Abstract:
:Regulated degradation of cellular components by lysosomes is essential to maintain biological homeostasis. In mammals, three forms of autophagy, macroautophagy, microautophagy and chaperone-mediated autophagy (CMA), have been identified. Here, we showed a novel type of autophagy, in which RNA is taken up directly into lysosomes for degradation. This pathway, which we term "RNautophagy," is ATP-dependent, and unlike CMA, is independent of HSPA8/Hsc70. LAMP2C, a lysosomal membrane protein, serves as a receptor for this pathway. The cytosolic tail of LAMP2C specifically binds to almost all total RNA derived from mouse brain. The cytosolic sequence of LAMP2C and its affinity for RNA are evolutionarily conserved from nematodes to humans. Our findings shed light on the mechanisms underlying RNA homeostasis in higher eukaryotes.
journal_name
Autophagyjournal_title
Autophagyauthors
Fujiwara Y,Furuta A,Kikuchi H,Aizawa S,Hatanaka Y,Konya C,Uchida K,Yoshimura A,Tamai Y,Wada K,Kabuta Tdoi
10.4161/auto.23002subject
Has Abstractpub_date
2013-03-01 00:00:00pages
403-9issue
3eissn
1554-8627issn
1554-8635pii
23002journal_volume
9pub_type
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