Chapter 21, Problem 16A

Interpretation Introduction

Interpretation:

The function of the amino acid cysteine needs to be explained.

Concept introduction:

The tertiary structure of protein-- The tertiary structure of proteins formed with complex folding of the chain of amino acids. The polypeptides chains are connected with others and form a coiled tertiary structure of the protein.

Cysteine is a type of protein that contains the tertiary type of structure.

Answer to Problem 16A

Cysteine is a sulfur containing amino acid. With the help of the tertiary structure of cysteine provide the maintenance for other proteins present in the body.

Explanation of Solution

Cysteine is one of the amino acids contains sulfur. Disulfide bridges present between cysteine chains in peptides and proteins are known as the building block for the muscles. The tertiary structure of cysteine provides strength by the presence of more disulfide linkage. The tertiary structure of proteins contains the water repel end which is a hydrophobic end and hydrogen bonding. Cysteine can be further oxidized to form a dimer. It helps to maintain the primary structure of proteins.

Conclusion

The sulfur containing protein is cysteine composed of tertiary structure. The cysteine function as an oxidizing agent and it is very reactive due to the presence of sulfur atoms.