RACK1 Is an Interaction Partner of ATG5 and a Novel Regulator of Autophagy
RACK1 Is an Interaction Partner of ATG5 and a Novel Regulator of Autophagy
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Tarih
2016-01-01
Yazarlar
Erbil, Secil
Oral, Ozlem
Mitou, Geraldine
Kig, Cenk
Durmaz-Timucin, Emel
Guven-Maiorov, Emine
Gulacti, Ferah
Gokce, Gokcen
Dengjel, Jorn
Sezerman, Osman Ugur
Süreli Yayın başlığı
Süreli Yayın ISSN
Cilt Başlığı
Yayınevi
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
Dergi Adı
JOURNAL OF BIOLOGICAL CHEMISTRY
Özet
Autophagy is biological mechanism allowing recycling of long-lived proteins, abnormal protein aggregates, and damaged organelles under cellular stress conditions. Following sequestration in double-or multimembrane autophagic vesicles, the cargo is delivered to lysosomes for degradation. ATG5 is a key component of an E3-like ATG12-ATG5-ATG16 protein complex that catalyzes conjugation of the MAP1LC3 protein to lipids, thus controlling autophagic vesicle formation and expansion. Accumulating data indicate that ATG5 is a convergence point for autophagy regulation. Here, we describe the scaffold protein RACK1 (receptor activated C-kinase 1, GNB2L1) as a novel ATG5 interactor and an autophagy protein. Using several independent techniques, we showed that RACK1 interacted with ATG5. Importantly, classical autophagy inducers (starvation or mammalian target of rapamycin blockage) stimulated RACK1-ATG5 interaction. Knockdown of RACK1 or prevention of its binding to ATG5 using mutagenesis blocked autophagy activation. Therefore, the scaffold protein RACK1 is a new ATG5-interacting protein and an important and novel component of the autophagy pathways.