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quinone
quinone Chem. (ˈkwɪnəʊn, kwɪˈnəʊn) Also 9 kinone. [f. quin-a + -one.] a. spec. A crystalline compound (benzoquinone, C6H4O2), the simplest type of the class of quinones. b. Any one of a series of aromatic compounds derived from the benzene series of hydrocarbons when two hydrogen atoms are replaced ...
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Quinone
During this process, hydroquinone is oxidized to quinone. Structural analogues of quinones
Quinone methide - where one O is replaced by C
Xylylene - where both O's are replaced by C's
Quinone imine - where
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Ribosyldihydronicotinamide dehydrogenase (quinone)
Other names in common use include NRH:quinone oxidoreductase 2, NQO2, NQO2, NAD(P)H:quinone oxidoreductase-2 (misleading), QR2, quinone reductase 2, N-ribosyldihydronicotinamide dehydrogenase (quinone), and NAD(P)H:quinone oxidoreductase2 (misleading).
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Dihydroorotate dehydrogenase (quinone)
This enzyme catalyses the electron transfer from dihydroorotate (electron donor) to a quinone (electron acceptor):
(S)-dihydroorotate + quinone orotate This region of the protein is also thought to mediate quinone binding.
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Thiosulfate dehydrogenase (quinone)
In enzymology, a thiosulfate dehydrogenase (quinone) () is an enzyme that catalyzes the chemical reaction
2 thiosulfate + 2 6-decylubiquinone tetrathionate Other names in common use include thiosulfate:quinone oxidoreductase, thiosulphate:quinone oxidoreductase, thiosulfate oxidoreductase, tetrathionate-forming
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Malate dehydrogenase (quinone)
(S)-malate + a quinone oxaloacetate + reduced quinone
Thus, the two substrates of this enzyme are (S)-malate and a quinone, whereas its two products are oxaloacetate and reduced quinone.
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Quinate dehydrogenase (quinone)
Quinate dehydrogenase (quinone) (, NAD(P)+-independent quinate dehydrogenase, quinate:pyrroloquinoline-quinone 5-oxidoreductase) is an enzyme with systematic This enzyme catalyses the following chemical reaction
quinate + quinone 3-dehydroquinate + quinol
This enzyme is membrane-bound.
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Alcohol dehydrogenase (quinone)
Alcohol dehydrogenase (quinone) (, type III ADH, membrane associated quinohaemoprotein alcohol dehydrogenase) is an enzyme with systematic name alcohol :quinone oxidoreductase.
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Nitrate reductase (quinone)
, NarA, NarZ, NarGHI) is an enzyme with systematic name nitrite:quinone oxidoreductase. This enzyme catalyses the following chemical reaction
nitrate + a quinol nitrite + a quinone + H2O
This is a membrane-bound enzyme which supports [
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NADPH dehydrogenase (quinone)
The systematic name of this enzyme class is NADPH:(quinone-acceptor) oxidoreductase. (quinone).
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Pyruvate dehydrogenase (quinone)
Pyruvate dehydrogenase (quinone) (, pyruvate dehydrogenase, pyruvic dehydrogenase, pyruvic (cytochrome b1) dehydrogenase, pyruvate:ubiquinone-8-oxidoreductase
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Cyclic alcohol dehydrogenase (quinone)
Cyclic alcohol dehydrogenase (quinone) (, cyclic alcohol dehydrogenase, MCAD) is an enzyme with systematic name cyclic alcohol:quinone oxidoreductase. This enzyme catalyses the following chemical reaction
cyclic alcohol + quinone cyclic ketone + quinol
This enzyme oxidizes a wide variety of cyclic
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Pyrroloquinoline quinone
Pyrroloquinoline quinone (PQQ), also called methoxatin, is a redox cofactor and antioxidant. PqqB () oxidizes the 2 and 3 positions on the tyrosine ring, forming a quinone which quickly becomes AHQQ, finishing the pyridine ring.
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Quinone methide
There are some examples of transient synthetic meta quinone methides.
Properties
Quinone methides are cross-conjugated rather than aromatic. Quinone dimethides
A quinone dimethide (or "xylylene") is a compound with the formula C6H4(=CH2)2.
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NAD(P)H dehydrogenase (quinone)
In enzymology, a NAD(P)H dehydrogenase (quinone) () is an enzyme that catalyzes the chemical reaction
NAD(P)H + H+ + a quinone NAD(P)+ + a hydroquinone , NAD(P)H-quinone dehydrogenase, NAD(P)H-quinone oxidoreductase, NAD(P)H: (quinone-acceptor)oxidoreductase, NAD(P)H: menadione oxidoreductase, NADH-menadione
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