What is the chemical nature of enzymes? Describe the structure of the enzyme and its each center

Enzymes are protein in nature, moreover, they are globular proteins
The substrate (adsorption) center is the site of the active center of the enzyme where sorption (binding) of the substrate molecule takes place. SC is formed by one, two, more often three amino acid radicals, which are usually located near the catalytic center. The main function of SC is the binding of the substrate molecule and its transfer to the catalytic center in
the most convenient position for him.
The active center is formed from amino acid residues that are part of different sections of the polypeptide chain or of various closely related polypeptide chains. It is formed at the level of the tertiary structure of the protein enzyme. Within it, a substrate (adsorption) center and a catalytic center are distinguished. In addition to the active center, there are special functional areas – allosteric (regulatory) centers. Regulatory (allosteric center) is a site of an enzyme molecule outside its active center, which reversibly binds to any substance. Such binding leads to a change in the conformation of the enzyme molecule and its activity. The active center either starts to work faster or slower. Accordingly, such substances are called allosteric activators or allosteric inhibitors.

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