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Purification and characterization of maturation-promoting factor in fish
M Yamashita1, S Fukada, M Yoshikuni
1Laboratory of Reproductive Biology, National Institute for Basic Biology, Okazaki, Japan.
Developmental Biology
|January 1, 1992
Summary
Maturation-promoting factor (MPF) was purified from fish oocytes, revealing it
Area of Science:
- * Developmental Biology
- * Molecular Biology
- * Biochemistry
Background:
- * Maturation-promoting factor (MPF) is crucial for cell cycle progression.
- * MPF activity has not been previously characterized in fish oocytes.
Purpose of the Study:
- * To purify and characterize MPF from carp oocytes.
- * To identify the protein components of carp MPF.
Main Methods:
- * Purification of MPF using sequential chromatography (Q-Sepharose, p13suc1-affinity, Mono S, Superose 12).
- * SDS-PAGE and Western blot analysis to identify protein components.
- * Phosphorylation analysis using 32P labeling.
Main Results:
- * MPF was purified over 1000-fold from carp oocytes.
- * Purified MPF exhibited an apparent molecular weight of 100 kDa.
- * MPF consists of cdc2 kinase and cyclin B, with active MPF containing phosphorylated cdc2 kinase.
Conclusions:
- * This study demonstrates MPF activity in fish oocytes for the first time.
- * Carp MPF is a complex of cdc2 kinase and cyclin B.
- * Active MPF involves the phosphorylated form of cdc2 kinase.