Septins are important for cell polarity, septation and asexual spore formation in Neurospora crassa and show different patterns of localisation at germ tube tips.

Septins are important for cell polarity, septation and asexual spore formation in Neurospora crassa and show different patterns of localisation at germ tube tips.
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DOI:
10.1371/journal.pone.0063843
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Read ND
Read ND
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Berepiki A;Read ND

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septin是与gtp结合的细胞骨架蛋白,参与细胞极性、囊泡运输、细胞分裂和细胞形态发生。在这里,我们已经表征了六个septin编码的模式丝状真菌神经孢子虫的基因组。对septin无效突变体的分析表明,septin限制了草属植物胚管的出现位点,对草属植物的分裂和分生具有重要作用。在草草中,septin构成了一系列不同的高阶结构——环、环、纤维、带和帽——它们可以共存于同一个细胞内。它们在胚管顶端的定位模式不同,GFP-CDC-10和CDC-11-GFP在胚管顶端形成一个信号强度较低的亚根尖环,CDC-3-GFP和CDC-12-GFP在胚管顶端形成一个帽状结构,而GFP-ASP-1形成一个延伸的亚根尖环。septin复合物的纯化和分离蛋白的质谱分析显示,septin复合物主要由CDC-3、CDC-10、CDC-11和CDC-12组成。推测的septin ASP-1的免疫沉淀显示该蛋白与核心septin复合物相互作用。
Septins are GTP-binding cytoskeletal proteins that contribute to cell polarity, vesicle trafficking, cytokinesis and cell morphogenesis. Here we have characterised the six septins encoded by the genome of the model filamentous fungus Neurospora crassa. Analysis of septin null mutants demonstrated that septins limit the sites of emergence of germ tubes and are important for septation and conidiation in N. crassa. Septins constituted a range of different higher-order structures in N. crassa – rings, loops, fibres, bands, and caps – which can co-exist within the same cell. They showed different patterns of localisation at germ tube tips, with GFP-CDC-10 and CDC-11-GFP forming a subapical collar with lower signal intensity at the tip apex, CDC-3-GFP and CDC-12-GFP organized as a cap at the tip apex and GFP-ASP-1 forming an extended subapical collar. Purification of the septin complex and mass spectrometry of isolated proteins revealed that the septin complex consists predominantly of CDC-3, CDC-10, CDC-11 and CDC-12. Immunoprecipitation of the putative septin ASP-1 revealed that this protein interacts with the core septin complex.
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