Proteomic Changes in Antioxidant System in Strawberry During Ripening

Area of Science:

• Plant Biochemistry
• Molecular Biology
• Fruit Ripening Studies

Background:

• Strawberry fruit ripening involves complex biochemical changes.
• Antioxidant defense systems play a crucial role in fruit development and quality.
• Understanding these systems is vital for improving fruit characteristics.

Purpose of the Study:

• To investigate the strawberry antioxidant defense system during fruit ripening.
• To quantify changes in antioxidant enzyme proteins during strawberry fruit development.
• To identify key enzymes involved in strawberry's oxidative stress response during ripening.

Main Methods:

• Development of a targeted quantitative proteomic approach using multiple reaction monitoring (MRM).
• Investigation of 46 proteins and isoforms with 73 identified peptides related to the antioxidant enzyme system.
• Comparative analysis of protein expression levels during different stages of strawberry fruit ripening.

Main Results:

• Aldo/keto reductase (AKR), superoxide dismutase (SOD), and glutathione transferase (GT) protein levels increased significantly during ripening.
• Dehydroascorbate reductase, 2-Cys peroxiredoxin, catalase (CAT), 1-Cys peroxiredoxin, and L-ascorbate peroxidase (APX) protein levels decreased significantly.
• The study identified specific changes in key antioxidant enzymes, indicating a shift in the defense strategy during ripening.

Conclusions:

• Strawberry fruit ripening activates enzymes within the superoxide dismutase (SOD)/glutathione metabolism system.
• The observed changes in antioxidant enzymes suggest a dynamic regulation of oxidative stress during fruit development.
• The developed proteomic methodology is applicable for studying antioxidant enzymes in other fruit ripening processes.