Fission yeast mtr1p regulates interphase microtubule cortical dwell-time.

Fission yeast mtr1p regulates interphase microtubule cortical dwell-time.
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DOI:
10.1242/bio.20148607
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发表时间:
2014-06-13
期刊:
影响因子:
2.4
通讯作者:
Tran PT
Tran PT
中科院分区:
生物学4区
文献类型:
--
作者:
Carlier-Grynkorn F;Ji L;Fraisier V;Lombard B;Dingli F;Loew D;Paoletti A;Ronot X;Tran PT

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微管骨架在细胞极性、运动和分裂中起重要作用。微管固有地经历动态不稳定性,在生长和收缩阶段之间随机切换。在细胞中,一些微管相关蛋白(MAPs)和分子马达可以进一步调节微管动力学。我们在这里提出的裂变酵母MTR1+,微管动力学的一个新的调节器,似乎不是MAP或电机。MTR1缺失(MTR1Δ)主要导致微管在细胞尖端皮层的停留时间延长,表明MTR1P直接或间接地作为微管的去稳定剂。mtr1p是mal3p的拮抗剂,mal3p是哺乳动物EB 1的直系同源物,其稳定微管。mal3Δ导致短的微管,但是可以被mtr 1 Δ部分拯救,因为双突变体mal3Δ mtr 1 Δ比mal3Δ单突变体表现出更长的微管。通过序列同源性,mtr1p被预测为核糖体质量控制复合物的一个组成部分。有趣的是,预测的核糖体基因rps1801的缺失也导致了与mtr1Δ相似的更长的微管停留时间。双突变体mal3Δ rps1801Δ的微管也比单突变体mal3Δ长。我们的研究表明,可能参与的mtr1p和核糖体复合物在调节微管动力学。
The microtubule cytoskeleton plays important roles in cell polarity, motility and division. Microtubules inherently undergo dynamic instability, stochastically switching between phases of growth and shrinkage. In cells, some microtubule-associated proteins (MAPs) and molecular motors can further modulate microtubule dynamics. We present here the fission yeast mtr1+, a new regulator of microtubule dynamics that appears to be not a MAP or a motor. mtr1-deletion (mtr1Δ) primarily results in longer microtubule dwell-time at the cell tip cortex, suggesting that mtr1p acts directly or indirectly as a destabilizer of microtubules. mtr1p is antagonistic to mal3p, the ortholog of mammalian EB1, which stabilizes microtubules. mal3Δ results in short microtubules, but can be partially rescued by mtr1Δ, as the double mutant mal3Δ mtr1Δ exhibits longer microtubules than mal3Δ single mutant. By sequence homology, mtr1p is predicted to be a component of the ribosomal quality control complex. Intriguingly, deletion of a predicted ribosomal gene, rps1801, also resulted in longer microtubule dwell-time similar to mtr1Δ. The double-mutant mal3Δ rps1801Δ also exhibits longer microtubules than mal3Δ single mutant alone. Our study suggests a possible involvement of mtr1p and the ribosome complex in modulating microtubule dynamics.
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