Canadian Medical Guide > Chemicals and Drugs > Enzymes and Coenzymes > Cytochromes > Cytochrome b Group Terms and Definitions

Cytochrome b Group

Medical Definition:	Cytochromes (electron-transporting proteins) with protoheme (HEME B) as the prosthetic group.
Guide Notes:	/biosyn /physiol permitted; spell in titles & translations with lowercase b: cytochrome b; do not confuse with CYTOCHROMES B
Previously Indexed:	Cytochromes (1966-1982)

Cytochrome b Group Categories.

	Cytochromes b - Cytochromes of the b group that have alpha-band absorption of 563-564 nm. They occur as subunits in MITOCHONDRIAL ELECTRON TRANSPORT COMPLEX III.
	Cytochromes b5 - Cytochromes of the b group that are found bound to cytoplasmic side of ENDOPLASMIC RETICULUM. They serve as electron carrier proteins for a vareirty of membrane-bound OXYGENASES. They are reduced by the enzyme CYTOCHROME-B(5) REDUCTASE.
	Cytochromes b6 - Cytochromes of the b group that are found as components of the CYTOCHROME B6F COMPLEX. They contain two non-covalently bound HEME B groups.

Cytochrome b Group Medical Definitions and Terms

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