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Pubmed ID :23908376
Publication Date : //

The LIR motif - crucial for selective autophagy.


(Macro)autophagy is a fundamental degradation process for macromolecules and organelles of vital importance for cell and tissue homeostasis. Autophagy research has gained a strong momentum in recent years because of its relevance to cancer, neurodegenerative diseases, muscular dystrophy, lipid storage disorders, development, ageing and innate immunity. Autophagy has traditionally been thought of as a bulk degradation process that is mobilized upon nutritional starvation to replenish the cell with building blocks and keep up with the energy demand. This view has recently changed dramatically following an array of papers describing various forms of selective autophagy. A main driving force has been the discovery of specific autophagy receptors that sequester cargo into forming autophagosomes (phagophores). At the heart of this selectivity lies the LC3-interacting region (LIR) motif, which ensures the targeting of autophagy receptors to LC3 (or other ATG8 family proteins) anchored in the phagophore membrane. LIR-containing proteins include cargo receptors, members of the basal autophagy apparatus, proteins associated with vesicles and of their transport, Rab GTPase-activating proteins (GAPs) and specific signaling proteins that are degraded by selective autophagy. Here, we comment on these new insights and focus on the interactions of LIR-containing proteins with members of the ATG8 protein family.

Authors : Birgisdottir Åsa Birna , Lamark Trond , Johansen Terje ,

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