Protein function

Protein Function

A protein is a complex molecule that performs a vast array of functions within organisms, including humans. The function of a protein is determined by its structure, which is in turn dictated by the amino acid sequence that makes up the protein.

Structure and Function

Proteins are made up of one or more polypeptide chains, each of which is composed of a sequence of amino acids. The sequence of a protein is unique and determines the structure and function of the protein. The structure of a protein can be divided into four levels: primary structure, secondary structure, tertiary structure, and quaternary structure.

Types of Protein Functions

Proteins perform a vast array of functions within organisms. These functions can be broadly categorized into the following types:

• Enzymatic Functions: Proteins can act as enzymes, which are catalysts that speed up chemical reactions in the body.

• Structural Functions: Some proteins provide structure to cells and organisms.

• Transport Functions: Proteins can carry molecules from one place to another within the body.

• Motor Functions: Some proteins are involved in mechanical work, such as muscle contraction and intracellular transport.

• Signaling Functions: Proteins can transmit signals within cells and between cells.

• Immune Response Functions: Proteins play a crucial role in the immune response, including the production of antibodies.

Protein Function and Disease

When proteins do not function properly, it can lead to a variety of diseases. For example, sickle cell disease is caused by a single amino acid substitution in the protein hemoglobin.

See Also

• Protein biosynthesis
• Protein folding
• Protein–protein interaction
• Protein targeting