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Hsp-associated proteasomal plastid pre-protein degradation as a regulatory and quality control mechanism in plants

Project description

Protein homeostasis for improved crop resilience

Increasingly frequent climate and environmental disruptions are putting a strain on global food supply. Protein homeostasis is a delicate process that maintains balance in protein synthesis, folding, trafficking and degradation. Its disruption is linked to several diseases in metazoan species, but it’s even more critical in plants. With the support of the Marie Skłodowska-Curie Actions programme, the HAPPY-QC project will explore the evolutionarily conserved CHIP-Bag1-Hsp70 system (CHIP). This quality control mechanism for chloroplast protein import and the clearing of unimported or misfiled precursor proteins is an important part of the ubiquitin-proteasome system (UPS), which remains poorly understood. HAPPY-QC will lay the foundation for a better understanding of the UPS and enhance crop resilience.

Objective

Protein homeostasis is a delicate process which keeps the synthesis, folding, trafficking and degradation of proteins in balance. Its
disruption is linked to various diseases, including neurodegenerative disorders, cancer, and ageing in metazoan species. In plants,
protein homeostasis is critical for survival under environmental stresses like extreme temperatures, drought, and pathogen infections.
As the global population nears 8 billion, ensuring an adequate food supply is paramount, especially while coping with the adverse
effects of climate change. Chloroplasts (plastids), crucial organelles in plant cells, are responsible for producing most of the world's
food, and require the import of over 3000 different proteins for their proper function.
My research objective is to investigate the evolutionarily conserved CHIP-Bag1-Hsp70 system (CHIP), a vital quality control
mechanism for chloroplast protein import and clearing of unimported and misfolded precursor proteins. CHIP is part of the larger
Ubiquitin-Proteasome System (UPS). Despite its significance, CHIP's interactions and substrates in plants are poorly understood. The
goal of my research is to (1) identify CHIP interactors and substrates in plants, using techniques like affinity purification, proximity
labeling, and proteomics; (2) study the structural organization of these complexes and their interactions with substrates through
structural mass spectrometry; and (3) determine how these complexes interact with the proteasome using cryo-electron microscopy.
This research sheds light on an inadequately understood system crucial for chloroplast regulation and various biological processes. It
also lays the foundation for studying the UPS in important plant models. Ultimately, this work indirectly contributes to enhancing
crop resilience against diseases and heat stress, which is increasingly relevant in the context of global warming.

Fields of science (EuroSciVoc)

Keywords

Programme(s)

Topic(s)

Funding Scheme

HORIZON-TMA-MSCA-PF-EF - HORIZON TMA MSCA Postdoctoral Fellowships - European Fellowships

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Call for proposal

(opens in new window) HORIZON-MSCA-2024-PF-01

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Coordinator

THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD
Net EU contribution
€ 260 347,92
Address
WELLINGTON SQUARE UNIVERSITY OFFICES
OX1 2JD Oxford
United Kingdom
Region
South East (England) Berkshire, Buckinghamshire and Oxfordshire Oxfordshire
Activity type
Higher or Secondary Education Establishments
Links
Total cost
No data