Schmidt S, Hofmann K, Simanis V
Cell Cycle Control Laboratory, Swiss Institute for Experimental Cancer Research (ISREC), Chemin des Boveresses 155, 1066 Epalinges, Switzerland.
Nucleic Acids Res. 1997 Sep 1;25(17):3433-9. doi: 10.1093/nar/25.17.3433.
In the fission yeast Schizosaccharomyces pombe, the cdc11 gene is required for the initiation of septum formation at the end of mitosis. The sce3 gene was cloned as a multi-copy suppressor of the heat-sensitive mutant cdc11-136. When over-expressed, it rescues all mutants of cdc11 and also a heat-sensitive allele of cdc14, but not the cdc14 null mutant. Deletion shows that sce3 is not essential for cell proliferation. It encodes a putative RNA-binding protein which shows homology to human eIF4B. Immunolocalisation indicates that Sce3p is located predominantly in the cytoplasm. Elevated expression of sce3 increases the steady-state level of cdc14 mRNA. Possible mechanisms of its action are discussed.
在裂殖酵母粟酒裂殖酵母中,cdc11基因是有丝分裂末期隔膜形成起始所必需的。sce3基因作为热敏感突变体cdc11 - 136的多拷贝抑制子被克隆出来。当过度表达时,它能拯救所有cdc11突变体以及cdc14的一个热敏感等位基因,但不能拯救cdc14缺失突变体。缺失实验表明sce3对细胞增殖不是必需的。它编码一种推定的RNA结合蛋白,该蛋白与人类eIF4B具有同源性。免疫定位表明Sce3p主要位于细胞质中。sce3的表达升高会增加cdc14 mRNA的稳态水平。文中讨论了其可能的作用机制。