3D Protein Structure Viewer

Explore real protein structures in interactive 3D. Rotate, zoom, and examine molecular details.

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Loading Hemoglobin...

PDB ID: 1A3N

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H

Hemoglobin

PDB: 1A3NTransport1.8 ƅ

Oxygen transport protein found in red blood cells. This tetrameric protein consists of 4 subunits (2 alpha and 2 beta chains), each containing a heme group.

Key Facts

  • ā€¢Tetramer with 4 subunits
  • ā€¢Contains iron-bearing heme groups
  • ā€¢Exhibits cooperative oxygen binding

Structure Details

Size:574 amino acids total
PDB ID:1A3N
Resolution:1.8 ƅ
ā† Learn more about common proteins|Understanding protein structure ā†’

Visualization Guide

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Cartoon

Shows secondary structure (helices, sheets, loops)

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Stick

Shows all atoms and bonds

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Sphere

Space-filling model showing atomic radii

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Surface

Molecular surface for binding sites

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Line

Wireframe showing connectivity

Color Schemes Explained

By Chain:

Each protein chain gets a unique color

Spectrum:

Rainbow from N-terminus (blue) to C-terminus (red)

Secondary:

Helices (red), sheets (yellow), loops (green)

Residue:

Colors by amino acid type

Atom:

CPK coloring: C(gray), O(red), N(blue), S(yellow)