A bipolar spindle of antiparallel ParM filaments drives bacterial plasmid segregation.
A bipolar spindle of antiparallel ParM filaments drives bacterial plasmid segregation.
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DOI:
10.1126/science.1229091
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发表时间:
2012-12-07
期刊:
影响因子:
--
通讯作者:
Löwe J
中科院分区:
文献类型:
--
作者:
Gayathri P;Fujii T;Møller-Jensen J;van den Ent F;Namba K;Löwe J
To ensure their stable inheritance by daughter cells during cell division, bacterial low copy-number plasmids make simple DNA segregating machines that use an elongating protein filament between sister plasmids. In the ParMRC system of Escherichia coli R1 plasmid, ParM, an actin-like protein, forms the spindle between ParRC complexes on sister plasmids. Using a combination of structural work and total internal reflection fluorescence microscopy, we show that ParRC bound and could accelerate growth at only one end of polar ParM filaments, mechanistically resembling eukaryotic formins. The architecture of ParM filaments enabled two ParRC-bound filaments to associate in an antiparallel orientation, forming a bipolar spindle. The spindle elongated as a bundle of at least two antiparallel filaments, thereby pushing two plasmid clusters towards the poles.
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