cytochrome

cytochrome (sĪˈtəkrōmˌ) [key], protein containing heme (see coenzyme) that participates in the phase of biochemical respiration called oxidative phosphorylation. Cytochromes act as carriers of hydride ions (sometimes considered to be the equivalent of electron pairs) in the series of complex enzymes known as the electron transport chain. As the hydride ions or their equivalent travel along the electron transport chain, each cytochrome is in turn reduced (accepts a hydride ion or pair of electrons) and then oxidized (donates the hydride ion or pair of electrons to the next acceptor in the chain); in the process the iron atom in the cytochrome heme shuttles between the ferrous and ferric states. The cytochromes were discovered in 1886.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

More on cytochrome from Fact Monster:

  • Ernst Jaffé - Biography of Ernst Jaffé, Ernst Jaffé was a doctor and hematologist who worked on a type of hereditary anemia that impairs red blood cells from transporting oxygen. W…
  • phosphorylation - phosphorylation phosphorylation, chemical process in which a phosphate group is added to an organic ...
  • coenzyme - coenzyme coenzyme , any one of a group of relatively small organic molecules required for the ...
  • Encyclopedia: Biochemistry - Encyclopeadia articles concerning Biochemistry.
  • Specialized Cell Structure and Function: Cellular Respiration - Specialized Cell Structure and Function Cellular Respiration Specialized Cell Structure and ...

See more Encyclopedia articles on: Biochemistry