MPF from starfish oocytes at first meiotic metaphase is a heterodimer containing one molecule of cdc2 and one molecule of cyclin B.
We have purified to near homogeneity the M-phase-specific protein kinase from starfish oocytes at first meiotic metaphase, using an improved procedure based on affinity chromatography on the immobilized yeast protein suc1. As already reported, this is identical to MPF, the cytoplasmic factor that controls entry of eukaryotic cells into M-phase. MPF is a complex formed by the stoichiometric association of a 34-kd polypeptide previously identified as cdc2 with a polypeptide that migrates with the same mobility as starfish cyclin in SDS-PAGE (apparent mol. wt 47 kd). A cDNA clone encoding starfish cyclin B has been isolated and its sequence determined. It contains a single open reading frame encoding a predicted 43 729-dalton protein. Partial microsequencing of the 47-kd polypeptide component of MPF allowed its identification as the starfish cyclin. Since the apparent mol. wt of native starfish MPF was found to be less than 100 kd, it is a heterodimer comprising one molecule of cdc2 and one molecule of cyclin B.
Labbé
J C
JC
CNRS and INSERM, BP 5051, Montpellier, France.
Capony
J P
JP
Caput
D
D
Cavadore
J C
JC
Derancourt
J
J
Kaghad
M
M
Lelias
J M
JM
Picard
A
A
Dorée
M
M
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D016203:CDC2 Protein Kinase; D002846:Chromatography, Affinity; D002851:Chromatography, High Pressure Liquid; D016213:Cyclins; D004247:DNA / Q000235:genetics; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D006133:Growth Substances / Q000032:analysis* / Q000235:genetics; D007447:Invertebrate Hormones; D046911:Macromolecular Substances; D016200:Maturation-Promoting Factor; D008540:Meiosis; D008677:Metaphase; D008969:Molecular Sequence Data; D009865:Oocytes / Q000032:analysis*; D010750:Phosphoproteins / Q000032:analysis* / Q000235:genetics; D011494:Protein Kinases / Q000032:analysis* / Q000235:genetics; D012689:Sequence Homology, Nucleic Acid; D013215:Starfish
D016213:Cyclins; D006133:Growth Substances; D007447:Invertebrate Hormones; D046911:Macromolecular Substances; D010750:Phosphoproteins; D004247:DNA; D011494:Protein Kinases; D016203:CDC2 Protein Kinase; D016200:Maturation-Promoting Factor