heme

H0142500 (hēm)n. A deep red, iron-containing compound, C₃₄H₃₂FeN₄O_4, that constitutes the nonprotein component of hemoglobin and certain other proteins.

[Short for hematin.]

heme

(him)

n. an unstable, deep red, iron-containing blood pigment, C₃₄H₃₂N₄O₄Fe, obtained from hemoglobin. [1920–25; shortening of hemoglobin]

Thesaurus

Noun

heme - a complex red organic pigment containing iron and other atoms to which oxygen bindshaem, haemitin, hematin, protohemepigment - dry coloring material (especially a powder to be mixed with a liquid to produce paint, etc.)haemoglobin, Hb, hemoglobin - a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues; "fish have simpler hemoglobin than mammals"myoglobin - a hemoprotein that receives oxygen from hemoglobin and stores it in the tissues until neededcytochrome - (biochemistry) a class of hemoprotein whose principal biological function is electron transfer (especially in cellular respiration)

heme

heme:

see coenzymecoenzyme
, any one of a group of relatively small organic molecules required for the catalytic function of certain enzymes. A coenzyme may either be attached by covalent bonds to a particular enzyme or exist freely in solution, but in either case it participates intimately in
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Heme

the nonprotein component (the so-called prosthetic group) and the coloring matter of hemoglobin.

Chemically, heme is a compound of protoporphyrin and divalent iron. In the vertebrate body heme is synthesized from simpler nitrogen compounds (glycine and succinate) and from ferritin, a reserve iron-protein complex present in the spleen, liver, and bone marrow. The heme isolated from the blood of various vertebrates always has the same structure:

Free heme readily oxidizes in air to hematin, in which the iron atom is trivalent. Many years of research on the structure of heme were rewarded by the synthesis in 1929 by H. Fischer of hemin, the hydrochloride of heme.

heme

[hēm] (biochemistry) C₃₄H₃₂O₄N₄Fe An iron-protoporphyrin complex associated with each polypeptide unit of hemoglobin.

heme

[hēm] 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 and constitutes the pigment portion or protein-free part of the hemoglobin molecule, and is responsible for its oxygen-carrying properties.

heme

(hēm), 1. The porphyrin chelate of iron in which the iron is Fe(II) (or Fe²⁺); the oxygen-carrying, color-furnishing, prosthetic group of hemoglobin. 2. Iron complexed with nonporphyrins but related tetrapyrrole structures (for example, biliverdin heme). 3. Iron chelated with any porphyrin, irrespective of the valence state of the iron atom. Synonym(s): ferroheme, ferroprotoporphyrin, reduced hematin [G. haima, blood]

heme

(hēm)n. A deep red, iron-containing compound, C₃₄H₃₂FeN₄O_4, that constitutes the nonprotein component of hemoglobin and certain other proteins.

heme

An iron-containing red pigment which, with a protein, globin, forms hemoglobin

heme

(hēm) 1. The porphyrin chelate of iron in which the iron is Fe(II) (Fe²⁺); the oxygen-carrying, color-furnishing, prosthetic group of hemoglobin. 2. Iron complexed with nonporphyrins but related tetrapyrrole structures (e.g., biliverdin heme).
Synonym(s): reduced hematin, haem. [G. haima, blood]

heme

see HAEM.

Heme

The iron-containing molecule in hemoglobin that serves as the site for oxygen binding.Mentioned in: Porphyrias, Sickle Cell Disease, Thalassemia

heme

(hēm) 1. The oxygen-carrying, color-furnishing, prosthetic group of hemoglobin. 2. Iron complexed with nonporphyrins but related tetrapyrrole structures.
Synonym(s): reduced hematin, haem. [G. haima, blood]

Acronym

Definition

heme➣Hemorrhage (medical)

heme➣Hemorrhage Early MRI Evaluation

heme➣Hall Effect Measurement Equipment (UK)

heme➣High-Efficiency Mist Eliminator

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Synonyms for heme

noun a complex red organic pigment containing iron and other atoms to which oxygen binds

Synonyms

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