TY  - JOUR
TI  - Protein phosphorylation during meiotic maturation of Xenopus oocytes: cdc2 protein kinase targets.
AU  - Belle, R
AU  - Cormier, P
AU  - Poulhe, R
AU  - Morales, J
AU  - Huchon, D
AU  - Mulner-Lorillon, O
T2  - The International Journal of Developmental Biology
AB  - M-Phase specific protein kinase or cdc2 protein kinase is a component of MPF (M-Phase promoting factor). During meiotic maturation of Xenopus oocytes, cdc2 protein kinase is activated in correlation with MPF activity. A protein phosphorylation cascade takes place involving several protein kinases, among which casein kinase II, and different changes associated with meiosis occur such as germinal vesicle breakdown, chromosome condensation, cytoskeletal reorganization and increase in protein synthesis. Our results provide a biochemical link between cdc2 protein kinase and protein synthesis since they show that the kinase phosphorylates in vitro a p47 protein identified as elongation factor EF1 (gamma subunit) and that the in vitro site of p47 corresponds to the site phosphorylated in vivo. Immunofluorescence showed that the elongation factor (EF1-beta gamma) is localized in the oocyte cortex. Furthermore, they show that cdc2 kinase phosphorylates and activates casein kinase II in vitro, strongly supporting the view that casein kinase II is involved in the phosphorylation cascade originated by cdc2 kinase.
PY  - 1990
VL  - 34
IS  - 1
SP  - 111
EP  - 115
J2  - Int. J. Dev. Biol.
LA  - en
SN  - 0214-6282
SN  - 1696-3547
UR  - https://ijdb.ehu.eus/article/2203450
Y2  - 2024/11/05/19:22:28
ER  -