Modification of oxygen evolving center by Tris-washing

Area of Science:

• Photosynthesis research
• Chloroplast biophysics

Background:

• The oxygen-evolving center (OEC) is crucial for photosynthesis.
• Tris-washing is a common method to study the OEC and photosystem II (PSII).

Purpose of the Study:

• To review the application of Tris-washing in photosynthetic investigations.
• To discuss the mechanism and site of Tris-inactivation.
• To explore reactivation strategies for Tris-washed samples.

Main Methods:

• Tris-washing of chloroplasts and sub-chloroplast particles.
• Analysis of photosystem II (PSII) properties.
• Spectroscopic techniques to study fluorescence and delayed light emission.

Main Results:

• Tris-washing specifically and reversibly inhibits the OEC.
• Detailed mechanisms of Tris-inactivation and its effects on PSII components (P680, Z) are discussed.
• Reactivation is possible through specific chemical and photochemical treatments.

Conclusions:

• Tris-washing is a valuable tool for dissecting OEC and PSII function.
• Understanding inactivation and reactivation is key for interpreting experimental results.
• This review provides a comprehensive overview for researchers in photosynthesis.