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Difference between revisions of "Q-junction"

From Bioblast
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== Related pages in Bioblast ==
== Related MitoPedia pages ==
:::* '''Electron transfer system, ETS'''
::* '''Electron transfer system, ETS'''
:::: [[Electron transfer system]]
::::» [[Electron transfer system]]
:::: [[Q-junction]]
::::» [[Q-junction]]


:::* '''Pathway control state'''
::* '''Pathway control states'''
:::: [[Pathway control state]]  
::::» [[Pathway control state]]


:::* '''Coupling control state ''E'''''
::* '''Coupling control state ''E'''''
:::: [[ETS capacity]]
::::[[File:E.jpg |link=ETS capacity]] [[ETS capacity]]
:::: [[Noncoupled respiration]]
::::» [[Noncoupled respiration]]
::::» [[Uncoupler#Is_respiration_uncoupled_-_noncoupled_-_dyscoupled.3F |Is respiration uncoupled - noncoupled - dyscoupled?]]

Revision as of 15:14, 17 February 2017


high-resolution terminology - matching measurements at high-resolution


Q-junction

Description

Q-junction

The Q-junction is a junction for convergent electron flow in the electron transfer system (ETS) 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 glycoreophosphate (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 CIV. The concept of the Q-junction, with the N-junction and F-junction upstream, provides the rationale for defining pathway control 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.

Q-junction
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.


More details: »Respiratory complexes - more than five
» O2k-Publications: Q-junction effect


Related MitoPedia pages

  • Electron transfer system, ETS
» Electron transfer system
» Q-junction
  • Pathway control states
» Pathway control state
  • Coupling control state E
E.jpg ETS capacity
» Noncoupled respiration
» Is respiration uncoupled - noncoupled - dyscoupled?