Arabidopsis metacaspase MC1 localizes in stress granules, clears protein aggregates and delays senescence

Ruiz-Solaní, Nerea (author), Van Midden, Katarina Petra (author), Klemenčič, Marina (author), S. Coll, Nuria (author)

Stress granules (SGs) are highly conserved cytoplasmic condensates that assemble in response to stress and contribute to maintaining protein homeostasis. These membraneless organelles are dynamic, disassembling once the stress is no longer present. Persistence of SGs due to mutations or chronic stress has been often related to age-dependent protein-misfolding diseases in animals. Here, we find that the metacaspase MC1 is dynamically recruited into SGs upon proteotoxic stress in Arabidopsis (Arabidopsis thaliana). Two predicted disordered regions, the prodomain and the 360 loop, mediate MC1 recruitment to and release from SGs. Importantly, we show that MC1 has the capacity to clear toxic protein aggregates in vivo and in vitro, acting as a disaggregase. Finally, we demonstrate that overexpressing MC1 delays senescence and this phenotype is dependent on the presence of the 360 loop and an intact catalytic domain. Together, our data indicate that MC1 regulates senescence through its recruitment into SGs and this function could potentially be linked to its remarkable protein aggregate-clearing activity.

• Language: English
• Keywords: stress granules, biomolecular condensates, protein aggregates, metacaspases, heat stress, senescence
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: Str. 3325–3344
• Numbering: Vol. 35, iss. 9
• PID: 20.500.12556/RUL-152407
• UDC: 577.15
• ISSN on article: 1040-4651
• DOI: 10.1093/plcell/koad172
• COBISS.SI-ID: 157990915
• Publication date in RUL: 23.11.2023

Record is a part of a journal

• Title: The Plant cell
• Shortened title: Plant cell
• Publisher: American Society of Plant Physiologists
• ISSN: 1040-4651
• COBISS.SI-ID: 28940033

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: stresne granule, biomolekularni kondenzati, proteinski agregati, metakaspaze, toplotni stres, staranje