Budding yeast RSI1/APC2, a novel gene necessary for initiation of anaphase, encodes an APC subunit

Budding yeast RSI1/APC2, a novel gene necessary for initiation of anaphase, encodes an APC subunit
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芽殖酵母 RSI1/APC2 是后期启动所必需的新基因,编码 APC 亚基

DOI:
10.1093/emboj/17.2.498
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发表时间:
1998
期刊:
The EMBO Journal
影响因子:
--
通讯作者:
L. Johnston
L. Johnston
中科院分区:
--
文献类型:
--
作者:
Kate M. Kramer;D. Fesquet;A. Johnson;L. Johnston

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SIC 1是编码Cdc 28-Clb激酶活性的CDK抑制剂的非必需基因。Sic 1 p参与有丝分裂退出和DNA合成的时间。为了确定参与控制Clb激酶活性的其他基因,我们对使SIC 1必需的突变进行了遗传筛选。在这里,我们描述了一个基因,我们已经确定了这种手段,RSI 1/APC 2。温度敏感的rsi 1/apc 2突变体在中期停滞并且不能降解Clb 2 p,这表明Rsi 1 p/Apc 2 p与后期促进复合物(APC)相关。这是一种E3泛素连接酶,通过降解Pds 1 p控制后期起始,通过降解Clb细胞周期蛋白控制有丝分裂退出。事实上,rsi 1/apc 2温度敏感突变体中的后期阻滞通过去除PDS 1而被克服,这与Rsi 1 p/Apc 2 p是APC的一部分一致。此外,与我们的rsi 1/apc 2突变一样,编码已知APC亚基的cdc 23 - 1也与sic 1 Δ一起致死。因此,当APC功能受损时,SIC 1显然变得至关重要。最后,我们发现Rsi 1 p/Apc 2 p与Cdc 23 p共免疫沉淀。综上所述,我们的结果表明RSI 1/APC 2是APC的亚基。
SIC1 is a non‐essential gene encoding a CDK inhibitor of Cdc28‐Clb kinase activity. Sic1p is involved in both mitotic exit and the timing of DNA synthesis. To identify other genes involved in controlling Clb‐kinase activity, we have undertaken a genetic screen for mutations which render SIC1 essential. Here we describe a gene we have identified by this means, RSI1/APC2. Temperature‐sensitive rsi1/apc2 mutants arrest in metaphase and are unable to degrade Clb2p, suggesting that Rsi1p/Apc2p is associated with the anaphase promoting complex (APC). This is an E3 ubiquitin‐ligase that controls anaphase initiation through degradation of Pds1p and mitotic exit via degradation of Clb cyclins. Indeed, the anaphase block in rsi1/apc2 temperature‐sensitive mutants is overcome by removal of PDS1, consistent with Rsi1p/Apc2p being part of the APC. In addition, like our rsi1/apc2 mutations, cdc23‐1, encoding a known APC subunit, is also lethal with sic1Δ. Thus SIC1 clearly becomes essential when APC function is compromised. Finally, we find that Rsi1p/Apc2p co‐immunoprecipitates with Cdc23p. Taken together, our results suggest that RSI1/APC2 is a subunit of APC.
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