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• W2131892263 endingPage "2893" @default.
• W2131892263 startingPage "2885" @default.
• W2131892263 abstract "ABSTRACT The most abundant microtubule-associated protein in sea urchin eggs and embryos is the 77 kDa echinoderm micro-tubule-associated protein (EMAP). EMAP localizes to the mitotic spindle as well as the interphase microtubule array and is a likely target for a cell cycle-activated kinase. To determine if EMAP is phosphorylated in vivo, sea urchin eggs and embryos were metabolically labeled with 32PO4 and a monospecific antiserum was used to immunoprecipitate EMAP from 32P-labeled eggs and embryos. In this study, we demonstrate that the 77 kDa EMAP is phosphorylated in vivo by two distinct mechanisms. In the unfertilized egg, EMAP is constitutively phosphorylated on at least five serine residues. During the first cleavage division following fertilization, EMAP is phosphorylated with a cell cycle-dependent time course. As the embryo enters mitosis, EMAP phosphorylation increases, and as the embryo exits mitosis, phosphorylation decreases. During mitosis, EMAP is phosphorylated on 10 serine residues and two-dimensional phosphopeptide mapping reveals a mitosis-specific site of phosphorylation. At all stages of the cell cycle, a 33 kDa polypeptide copurifies with the 77 kDa EMAP, regardless of phosphorylation state. Antibodies against the cdc2 kinase were used to demonstrate that the 33 kDa polypeptide is the p34cdc2 kinase. The p34cdc2 kinase copurifies with the mitotic apparatus and immunostaining indicates that the p34cdc2 kinase is concentrated at the spindle poles. Models for the interaction of the p34cdc2 kinase and the 77 kDa EMAP are presented." @default.
• W2131892263 created "2016-06-24" @default.
• W2131892263 creator A5047430948 @default.
• W2131892263 creator A5064498062 @default.
• W2131892263 creator A5091156243 @default.
• W2131892263 date "1996-12-01" @default.
• W2131892263 modified "2023-09-29" @default.
• W2131892263 title "Cell cycle-dependent phosphorylation of the 77 kDa echinoderm microtubule-associated protein (EMAP) in vivo and association with the p34cdc2 kinase" @default.
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• W2131892263 doi "https://doi.org/10.1242/jcs.109.12.2885" @default.
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