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Sagot :
Phosphorylation is the addition of a phosphate group to a protein or other organic molecule.
Phosphorylation can increase the catalytic efficiency of an enzyme by converting it to its active form in proteins, whereas phosphorylation of other enzymes converts them to their inherently inefficient form.
Although the enzyme function most affected is protein catalytic efficiency, phosphorylation can also alter affinity for substrates, subcellular location, or responsiveness to regulation by allosteric ligands.
Phosphorylation activates or deactivates many protein enzymes that cause or inhibit the mechanism of action of diseases such as cancer and diabetes.
What is the Purpose of Phosphorylation?
-Phosphorylation plays an important regulatory role in cells. Its features are:
-Important for glycolysis.
-Used for protein-protein interactions
-It is used to break down protein.
-Modulate enzyme inhibition.
-Regulates chemical reactions that require energy to maintain homeostasis.
Types of phosphorylation
The three main types of phosphorylation are glucose phosphorylation, protein phosphorylation, and oxidative phosphorylation.
1.Glucose Phosphorylation
Glucose and other sugars are often phosphorylated as the first step in their degradation. For example, the first step in the glycolysis of D-glucose is its conversion to D-glucose-6-phosphate. Glucose is a small molecule that easily enters cells. Phosphorylation forms large molecules that cannot easily enter tissues. Therefore, phosphorylation is very important to regulate blood glucose concentration. Glucose concentration, in turn, is directly related to glycogen formation. Glucose phosphorylation is also associated with cardiac growth.
2.Protein Phosphorylation
Protein phosphorylation occurs when a phosphate group is added to an amino acid. Amino acids are usually serine, but phosphorylation also occurs in threonine and tyrosine in eukaryotes and histidine in prokaryotes. An esterification reaction in which a phosphate group reacts with a hydroxyl group (-OH) on a serine, threonine, or tyrosine side chain.
In addition to its importance in DNA repair, protein phosphorylation plays an important role in metabolic and signaling pathways.
3.Oxidative Phosphorylation
Oxidative phosphorylation is how cells store and release chemical energy. In eukaryotic cells, the reactions take place in the mitochondria. Oxidative phosphorylation consists of electron transfer chain reactions and chemiosmotic reactions.
In summary, redox reactions transfer electrons from proteins and other molecules along the electron transport chain of the inner mitochondrial membrane, releasing the energy used to make adenosine triphosphate (ATP) in chemiosmosis.
Learn about related information at https://brainly.ph/question/2440941
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