoka, Japan. Search for more papers by this author N. Sagata N. Sagata Division of Molecular Genetics, Kurume University, Fukuoka, Japan. Search for more papers by this author M. Nishizawa M. Nishizawa Division of Molecular Genetics, Kurume University, Fukuoka, Japan. Search for more papers by this author K. Okazaki K. Okazaki Division of Molecular Genetics, Kurume University, Fukuoka, Japan. Search for more papers by this author N. Furuno N. Furuno Division of Molecular Genetics, Kurume University, Fukuoka, Japan. Search for more papers by this author N. Watanabe N. Watanabe Division of Molecular Genetics, Kurume University, Fukuoka, Japan. Search for more papers by this author N. Sagata N. Sagata Division of Molecular Genetics, Kurume University, Fukuoka, Japan. Search for more papers by this author Author Information M. Nishizawa1, K. Okazaki1, N. Furuno1, N. Watanabe1 and N. Sagata1 1Division of Molecular Genetics, Kurume University, Fukuoka, Japan. The EMBO Journal (1992)11:2433-2446https://doi.org/10.1002/j.1460-2075.1992.tb05308.x PDFDownload PDF of article text and main figures. ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InMendeleyWechatReddit Figures & Info The c-mos proto-oncogene product, Mos, functions in both early (germinal vesicle breakdown) and late (metaphase II arrest) steps during meiotic maturation in Xenopus oocytes. In the early step, Mos is only partially phosphorylated and metabolically unstable, while in the late step it is fully phosphorylated and highly stable. Using a number of Mos mutants expressed in oocytes, we show here that the instability of Mos in the early step is determined primarily by its penultimate N-terminal residue, or by a rule referred to here as the ‘second-codon rule’. We demonstrate that unstable Mos is degraded by the ubiquitin-dependent pathway. In the late step, on the other hand, Mos is stabilized by autophosphorylation at Ser3, which probably acts to prevent the N-terminus of Mos from being recognized by a ubiquitin-protein ligase. Moreover, we show that Ser3 phosphorylation is essential for Mos to exert its full cytostatic factor (CSF) activity in fully mature oocytes. Thus, a few N-terminal amino acids are primary determinants of both the metabolic stability and physiological activity of Mos during the meiotic cell cycle. Previous ArticleNext Article Volume 11Issue 71 July 1992In this issue RelatedDetailsLoading ..." @default.
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- W2176248001 title "The ‘second-codon rule’ and autophosphorylation govern the stability and activity of Mos during the meiotic cell cycle in Xenopus oocytes." @default.
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- W2176248001 doi "https://doi.org/10.1002/j.1460-2075.1992.tb05308.x" @default.
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