Phosphorylation of Maskin by Aurora-A Participates in the Control of Sequential Protein Synthesis during Xenopus laevis Oocyte Maturation

• Published in: The Journal of biological chemistry Vol. 280; no. 14; pp. 13415 - 13423
• Main Authors: Pascreau, Gaetan, Delcros, Jean-Guy, Cremet, Jean-Yves, Prigent, Claude, Arlot-Bonnemains, Yannick
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 08.04.2005; American Society for Biochemistry and Molecular Biology
• Subjects: Amino Acid Sequence; Animals; Aurora Kinases; Cell Cycle Proteins; Cell Cycle Proteins - metabolism; Cellular Biology; Female; Humans; Life Sciences; Meiosis; Meiosis - physiology; Molecular Sequence Data; Oocytes; Oocytes - cytology; Oocytes - physiology; Peptides; Peptides - metabolism; Phosphorylation; Protein Binding; Protein Kinases; Protein Kinases - genetics; Protein Kinases - metabolism; Protein-Serine-Threonine Kinases; Recombinant Fusion Proteins; Recombinant Fusion Proteins - genetics; Recombinant Fusion Proteins - metabolism; Sequence Alignment; Serine; Serine - metabolism; Transcription Factors; Transcription Factors - genetics; Transcription Factors - metabolism; Two-Hybrid System Techniques; Xenopus laevis; Xenopus Proteins; Xenopus Proteins - genetics; Xenopus Proteins - metabolism
• ISSN: 0021-9258; 1083-351X
• DOI: 10.1074/jbc.M410584200

At the end of oogenesis, Xenopus laevis stage VI oocytes are arrested at the G2/M transition (prophase) waiting for progesterone to release the block and begin maturation. Progesterone triggers a cascade of phosphorylation events such as a decrease of pKa and an increase of maturating-promoting factor activity. Progression through meiosis was controlled by the sequential synthesis of several proteins. For instance, the MAPK kinase kinase c-Mos is the very first protein to be produced, whereas cyclin B1 appears only after meiosis I. After the meiotic cycles, the oocyte arrests at metaphase of meiosis II with an elevated c-Mos kinase activity (cytostatic factor). By using a two-hybrid screen, we have identified maskin, a protein involved in the control of mRNA sequential translation, as a binding partner of Aurora-A, a protein kinase necessary for oocyte maturation. Here we showed that, in vitro, Aurora-A directly binds to maskin and that both proteins can be co-immunoprecipitated from oocyte extracts, suggesting that they do associate in vivo. We also demonstrated that Aurora-A phosphorylates maskin on a Ser residue conserved in transforming acidic coiled coil proteins from Drosophila to human. When the phosphorylation of this Ser was inhibited in vivo by microinjection of synthetic peptides that mimic the maskin-phosphorylated sequence, we observed a premature maturation. Under these conditions, proteins such as cyclin B1 and Cdc6, which are normally detected only in meiosis II, were massively produced in meiosis I before the occurrence of the nuclear envelope breakdown. This result strongly suggests that phosphorylation of maskin by Aurora-A prevents meiosis II proteins from being produced during meiosis I.