Collagen is a protein that has what type of helix structure?

Collagen is a protein known for its unique triple helix structure, which is crucial for its strength and stability. This triple helix consists of three polypeptide chains that wind around each other, creating a sturdy and resilient configuration. The presence of glycine, proline, and hydroxyproline in the amino acid sequence is significant for maintaining this helicoidal structure. The glycine residues allow the polypeptide chains to closely pack together, while proline and hydroxyproline contribute to the stability and rigidity of the helix through their unique ring structures and hydrogen bonding.

This triple helical formation is essential for collagen's role in providing structural support in various tissues, such as skin, tendons, ligaments, and cartilage. The robust nature of the triple helix also plays a pivotal role in resisting tensile forces, making collagen a key component in maintaining the integrity of the extracellular matrix.