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Deoxy (1hmd) and oxy (1hmo) forms of hemerythrin from Themiste dyscritum (sipunculid worm)

• 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?

Holmes, M. A., I. Le Trong, S. Turley, L. C. Sieker, and R. E. Stenkamp. 1991. Structures of deoxy and oxy hemerythrin at 2.0 Å resolution. J. Mol. Biol. 218:583-593.

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