Q-junction: Difference between revisions
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{{MitoPedia | {{MitoPedia | ||
|description=[[File:SUIT-catg FNSGp.jpg|right|300px|Q-junction]] | |description=[[File:SUIT-catg FNSGp.jpg|right|300px|Q-junction]] | ||
The '''Q-junction''' is a junction for [[convergent electron flow]] in the [[Electron transfer | The '''Q-junction''' is a junction for [[convergent electron flow]] in the [[Electron transfer pathway]] (ET-pathway) from type N substrates and mt-matix dehydrogenases through [[Complex I]] (CI), from type F substrates and FA oxidation through [[electron-transferring flavoprotein complex]] (CETF),Β from succinate (S) through [[Complex II]] (CII), from glycerophosphate (Gp) through [[glycerophosphate dehydrogenase complex]] (CGpDH), from choline through [[choline dehydrogenase]], from dihydro-orotate through [[dihydro-orotate dehydrogenase]], and other enzyme complexes into the Q-cycle (ubiquinol/ubiquinone), and further downstream to [[Complex III]] (CIII) and [[Complex IV]] (CIV). The concept of the Q-junction, with the [[N-junction]] and [[F-junction]] upstream, provides the rationale for defining [[Electron-transfer-pathway state]]s and [[categories of SUIT protocols]]. | ||
|info=[[Gnaiger 2009 Int J Biochem Cell Biol]], [[Gnaiger 2014 MitoPathways]] | |info=[[Gnaiger 2009 Int J Biochem Cell Biol]], [[Gnaiger 2014 MitoPathways]] | ||
}} | }} | ||
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::::Β» [[Dihydro-orotate dehydrogenase]] | ::::Β» [[Dihydro-orotate dehydrogenase]] | ||
::::Β» [[Electron-transferring flavoprotein complex]] Β | ::::Β» [[Electron-transferring flavoprotein complex]] Β | ||
::::Β» [[Electron transfer | ::::Β» [[Electron transfer pathway]] Β | ||
::::Β» [[F-junction]] Β | ::::Β» [[F-junction]] Β | ||
::::Β» [[Glycerophosphate dehydrogenase complex]] Β | ::::Β» [[Glycerophosphate dehydrogenase complex]] Β | ||
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== Related MitoPedia pages == | == Related MitoPedia pages == | ||
::* '''Electron transfer | ::* '''Electron transfer pathway, ET-pathway''' | ||
::::Β» [[Electron transfer | ::::Β» [[Electron transfer pathway]] | ||
::::Β» [[Q-junction]] | ::::Β» [[Q-junction]] | ||
Revision as of 14:12, 8 June 2020
Description
The Q-junction is a junction for convergent electron flow in the Electron transfer pathway (ET-pathway) from type N substrates and mt-matix dehydrogenases through Complex I (CI), from type F substrates and FA oxidation through electron-transferring flavoprotein complex (CETF), from succinate (S) through Complex II (CII), from glycerophosphate (Gp) through glycerophosphate dehydrogenase complex (CGpDH), from choline through choline dehydrogenase, from dihydro-orotate through dihydro-orotate dehydrogenase, and other enzyme complexes into the Q-cycle (ubiquinol/ubiquinone), and further downstream to Complex III (CIII) and Complex IV (CIV). The concept of the Q-junction, with the N-junction and F-junction upstream, provides the rationale for defining Electron-transfer-pathway states and categories of SUIT protocols.
Reference: Gnaiger 2009 Int J Biochem Cell Biol, Gnaiger 2014 MitoPathways
MitoPedia concepts:
MiP concept,
SUIT concept
MitoPedia methods:
Respirometry
MitoPedia topics:
Enzyme
Contributed by Gnaiger E 2010-08-15; edited 2016-02-12, 2016-03-28.
- Convergent NS-linked electron flow at the Q-junction, exerting an additive effect on flux, versus electron gaiting for separation of single N- and S-input pathways (upper panel: Gnaiger 2009; lower panel: Hatefi 1962 J Biol Chem-XLII). Modified Fig. 1.5 in Gnaiger 2014 MitoPathways.
- Β» Keywords
- Specific
- General
- Β» Categories of SUIT protocols
- Β» Choline dehydrogenase
- Β» Complex I
- Β» Complex II
- Β» Dihydro-orotate dehydrogenase
- Β» Electron-transferring flavoprotein complex
- Β» Electron transfer pathway
- Β» F-junction
- Β» Glycerophosphate dehydrogenase complex
- Β» N-junction
- Β» NS-linked electron flow
- Β» Electron-transfer-pathway states
- General
Related MitoPedia pages
- Electron transfer pathway, ET-pathway
- Electron-transfer-pathway state
- Coupling control state E
SUITbrowser question: Q-junction
- Several SUIT protocols can be used to answer questions on additivity, or convergence of electron flow to the Q-junction.
- The SUITbrowser can be used to find the best SUIT protocols for different research questions, among those: