A type of pigment protein, it is the hemoglobin of invertebrates. Like hemoglobin, it is an oxygen carrier. It is formed when a prosthetic group called hemoferrin, which consists of a divalent iron atom and a peptide, is bound to a globin-like protein. It exists in the blood cells of the annelid worm, the starworm. It binds to one oxygen molecule for every three iron atoms, changing its color from colorless or pale yellow to reddish brown. It differs from hemoglobin in that it does not bind to carbon monoxide. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
色素蛋白質の一種で,無脊椎動物の血色素。ヘモグロビンと同様に酸素の運搬体。2価鉄原子とペプチドから成るヘモフェリン hemoferrinといわれる補欠分子族が,グロビン様蛋白質と結合したもの。環形動物のホシムシの血球中に存在する。鉄3原子に対し酸素1分子の割合で結合するが,その際無色または微黄色から赤褐色に変る。一酸化炭素とは結合しない点が,ヘモグロビンなどと異なる。
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