What Function Do Proteins Serve?

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Proteins are essential molecules that help cells to function. They are made up of amino acids and help to build, maintain, and repair the body’s tissues. Proteins are also needed to make enzymes and hormones, and they play an important role in metabolism. But what are the specific functions of proteins?

Main Functions of Proteins

Proteins are responsible for a variety of functions in the body, including:

  • Structural components: Proteins are important structural components of cells, organs, and tissues. They provide the framework for the body to grow, develop, and repair itself.
  • Catalysts: Proteins act as catalysts, or enzymes, in the body. These enzymes help to speed up chemical reactions that would otherwise be too slow to occur.
  • Receptors: Proteins act as receptors for hormones and other molecules in the body. They bind to these molecules and help to transmit messages between cells.
  • Transport: Proteins act as transporters, carrying molecules and ions from one place to another in the body.
  • Immunity: Proteins are important for the body’s immune system. They help to identify foreign molecules and attack them before they can cause damage.

What Is Not A Function of Proteins?

Proteins are important molecules in the body, but they are not capable of all functions. One function that proteins are not capable of is storing energy. This is because proteins are not a good storage form of energy, and they do not contain enough energy to be used as a fuel source by the body.

In addition, proteins are not capable of generating energy. This is because proteins are not capable of producing ATP, which is the molecule that is used to store and release energy in the body. This means that proteins cannot be used as a direct source of energy for the body.


Proteins are essential molecules for the body, but they are not capable of all functions. They are important structural components, catalysts, receptors, transporters, and for the immune system. However, proteins are not capable of storing energy or generating energy.

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