Identification and functional analysis of the essential and regulatory light chains of the only type II myosin Myo1p in Saccharomyces cerevisiae.

Identification and functional analysis of the essential and regulatory light chains of the only type II myosin Myo1p in Saccharomyces cerevisiae.
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DOI:
10.1083/jcb.200401040
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发表时间:
2004-06-21
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Bi E
Bi E
中科院分区:
其他
文献类型:
--
作者:
Luo J;Vallen EA;Dravis C;Tcheperegine SE;Drees B;Bi E

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酿酒酵母中的胞质分裂涉及肌动球蛋白环收缩与隔膜形成和/或靶向膜沉积之间的协调。我们发现,Mlc 1 p,Myo 2 p(V型肌球蛋白)和Iqg 1 p(IQGAP)的轻链,是Myo 1 p的必需轻链,Myo 1 p是S.啤酒。然而,通过删除Myo 1 p上的Mlc 1 p结合位点或MLC 1中的点突变(mlc 1 -93)来破坏或减少Mlc 1 p-Myo 1 p相互作用,不会导致胞质分裂中的任何明显缺陷。与此相反,不同的点突变,mlc 1 -11,在胞质分裂和在与Myo 2 p和Iqg 1 p的相互作用中显示缺陷。这些数据表明,Mlc 1 p-Myo 1 p相互作用的主要功能不是调节Myo 1 p的活性,但Mlc 1 p可能与Myo 1 p,Iqg 1 p和Myo 2 p相互作用,以协调肌动蛋白环的形成和有针对性的细胞质分裂过程中的膜沉积。我们还确定Mlc 2 p作为Myo 1 p的调节轻链,并证明其在Myo 1 p环拆卸中的作用,这是真核生物中可能保守的功能。
Cytokinesis in Saccharomyces cerevisiae involves coordination between actomyosin ring contraction and septum formation and/or targeted membrane deposition. We show that Mlc1p, a light chain for Myo2p (type V myosin) and Iqg1p (IQGAP), is the essential light chain for Myo1p, the only type II myosin in S. cerevisiae. However, disruption or reduction of Mlc1p–Myo1p interaction by deleting the Mlc1p binding site on Myo1p or by a point mutation in MLC1, mlc1-93, did not cause any obvious defect in cytokinesis. In contrast, a different point mutation, mlc1-11, displayed defects in cytokinesis and in interactions with Myo2p and Iqg1p. These data suggest that the major function of the Mlc1p–Myo1p interaction is not to regulate Myo1p activity but that Mlc1p may interact with Myo1p, Iqg1p, and Myo2p to coordinate actin ring formation and targeted membrane deposition during cytokinesis. We also identify Mlc2p as the regulatory light chain for Myo1p and demonstrate its role in Myo1p ring disassembly, a function likely conserved among eukaryotes.
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