Summary
This pre-print characterises a citrus-specific post-translational mechanism regulating the antioxidant enzyme CsGPX4. Overexpression of CsGPX4 in Citrus sinensis induced a truncated proteoform with altered membrane localisation and reduced enzymatic activity, in contrast to the full-length protein produced in Nicotiana benthamiana. The authors propose that citrus employs species-specific proteolytic processing to protect redox homeostasis under oxidative stress, potentially operating as a regulatory feedback mechanism.
Regional applicability
This is a molecular cell biology study using model transgenic plants and does not directly address United Kingdom citrus cultivation or soil health practices. Citrus is not a primary commercial crop in the United Kingdom climate; findings may be relevant to citrus breeders and pathologists internationally seeking to enhance stress tolerance in perennial woody crops, but transferability to UK temperate horticulture would be indirect.
Key measures
CsGPX4 proteoform identity (immunoblot, MALDI-TOF), subcellular localisation patterns, glutathione peroxidase enzymatic activity, intracellular ROS levels, proteomic pathway profiling
Outcomes reported
The study characterised citrus-specific post-translational truncation of CsGPX4 and its impact on subcellular localisation, enzymatic activity, and intracellular ROS accumulation. Proteomic profiling revealed reprogramming of redox detoxification, cytoskeleton organisation, hormone signalling, and stress response pathways.
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