Thioredoxin targets in plants: the first 30 years

Area of Science:

• Plant biology
• Redox biology
• Molecular biology

Background:

• The turn of the century marked significant advancements in redox biology, particularly in plants.
• Proteomics enabled the identification of thioredoxin (Trx)-linked proteins, initially in chloroplasts and expanding to other cellular compartments.

Purpose of the Study:

• To summarize the progress in identifying thioredoxin targets in oxygenic photosynthetic organisms.
• To highlight the broad regulatory roles of thioredoxin in cellular processes and stress responses.

Main Methods:

• Proteomic approaches were employed to identify thioredoxin targets.
• Two key procedures were utilized: thiol-specific probes and mutant thioredoxin proteins.
• Biochemical and genetic methods are currently used to confirm newly identified targets.

Main Results:

• The number of identified thioredoxin targets in land plants increased tenfold, from under 40 to over 400.
• An additional 100 targets were found in green algae and cyanobacteria, totaling 500 in oxygenic photosynthetic organisms.
• These targets influence nearly all major cellular processes and play roles in coping with oxidative stress.

Conclusions:

• Thioredoxin plays a fundamental role in regulating diverse cellular processes.
• Thioredoxin targets are crucial for plants to adapt to changing environments, especially during oxidative stress.
• Further research will continue to elucidate the functional details of thioredoxin-mediated regulation.