Protein Structure Visualization - Heme-Binding Multimer with Ribbon Diagram #3712121 (License: Personal Use)

This molecular visualization shows a symmetric quaternary protein structure composed of four distinct subunits-red, yellow-green, blue-purple, and orange-arranged around a central heme prosthetic group. The heme is depicted as a porphyrin ring with a central iron atom (gray sphere), coordinating to histidine residues from adjacent chains. Secondary structural elements like α-helices and loops are rendered in smooth ribbons to emphasize topology and spatial organization.

Used in educational platforms, scientific publications, and bioinformatics tools to illustrate protein quaternary structure, ligand binding, and allosteric regulation-particularly for hemoglobin-like oxygen-binding proteins. Matches user intent for learning structural biology or visualizing enzyme-cofactor interactions.