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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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