Phosphorylation

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Phosphorylation

Definition of Phosphorylation:

Formation of a phosphate derivative of a biomolecule, usually by enzymatic transfer of a phosphate group from ATP

Types of Phosphorylation:
 
1) Photophosphorylation or photosynthetic phosphorylation.

a) Cyclic photophosphorylation
b) Noncyclic photophosphorylation

2) Substrate level photophosphorylation.
3) Oxidative phosphorylation.

A) Photophosphorylation: The enzymatic formation of ATP from ADP coupled to the light dependent transfer of electrons in photosynthetic cells.

a) Cyclic photophosphorylation – ATP synthesis driven by cyclic electron flow through photosystem I.
b) Non cyclic photophosphorylation – The expelled electrons do not return to the chlorophyll.

B) Substrate Level Phosphorylation: Phosphorylated substrates donate inorganic phosphate to produce ATP (Non oxidative)

C) Oxidative phosphorylation: (linked to electron transport). The enzymatic phosphorylation of ADP to A TP coupled to electron transfer, from a substrate to molecular oxygen.

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