Alpha-Helix Protein Structure Diagram | Biochemistry Visual Guide #3645154 (License: Personal Use)

This schematic depicts a right-handed alpha-helix, a common secondary structure in proteins, where the polypeptide backbone coils into a helical shape stabilized by hydrogen bonds between the carbonyl oxygen (red) of residue *i* and the amide hydrogen (white) of residue *i+4*. Each amino acid is represented by its α-carbon (black), backbone atoms (N, C, O), and variable R-group side chain. The dashed red lines indicate intrahelical hydrogen bonds that maintain structural integrity.

Used in biochemistry, molecular biology, and education websites or textbooks to explain protein folding, secondary structure formation, and the role of hydrogen bonding in stabilizing helices. Matches user intent for learning or teaching protein architecture.