Hemocyanin
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Hemocyanins are proteins that transport oxygen throughout the bodies of some invertebrate animals. These metalloproteins contain two copper atoms that reversibly bind a single oxygen molecule. They ar
Single oxygenated functional unit from the hemocyanin of an octopus
Crystal structure of hexameric haemocyanin from Panulirus interruptus refined at 3.2 angstroms resolution
crystallographic analysis of oxygenated and deoxygenated states of arthropod hemocyanin shows unusual differences
The underside of the carapace of a red rock crab (Cancer productus). The purple coloring is caused by hemocyanin.
Horseshoe crab
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Horseshoe crabs are arthropods of the family Limulidae and the only surviving xiphosurans. Despite their name, they are not crabs or even crustaceans; they are chelicerates, more closely related to ar
Hemocyanin
…steric conformation changes in the protein complex, which increases hemoglobin's affinity for oxygen when partially oxygenated. In some hemocyanins of horseshoe crabs and some other species of arthropods, cooperative binding is observed, with Hill coefficients of 1.6–3.0. Hill coefficients vary depending on species…
Limulus polyphemus horseshoe crab on coast
Tachypleus gigas
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Horseshoe crabs have two primary compound eyes and seven secondary simple eyes. Two of the secondary eyes are on the underside.