Multiple functions of CALCOCO family proteins in selective autophagy

Area of Science:

• Cell Biology
• Molecular Biology
• Autophagy Research

Background:

• Selective autophagy degrades specific cellular components via receptors.
• CALCOCO proteins (CALCOCO1, CALCOCO2/NDP52, CALCOCO3/TAX1BP1) are newly identified selective autophagy receptors.
• These receptors are crucial for targeting various cargos for lysosomal degradation.

Purpose of the Study:

• To review the structural, distributional, and post-translational characteristics of CALCOCO family proteins.
• To analyze the phylogenetic relationships among CALCOCO proteins.
• To elucidate the diverse roles of CALCOCO proteins in different selective autophagy pathways.

Main Methods:

• Literature review and analysis of existing research on CALCOCO proteins.
• Examination of protein structures, cellular localization data, and post-translational modifications.
• Phylogenetic analysis to understand evolutionary relationships.
• Review of functional studies implicating CALCOCO proteins in selective autophagy.

Main Results:

• CALCOCO1 mediates ER-phagy and Golgiphagy by interacting with ER and Golgi components.
• CALCOCO2 and CALCOCO3 act as cargo receptors for mitophagy and xenophagy.
• These receptors bind ubiquitin and interact with autophagy-related-8/microtubule-associated protein 1 light chain 3 (ATG8/LC3) for autophagosome formation.

Conclusions:

• CALCOCO proteins represent a significant class of selective autophagy receptors with distinct and overlapping functions.
• Understanding CALCOCO proteins is key to comprehending the regulation of selective autophagy.
• Further research into CALCOCO proteins could reveal new therapeutic targets for diseases involving protein aggregation or organelle dysfunction.