Sequential assembly of myosin II, an IQGAP-like protein, and filamentous actin to a ring structure involved in budding yeast cytokinesis.

Sequential assembly of myosin II, an IQGAP-like protein, and filamentous actin to a ring structure involved in budding yeast cytokinesis.
复制标题

DOI:
10.1083/jcb.140.2.355
复制
发表时间:
1998-01-26
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Li R
Li R
中科院分区:
其他
文献类型:
--
作者:
Lippincott J;Li R

文献摘要

参考文献

被引文献

相似文献

我们已经鉴定出一种酿酒酵母蛋白 Cyk1p,它与哺乳动物 IQGAP 具有序列相似性。 Cyk1p 基因破坏会导致胞质分裂失败,但不会影响细胞周期中的其他事件。 Cyk1p 扩散到整个细胞周期的大部分时间,但在后期开始后定位于母芽连接处的环状结构。该环含有丝状肌动蛋白和 Myo1p(肌球蛋白 II 同源物)。对绿色荧光蛋白标记的 Myo1p 的体内观察表明,环在细胞分裂过程中尺寸急剧减小,因此可能具有收缩性。这些结果表明出芽酵母中的胞质分裂可能涉及基于肌动球蛋白的收缩环。该环的组装发生在时间上不同的步骤中:Myo1p 定位到一个环,该环在芽出现前不久的 G1-S 过渡处与隔膜重叠;在有丝分裂后期 Cdc15 通路激活后,Cyk1p 和肌动蛋白在该环中积累。 Cdc12p 的突变消除了肌球蛋白的定位,这表明脓蛋白丝在肌动球蛋白环的组装中发挥了作用。在 Cyk1p 耗尽的细胞中没有观察到肌动蛋白在细胞因子环中的积累,这表明 Cyk1p 在肌动蛋白丝的募集中发挥作用,可能是通过类似于哺乳动物 IQGAP 所证明的丝结合活性。
We have identified a Saccharomyces cerevisiae protein, Cyk1p, that exhibits sequence similarity to the mammalian IQGAPs. Gene disruption of Cyk1p results in a failure in cytokinesis without affecting other events in the cell cycle. Cyk1p is diffused throughout most of the cell cycle but localizes to a ring structure at the mother–bud junction after the initiation of anaphase. This ring contains filamentous actin and Myo1p, a myosin II homologue. In vivo observation with green fluorescent protein–tagged Myo1p showed that the ring decreases drastically in size during cell division and therefore may be contractile. These results indicate that cytokinesis in budding yeast is likely to involve an actomyosin-based contractile ring. The assembly of this ring occurs in temporally distinct steps: Myo1p localizes to a ring that overlaps the septins at the G1-S transition slightly before bud emergence; Cyk1p and actin then accumulate in this ring after the activation of the Cdc15 pathway late in mitosis. The localization of myosin is abolished by a mutation in Cdc12p, implicating a role for the septin filaments in the assembly of the actomyosin ring. The accumulation of actin in the cytokinetic ring was not observed in cells depleted of Cyk1p, suggesting that Cyk1p plays a role in the recruitment of actin filaments, perhaps through a filament-binding activity similar to that demonstrated for mammalian IQGAPs.
DOI: 10.1083/jcb.126.4.821
发表时间: 1994-08
期刊: The Journal of cell biology
影响因子: --
作者:
Bretscher A;Drees B;Harsay E;Schott D;Wang T
通讯作者: Wang T
DOI: 10.1083/jcb.69.3.717
发表时间: 1976-06
期刊: The Journal of cell biology
影响因子: --
作者:
Byers B;Goetsch L
通讯作者: Goetsch L
DOI: 10.1083/jcb.120.5.1187
发表时间: 1993-03
期刊: The Journal of cell biology
影响因子: --
作者:
Kishi K;Sasaki T;Kuroda S;Itoh T;Takai Y
通讯作者: Takai Y
DOI: 10.1083/jcb.137.4.891
发表时间: 1997-05-19
影响因子: 7.8
作者:
Adachi, H;Takahashi, Y;Sutoh, K
通讯作者: Sutoh, K
DOI: 10.1128/mcb.17.6.3408
发表时间: 1997-06-01
影响因子: 5.3
作者:
Lee, KS;Erikson, RL
通讯作者: Erikson, RL