heme (hēm) an iron compound of protoporphyrin which constitutes the pigment portion or protein-free part of the hemoglobin molecule and is responsible for its oxygen-carrying properties.
Heme
heme
heme,
heme
heme (h m)n. The deep red, oxygen-carrying, nonprotein, ferrous component of hemoglobin. Also called reduced hematin. |
Heme
The iron-containing molecule in hemoglobin that serves as the site for oxygen binding.
heme
[hēm]
Etymology: Gk, haima, blood
the pigmented iron-containing nonprotein part of the hemoglobin molecule. There are four heme groups in a hemoglobin molecule, each consisting of a cyclic structure of four pyrrole residues, called protoporphyrin, and an atom of iron in the center. Heme binds and carries oxygen in the red blood cells, releasing it to tissues that give off excess amounts of CO2. Also spelled haeme. See also hemoglobin, porphobilinogen, protoporphyrin.
heme,
n the pigmented, iron-contain-ing, nonprotein portion of the hemoglobin molecule.
heme
the nonprotein, insoluble, iron protoporphyrin constituent of hemoglobin, of various other respiratory pigments, and of many cells, both animal and vegetable. It is an iron compound of protoporphyrin and so constitutes the pigment portion or protein-free part of the hemoglobin molecule, and is responsible for its oxygen-carrying properties.
heme pigment nephropathy
see hemoglobinuric nephrosis.
heme synthetase
the rate-controlling enzyme for the synthesis of heme.
heme
An iron-containing red pigment which, with a protein, globin, forms hemoglobin
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