Question

Choose the correct non-protein amino acid
a. Hydroxyproline
b. Hydroxylysine
c. Cystine
d. Gamma amino butyric acid

Answer 1

Hint: Amino acids are multifunctional organic compounds containing at least one group of amino acids and one group of carboxylic acids bound to a central carbon atom, the lateral chains of which may differ in length, branching and content of other functional groups or aromatic rings. Amino acids can form various molecular structures where their general classification makes the relative location of the amino and carboxyl functions.

Complete answer:
> Option A:
Hydroxyproline is a non-essential amino acid derivative produced by the enzyme prolyl hydroxylase, which requires vitamin C as a cofactor, during post-translational protein modification by hydroxylation of the amino acid proline. Hydroxyproline is a major collagen part of the protein and plays a key role in the stabilisation of the triple helix of collagen. It can be used to assess the amount of collagen as an indicator.

> Option B:
Hydroxylysine is a special glucogenic amino acid present in collagen, the principal structural protein of the skin and connective tissue of mammals, and in some related structural plant proteins. The hydroxyl hydroxylysine group forms a chemical bond with sugars, binding the protein to galactose monosaccharides and glucose-galactose disaccharides, thereby leading to the unusual strength and resilience of collagen.

> Option C:
Cystine is an amino acid containing sulphur that is obtained by the oxidation of two molecules of cysteine that are then bound by a disulfide bond. As a human metabolite and a metabolite of the mouse, it has a function. It is an organic disulfide, a sulfur-containing amino acid and a cysteine derivative

> Option D:
Gamma aminobutyric acid (GABA) is an amino acid that exists naturally and acts in the brain as a neurotransmitter. As chemical messengers, neurotransmitters act. Gamma amino butyric acid is an amino acid which is not a protein. It is a bioactive component of fruits, vegetables, cereals and, in animals, it functions in the brain as an inhibitory neurotransmitter, expressed in non-neuronal cells as well.

Hence, the correct answer is option (D).

Note: It causes a relaxing effect when GABA binds to a protein in your brain known as a GABA receptor. With feelings of anxiety, tension, and terror, this can help. The avoidance of seizures can also benefit. In recent years, GABA has also become a common supplement as a consequence of these properties. This is partially because certain food sources do not have it. Fermented ones, such as kimchi, miso, and tempeh, are the only foods containing GABA.