Making two organelles from one: Woronin body biogenesis by peroxisomal protein sorting.

Making two organelles from one: Woronin body biogenesis by peroxisomal protein sorting.
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通过过氧化物酶体蛋白排序从一个中制成两个细胞器:Woronin身体生物发生。

DOI:
10.1083/jcb.200705049
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发表时间:
2008-01-28
影响因子:
7.8
通讯作者:
Jedd, Gregory
Jedd, Gregory
中科院分区:
生物学1区
文献类型:
--
作者:
Liu, Fangfang;Ng, Seng Kah;Lu, Yanfen;Low, Wilson;Lai, Julian;Jedd, Gregory

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沃罗宁体(WB)是一种致密核心的细胞器,仅存在于丝状真菌中,并在受伤时密封隔膜孔。这些细胞器由HEX蛋白组成的膜结合蛋白基质组成,尽管它们由过氧化物酶体形成,但它们的生物起源知之甚少。在粗糙脉孢菌中,我们鉴定了Woronin分选复合物(WSC),一种在WB生物发生中具有双重功能的PMP 22/MPV 17相关膜蛋白。WSC定位于大的过氧化物酶体膜,在那里它自组装成包裹HEX组件的耐洗涤剂的低聚物,产生不对称的新生WB。在需要WSC的反应中,这些结构被递送到细胞皮层,这允许新生WB和WB遗传的划分。我们的研究结果表明,WSC和HEX合作和控制不同方面的WB生物发生和皮质协会取决于WSC,这反过来又取决于HEX。这种依赖性有助于跨细胞器膜的事件,允许过氧化物酶体产生具有不同组成和细胞内分布的第二个细胞器。
Woronin bodies (WBs) are dense-core organelles that are found exclusively in filamentous fungi and that seal the septal pore in response to wounding. These organelles consist of a membrane-bound protein matrix comprised of the HEX protein and, although they form from peroxisomes, their biogenesis is poorly understood. In Neurospora crassa, we identify Woronin sorting complex (WSC), a PMP22/MPV17-related membrane protein with dual functions in WB biogenesis. WSC localizes to large peroxisome membranes where it self-assembles into detergent-resistant oligomers that envelop HEX assemblies, producing asymmetrical nascent WBs. In a reaction requiring WSC, these structures are delivered to the cell cortex, which permits partitioning of the nascent WB and WB inheritance. Our findings suggest that WSC and HEX collaborate and control distinct aspects of WB biogenesis and that cortical association depends on WSC, which in turn depends on HEX. This dependency helps order events across the organellar membrane, permitting the peroxisome to produce a second organelle with a distinct composition and intracellular distribution.
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发表时间: 1994-09
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