Big Idea: The shape of a protein determines its function! 🌟

• Fibrous Proteins 🧵
• Globular Proteins 🌐

• Structure: Long and thread-like.
• These don't fold like those intricate origami projects! They're more straightforward.
• Unlike other proteins, they skip the fancy twists and turns of alpha helices.

📖 Example: Collagen

• Unique Feature: Made of three polypeptides twisted like a braid (triple helix).
• Basic Structure: It's like a repeating song chorus of three amino acids: P–G–X. Sing it!
  • P: Proline or hydroxyproline, which hates forming α-helices.
  • G: Glycine. Think of it as a minimalist; its R-group is tiny!
  • X: A wildcard! It changes and allows various collagen forms.

🌍 Real-world relevance: Collagen is like nature's rope. It's super strong, found in our skin, tendons, ligaments, the eyes' outer coat, and more.