Protein Conformational Change: Extended vs Folded States #1404204 (License: Personal Use)

This ribbon diagram illustrates two conformational states of a protein: (A) an extended, partially unfolded form with a prominent red α-helix at the terminus, and (B) a compact, native-folded structure where the red helices are integrated into the core. The green ribbons represent the main polypeptide backbone, while red highlights functionally critical secondary structural elements involved in binding or catalysis.

Used in molecular biology textbooks, research presentations, and educational websites to explain protein folding dynamics, allosteric regulation, or domain rearrangement upon ligand binding. Matches user intent for visual learning about structural biology concepts.