Direct uptake and degradation of DNA by lysosomes.

Direct uptake and degradation of DNA by lysosomes.
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DOI:
10.4161/auto.24880
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发表时间:
2013-08
期刊:
影响因子:
13.3
通讯作者:
Kabuta T
Kabuta T
中科院分区:
生物学1区
文献类型:
--
作者:
Fujiwara Y;Kikuchi H;Aizawa S;Furuta A;Hatanaka Y;Konya C;Uchida K;Wada K;Kabuta T

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溶酶体含有各种水解酶,可降解蛋白质、脂质、核酸和碳水化合物。我们最近发现了“RNA自噬”,这是一种自噬途径,其中RNA直接被溶酶体吸收并降解。溶酶体膜蛋白LAMP2C是LAMP2的剪接变体,与RNA结合并作为该途径的受体。在目前的研究中,我们表明,DNA也直接采取了溶酶体和降解。与RNautophagy一样,这种自噬途径,我们称之为“DNautophagy”,依赖于ATP。LAMP2C的胞质序列也直接与DNA相互作用,并且除了RNA自噬之外,LAMP2C还充当DNA自噬的受体。与RNA类似,DNA结合到苍蝇和线虫LAMP直向同源物的胞质序列。结合我们以前的研究结果,我们目前的研究结果表明,RNautophagy和DNautophagy在后生动物中是进化保守的系统。
Lysosomes contain various hydrolases that can degrade proteins, lipids, nucleic acids and carbohydrates. We recently discovered “RNautophagy,” an autophagic pathway in which RNA is directly taken up by lysosomes and degraded. A lysosomal membrane protein, LAMP2C, a splice variant of LAMP2, binds to RNA and acts as a receptor for this pathway. In the present study, we show that DNA is also directly taken up by lysosomes and degraded. Like RNautophagy, this autophagic pathway, which we term “DNautophagy,” is dependent on ATP. The cytosolic sequence of LAMP2C also directly interacts with DNA, and LAMP2C functions as a receptor for DNautophagy, in addition to RNautophagy. Similarly to RNA, DNA binds to the cytosolic sequences of fly and nematode LAMP orthologs. Together with the findings of our previous study, our present findings suggest that RNautophagy and DNautophagy are evolutionarily conserved systems in Metazoa.
循环线粒体 DAMP 会引起对损伤的炎症反应。
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