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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.
Hemerythrin (1hmd)
deoxy
Hemerythrin (1hmo)
oxy
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Asp106, Glu58, His25, His54, His73,
His77, His101
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Asp106, Glu58, His25, His54, His73,
His77, His101 and one bound peroxide ligand
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