Discovery of a novel type of autophagy targeting RNA.

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

Autophagy

journal_title

Autophagy

authors

Fujiwara Y,Furuta A,Kikuchi H,Aizawa S,Hatanaka Y,Konya C,Uchida K,Yoshimura A,Tamai Y,Wada K,Kabuta T

doi

10.4161/auto.23002

subject

Has Abstract

pub_date

2013-03-01 00:00:00

pages

403-9

issue

3

eissn

1554-8627

issn

1554-8635

pii

23002

journal_volume

9

pub_type

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