Proteins are amino acid polymers connected by peptidic bonds -covalent-. Amino acids are composed of a central carbon, one hydrogen atom, one carboxyl group (COOH), one amine group (NH₂), and one R group.
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According to this information, we could think about a protein.
These molecules are composed of amino acids joint by peptidic bonds.
A peptidic bond is a covalent bond between the carboxylic group and the amine group.
AMINO ACIDS
- Amino acids are organic molecules.
- They are composed of a central carbon, one hydrogen atom, one carboxyl group (COOH), one amine group (NH2), and one R group.
- The composition of the R group is what makes them different from each other.
PROTEINS
- Proteins are amino acid polymers linearly arranged and connected by peptidic bonds. These molecules characterize by their different structures.
- The number of amino acids composing the chain and the order in which they are arranged determines the primary structure of the protein.
PEPTIDIC BOND
- The peptidic bond is the union of two amino acids by their carboxyl and amine groups.
- When they get together, a water molecule is released, producing a covalent bond CO-NH.
- Peptidic bonds only form linear structures, with no ramifications, known as peptides.
- Every peptide has a free carboxyle group in one extreme and a free amine group in the other extreme.
In the attached files you will find the image of an amino acid and another image of a peptidic bond.
Remember that the R group is what determines the identity of the protein.
