Myoglobin

Myoglobin was the **first protein to have its three-dimensional structure determined by X-ray crystallography**:

Kendrew JC, Bodo G, Dintzis HM, Parrish RG, Wyckoff H, Phillips DC (1958) A Three-Dimensional Model of the Myoglobin Molecule Obtained by X-Ray Analysis. _Nature_ **181** (4610): 662-6.

For this achievement, John Kendrew shared the 1962 Nobel Prize in chemistry with Max Perutz.
http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1962/

"Myoglobin is an iron- and oxygen-binding protein found in the muscle tissue of vertebrates in general and in almost all mammals."
--http://en.wikipedia.org/wiki/Myoglobin

One STL file contains a representation of the protein in cartoon form with residues binding the heme group represented as spheres (in green in the images). A separate STL file contains the heme group itself (in red in the images). Model based on the Protein Data Bank entry 1MBN:
--http://www.pdb.org/pdb/explore/explore.do?pdbId=1mbn

Model created