cytochrome


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Related to cytochrome: cytochrome c, cytochrome oxidase, Cytochrome P450

cytochrome

 [si´to-krōm]
any of a class of hemoproteins, widely distributed in animal and plant tissue, whose main function is electron transport; distinguished according to their non–amino acid components as a, b, c, d, etc.

cy·to·chrome

(sī'tō-krōm),
A class of hemoprotein the principal biologic function of which is electron and/or hydrogen transport by virtue of a reversible valency change of the heme iron. Cytochromes are classified in four groups (a, b, c, and d) according to spectrochemical characteristics; many variants exist, particularly among bacteria and in green plants and algae, one being a variant of the c type cytochrome called cytochrome f. The mitochondrial system of cytochromes provides electron transport through cytochrome c oxidase to molecular oxygen as the terminal electron acceptor (respiration).
[cyto- + G. chrōma, color]

cytochrome

/cy·to·chrome/ (si´to-krōm) any of a class of hemoproteins, widely distributed in animal and plant tissues, whose main function is electron transport using the heme prosthetic group; distinguished according to their prosthetic groups, e.g., a, b, c, d, and P-450.

cytochrome

(sī′tə-krōm′)
n.
Any of a class of usually colored proteins that contain a heme group, are electron carriers, and catalyze oxidation-reduction reactions during cellular respiration.

cytochrome

[si′tōkrōm]
Etymology: Gk, kytos, cell, chroma, color
1 a class of hemoproteins whose function is electron transport. These proteins have the ability to change the valence of the heme iron, alternating between ferrous and ferric states.
2 proteins involved in mitochondrial electron transport systems associated with adenosine triphosphate (ATP) production.

cy·to·chrome

(sī'tō-krōm)
A class of hemoprotein the principal biologic function of which is electron or hydrogen transport by virtue of a reversible valency change of the heme iron. Many variants exist, particularly among bacteria and in green plants and algae, one being a variant of the c type cytochrome called cytochrome f. The mitochondrial system of cytochromes provides electron transport through cytochrome c oxidase to molecular oxygen as the terminal electron acceptor (respiration).
[cyto- + G. chrōma, color]

cytochrome

a protein pigment containing iron that is capable of being alternately oxidized and reduced, acting as an electron carrier in, for example, the ELECTRON TRANSPORT SYSTEM of a MITOCHONDRION.

Cytochrome

A substance that contains iron and acts as a hydrogen carrier for the eventual release of energy in aerobic respiration.
Mentioned in: Smoking

cy·to·chrome

(sī'tō-krōm)
A class of hemoprotein the principal biologic function of which is electron or hydrogen transport.
[cyto- + G. chrōma, color]

cytochrome (sī´təkrōm´),

n one of a class of hemoproteins that act as electron transport. Cytochromes are classified as
a, b, c, and
d.

cytochrome

any of a class of hemoproteins, widely distributed in animal and plant tissue, whose main function is electron transport; distinguished according to their prosthetic group as a, b, c and d.

cytochrome b5 reductase
a flavoprotein involved in the desaturation of fatty acids in the liver.
cytochrome oxidase
an a type cytochrome which contains copper and receives electrons from another cytochrome, of the c type, and transfers them to oxygen atoms allowing the oxygen to combine with hydrogen atoms to form water. A nutritional deficiency of copper leads to a general reduction in metabolic rate because of the absence of cytochrome oxidase a.
cytochrome system
the sum of cytochromes which play a part in the body's metabolic processes. Includes the cytochrome oxidases and cytochrome reductases.
References in periodicals archive ?
Grape seed extract inhibits growth and induces apoptotic death of prostate carcinoma DU145 cells via caspases activation accompanied by dissipation of mitochondrial membrane potential and cytochrome c release.
We obtained spectral interactions between Roundup or glyphosate and the active site of the purified cytochrome P450 aromatase by measuring the absorbance of the preparations from 375 to 475 nm.
Mouse cytochrome P450EF, representative of a new 1B subfamily of cytochrome P450s.
The partnership, initiated in June 1999, exploits Cytochroma's proprietary position on two key cytochrome P450 enzymes responsible for the breakdown of retinoic acid in humans, CYP26A and CYP26B.
Based on published reports on retinoic acid metabolism, the model postulated that dietary vitamin A (retinol) is converted first to retinal and then to retinoic acid by alcohol dehydrogenases and, possibly, by cytochrome P450 enzymes.
announced today that it has discovered the enzymatic function, including substrate and metabolic products, of human cytochrome P450TEC (Thymus Expressed Cytochrome) and uncovered its potential role in thymus function.
They further demonstrate that one of the enzymes, known as cytochrome P450 2A6, participates in this process by making aminoketone, NNK's precursor.
Several enzymes are involved in drug metabolism of which the most important ones are those belonging to the family of cytochrome P450.
The team used expression of cytochrome P450 1A (CYP1A) as a measure of exposure to the contaminants of interest.
6 million) in private equity financing to further advance the company's business and research objectives of discovering and developing novel therapeutics based on cytochrome P450-based metabolism.
The new test measures the activity of an enzyme known as cytochrome p450 3A4 (CYP 3A4), which breaks down, or metabolizes, docetaxel and many other drugs, says Paul B.
Mechanism-based inhibition of human cytochrome P450 1A1 by rhapontigenin.