Amino acid of cystine, cysteine and methionine

Among the 20 amino acids that constitute the primary structure of proteins, methionine and cysteine, contain a sulphur atom.

Therefore, methionine, cysteine and cystine are the principle sources of sulphur in the body.

Cystine, cysteine and methionine are source of a part of the structure of insulin and the keratin of hair and are involved with oxidation-reduction reactions in the body.

While protein eaten in excess of that required for growth or cellular repair may be utilized as a source of energy, it is not considered that they are efficiently utilized for this purpose.

Cystine is a dimer of cysteine, in which the two cysteine residues are connected via disulfide bond. This due to cysteine is unstable in solution and readily oxidized to the dimer form.

Methionine is an essential amino acid and has to be supplied in the diet. Cysteine is not essential can be synthesized in the body from methionine. The presence of cysteine and cystine in the diet reduces the requirement of methionine.
Amino acid of cystine, cysteine and methionine

Methionine

Methionine, is a sulfur containing amino acid that is essential for human and animal nutrition. It is required for DNA-RNA structure, collagen and each cell’s protein syntheses function.

It has relatively low profile and is not present in high concentrations throughout the body.

Methionine is a nonpolar amino acid. Like other hydrophobic amino acids, it can play a role in binding or recognition of hydrophobic ligands such as lipids.

It is the most abundant sulfur containing amino acid and the principal supplier of sulfur to man and animals.

Methionine helps remove heavy metals from the tissues. For example, lead is one heavy metal which causes brain damage.

It helps in the breakdown of fat, thus helping ro prevent a buildup of fat in the liver and arteries that might obstruct blood flow to the brain, heart and kidney.

Methionine high sulfur content helps supply the body with the acidity it needs to stave off chronic disease states that may result when the body’s alkaline to acid is too high.

This amino acid helps the digestive system; helps to detoxify harmful agents such as lead and other heavy metals; helps diminish muscle weakness, prevent brittle hair and protect against radiation and it beneficial for people with osteoporosis or chemical allergies.

Methionine