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• Catalytic proteins, also known as enzymes, are catalysts that speed up chemical reactions.
• Defense proteins, such as immunoglobulins or antibodies, are used in the body's defense system.
• Transport proteins bind to a particular small biomolecule and transport them to other locations in the body, including hemoglobin, transferrin, HDL and LDL.
• Messenger proteins transmit signals to coordinate biochemical processes between different cells, tissues, and organs, including insulin, glucagon and human growth hormone.
• Contractile proteins, such as actin and myosin, are involved in muscle contraction.
• Structural proteins, like collagen and keratin, provide structure to the body.
• Transmembrane proteins control the movement of small molecules and ions through the cell membrane.
• Storage proteins bind and store small molecules for future use.
• Regulatory proteins are molecules that bind to enzymes.
• Nutrient proteins, such as casein and ovalbumin, are nutrient-rich proteins.