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Eric C. Niederhoffer, Ph.D. Associate Professor of Biochemistry and Molecular Biology Southern Illinois University School of Medicine 600 Agriculture Drive, Carbondale, IL 62901-6503 Rm 112 Lindegren, 618-453-6467 eniederhoffer@siumed.edu Copyright 2000- , E.C. Niederhoffer. All Rights Reserved. All trademarks and copyrights are the property of their respective owners.

Deoxy (1lla) and oxy (1nol) forms of hemocyanin from Limulus polyphemus (horseshoe crab)

• What structural elements are present in each molecule?
• What is the subunit composition?
• What is the coordination geometry about the metal ion?
• What is the distance between metal ions?
• What changes occur upon oxygenation?

Hazes, B., K. A. Magnus, C. Bonaventura, J. Bonaventura, Z. Dauter, K. H. Kalk, and W. G. Hol. 1993. Crystal structure of deoxygenated Limulus polyphemus subunit II hemocyanin at 2.18 Å resolution: clues for a mechanism for allosteric regulation. Protein Sci. 2:597-619.

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