Redox partner interactions in the ATG8 lipidation system in microalgae.

Autor: Mallén-Ponce MJ; Institut de Biologie Paris-Seine, UMR 7238, CNRS, Sorbonne Université, 75005, Paris, France., Gámez-Arcas S; Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, 41092, Sevilla, Spain., Pérez-Pérez ME; Instituto de Bioquímica Vegetal y Fotosíntesis, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, 41092, Sevilla, Spain. Electronic address: eperez@ibvf.csic.es.
Jazyk: angličtina
Zdroj: Free radical biology & medicine [Free Radic Biol Med] 2023 Jul; Vol. 203, pp. 58-68. Date of Electronic Publication: 2023 Apr 06.
DOI: 10.1016/j.freeradbiomed.2023.04.004
Abstrakt: Autophagy is a catabolic pathway that functions as a degradative and recycling process to maintain cellular homeostasis in most eukaryotic cells, including photosynthetic organisms such as microalgae. This process involves the formation of double-membrane vesicles called autophagosomes, which engulf the material to be degraded and recycled in lytic compartments. Autophagy is mediated by a set of highly conserved autophagy-related (ATG) proteins that play a fundamental role in the formation of the autophagosome. The ATG8 ubiquitin-like system catalyzes the conjugation of ATG8 to the lipid phosphatidylethanolamine, an essential reaction in the autophagy process. Several studies identified the ATG8 system and other core ATG proteins in photosynthetic eukaryotes. However, how ATG8 lipidation is driven and regulated in these organisms is not fully understood yet. A detailed analysis of representative genomes from the entire microalgal lineage revealed a high conservation of ATG proteins in these organisms with the remarkable exception of red algae, which likely lost ATG genes before diversification. Here, we examine in silico the mechanisms and dynamic interactions between different components of the ATG8 lipidation system in plants and algae. Moreover, we also discuss the role of redox post-translational modifications in the regulation of ATG proteins and the activation of autophagy in these organisms by reactive oxygen species.
Competing Interests: Declaration of competing interest The authors declare that there is no conflict of interest.
(Copyright © 2023. Published by Elsevier Inc.)
Databáze: MEDLINE
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