What type of protein is collagen?

Collagen is classified as an insoluble fibrous protein, which plays a crucial role in providing structural support to various tissues throughout the body. This type of protein is characterized by its long, rope-like structure that allows it to form fibers, which provide strength and resilience. Collagen is a key component of the extracellular matrix, found in connective tissues such as tendons, ligaments, cartilage, and the skin. Its fibrous nature allows it to withstand tensile forces, making it essential for maintaining the integrity of these tissues.

Other types of proteins mentioned—soluble globular proteins, insulin proteins, and structural membrane proteins—serve different functions and have distinct structures that do not align with the characteristics of collagen. Globular proteins are typically soluble and take on a rounded shape, while insulin is a specific globular protein involved in regulating blood sugar. Structural membrane proteins, on the other hand, are involved in forming or supporting cellular membranes. Understanding these differences highlights why collagen is accurately categorized as an insoluble fibrous protein.