[No authors listed]
Cul5-based complex is a member of ECS (Elongin B/C-Cul2/Cul5-SOCS-box protein) ubiquitin ligase family. The cellular function of the Cul5-based complex is poorly understood. In this study, we found that oocyte septum formation and egg production did not occur in either cul-5- or rbx-2-depleted cul-2 homozygotes, although control cul-2 homozygotes laid approximately 50 eggs. These phenotypes are reminiscent of those caused by the MAP kinase mpk-1 depletion. In fact, activation of MPK-1 was significantly inhibited in cul-5-depleted cul-2 mutant and cul-2-depleted cul-5 mutant. Yeast two-hybrid analysis and experiments suggest that oocyte maturation from pachytene exit and MPK-1 activation are redundantly controlled by the RBX-2-CUL-5- and RBX-1-CUL-2-based complexes.
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