Molecular determinants regulating selective binding of autophagy adapters and receptors to ATG8 proteins

Martina Wirth (), Wenxin Zhang, Minoo Razi, Lynet Nyoni, Dhira Joshi, Nicola O’Reilly, Terje Johansen, Sharon A. Tooze () and Stéphane Mouilleron ()
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Martina Wirth: The Francis Crick Institute
Wenxin Zhang: The Francis Crick Institute
Minoo Razi: The Francis Crick Institute
Lynet Nyoni: The Francis Crick Institute
Dhira Joshi: The Francis Crick Institute
Nicola O’Reilly: The Francis Crick Institute
Terje Johansen: University of Tromsø – The Arctic University of Norway
Sharon A. Tooze: The Francis Crick Institute
Stéphane Mouilleron: The Francis Crick Institute

Nature Communications, 2019, vol. 10, issue 1, 1-18

Abstract: Abstract Autophagy is an essential recycling and quality control pathway. Mammalian ATG8 proteins drive autophagosome formation and selective removal of protein aggregates and organelles by recruiting autophagy receptors and adaptors that contain a LC3-interacting region (LIR) motif. LIR motifs can be highly selective for ATG8 subfamily proteins (LC3s/GABARAPs), however the molecular determinants regulating these selective interactions remain elusive. Here we show that residues within the core LIR motif and adjacent C-terminal region as well as ATG8 subfamily-specific residues in the LIR docking site are critical for binding of receptors and adaptors to GABARAPs. Moreover, rendering GABARAP more LC3B-like impairs autophagy receptor degradation. Modulating LIR binding specificity of the centriolar satellite protein PCM1, implicated in autophagy and centrosomal function, alters its dynamics in cells. Our data provides new mechanistic insight into how selective binding of LIR motifs to GABARAPs is achieved, and elucidate the overlapping and distinct functions of ATG8 subfamily proteins.

Date: 2019
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DOI: 10.1038/s41467-019-10059-6

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