Effect of trehalose on oxygen evolution and electron transfer in photosystem 2 complexes

Area of Science:

• Biochemistry
• Photosynthesis research
• Plant physiology

Background:

• Photosystem 2 (PS 2) is crucial for light-driven water oxidation and plastoquinone reduction.
• Understanding factors that stabilize PS 2 is vital for improving photosynthetic efficiency.

Purpose of the Study:

• To investigate the impact of the unique disaccharide trehalose on isolated PS 2 complexes.
• To determine how trehalose affects PS 2 activity, stability, and conformational states.

Main Methods:

• Studied isolated PS 2 complexes.
• Measured oxygen evolution rates.
• Analyzed single flash-induced fluorescence decay kinetics.
• Assessed PS 2 stability during prolonged storage.

Main Results:

• Trehalose significantly stimulated the steady-state rate of oxygen evolution.
• Trehalose did not alter QA(-) oxidation rates but increased the fraction of active PS 2 centers.
• Trehalose prevented inactivation of PS 2 complexes during storage.

Conclusions:

• Trehalose positively influences PS 2 function by affecting hydration and promoting optimal protein conformation.
• Trehalose enhances the stability and efficiency of isolated PS 2 complexes.
• Trehalose shows potential as a stabilizing agent for photosynthetic research.