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Autophagy. 2019 Sep;15(9):1655-1656. doi: 10.1080/15548627.2019.1628548. Epub 2019 Jul 1.

CALCOCO2/NDP52 initiates selective autophagy through recruitment of ULK and TBK1 kinase complexes.

Author information

1
a Division of Protein and Nucleic Acid Chemistry, MRC Laboratory of Molecular Biology , Cambridge , UK.
2
b Department of Medicine, Addenbrooke's Hospital, University of Cambridge , Cambridge , UK.

Abstract

The selective macroautophagy of prospective cargo necessitates activity of the autophagy machinery at cargo-determined locations. Whether phagophore membranes are recruited to, or are generated de novo at, the cargo is unknown. In our recent study we show that damaged Salmonella-containing vacuoles, marked by LGALS8/galectin-8, engage the cargo receptor CALCOCO2/NDP52 to recruit the autophagy-initiating ULK and TBK1 complexes and cause the formation of WIPI2-positive phagophore membranes. CALCOCO2 functions in the induction of autophagy by forming a trimer with RB1CC1/FIP200 and TBKBP1/SINTBAD-AZI2/NAP1, components of the ULK and TBK1 kinase complexes, respectively. Such recruitment of the upstream autophagy machinery to prospective cargo reveals how in complex eukaryotes detection of cargo-associated 'eat me' signals, induction of autophagy, and juxtaposition of cargo and phagophores are integrated.

KEYWORDS:

Autophagy; FIP200; NDP52; Salmonella; TBK1; ULK1; cargo receptor; eat-me signal; galectin-8

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