期刊
CELLULAR SIGNALLING
卷 17, 期 2, 页码 205-215出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cellsig.2004.07.002
关键词
26S proteasome; alpha 4 subunit; casein kinase I; phosphorylation; meiotic cell cycle; goldfish
类别
The proteasome is involved in the progression of the meiotic cell cycle in fish oocytes. We reported that the alpha4 subunit of the 26S proteasome, which is a component of the outer rings of the 20S proteasome, is phosphorylated in immature oocytes and dephosphorylated in mature oocytes. To investigate the role of the phosphorylation, we purified the protein kinase from immature oocytes using a recombinant alpha4 subunit as substrate. A protein band which well corresponded to the kinase activity was identified as casein kinase Ialpha (CKIalpha). Two-dimensional (2D) PAGE analysis showed that part of the alpha4 subunit was phosphorylated by CKIalpha in vitro. This spot was detected in purified immature 26S proteasome but not in mature 26S proteasome, demonstrate that the alpha4 subunit is phosphorylated by CKIalpha meiotic cell cycle dependently. (C) 2004 Elsevier Inc. All rights reserved.
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