What Is Cyclic Phosphorylation?

Cyclic phosphorylation is the type of phosphorylation that takes place when a cyclic electron transfer occurs. Phosphorylation is a part of photosynthesis that takes place when phosphate is added to the presence of light, and it is necessary to provide the energy needed to convert ADP to ATP during photosynthesis. Cyclic phosphorylation occurs naturally during the process of photosynthesis.

For cyclic phosphorylation to occur, a certain series of events is necessary. Some of the important conditions of cyclic phosphorylation are that only photosystem I is used and that the active reaction center is P700. Another necessary factor is that the electrons travel back to photosystem I. When the electrons are charged by absorbing light, they begin to shoot out of photosystem I, which begins the process.

Only ATP is produced as a result of cyclic phosphorylation. Photolysis, also known as water splitting, does not occur during cyclic phosphorylation. Also, it is important to note that oxygen is not involved in this process.

This process is important for the production of energy, but it does not help to sustain or create biological cells. However, cyclic photophosphorylation naturally occurs in chloroplasts and can help in providing the necessary ATP that is needed for carbohydrate synthesis to occur.