Cytochrome: Difference between revisions
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'''Cytochromes''' are [[haemoprotein]]s (or [[proteins]] containing [[haem]] groups). They make [[Adenosine triphosphate|ATP]] by [[electron transport]]. |
'''Cytochromes''' are [[haemoprotein]]s (or [[proteins]] containing [[haem]] groups). They make [[Adenosine triphosphate|ATP]] by [[electron transport]]. |
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They are found either as |
They are found either as single (monomeric) proteins (e.g., [[cytochrome c]]) or as part of bigger [[enzyme]] complexes which catalyze [[redox]] reactions. |
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== History == |
== History == |
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Revision as of 13:03, 30 October 2015
Cytochromes are haemoproteins (or proteins containing haem groups). They make ATP by electron transport.
They are found either as single (monomeric) proteins (e.g., cytochrome c) or as part of bigger enzyme complexes which catalyze redox reactions.
History
Cytochromes were described in 1884 by MacMunn as respiratory pigments (myohematin or histohematin).[1][2] In the 1920s, Keilin rediscovered these respiratory pigments. He called them the cytochromes, or “cellular pigments”, and classified them as haem proteins.
Types
Several kinds of cytochrome exist and can be distinguished by spectroscopy. Three types of cytochrome are distinguished by their prosthetic groups.[3] In mitochondria and chloroplasts, these cytochromes are often combined in electron transport and related metabolic pathways.
References
- ↑ A respiratory pigment increases the oxygen-carrying ability of the blood.
- ↑ MacMunn C.A. (1886). "Researches on myohaematin and the histohaematins". Philosophical Transactions of the Royal Society of London. 177 (0). The Royal Society: 267–298. doi:10.1098/rstl.1886.0007. JSTOR 109482.
- ↑ Prosthetic group = add-on bit which makes it work