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| {{MitoPedia
| | #REDIRECT [[Electron-transfer-pathway state]] |
| |description=[[File:SUITp-Catg NFSGpTm.jpg|right|300px]]
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| '''Substrate types''' in SUIT protocols are types of reduced substrates feeding electrons into the [[electron transfer system]] (ETS) at different levels of mitochondrial pathways. Substrates of type 1 may be artificial electron donors essentially bypassing the ETS and feeding electrons directly into the terminal electron acceptor, cytochrome c oxidase (CIV) or alternative oxidases (single enzymatic step). Substrates of type 2 feed electrons into Complex III (CIII) with further electron transfer downstream of the [[Q-junction]]. Substrates of type 3 feed electrons into respiratory complexes directly upstream of the Q-junction, whereas substrates of type 4 feed electrons into dehydrogenases and enzyme systems upstream of the type 3 pathway level.
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| {{MitoPedia concepts
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| |mitopedia concept=MitoFit Quality Control System
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| {{MitoPedia methods}}
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| {{MitoPedia SUIT
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| |mitopedia SUIT=SUIT protocol
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| {{MitoPedia topics
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| |mitopedia topic=Substrate and metabolite
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| * On the pathway level of converging NADH- and FADH<sub>2</sub>-linked dehydrogenases, including the TCA cycle and beta-oxidation:
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| :'''N:''' [[NADH]]-linked substrates (CI-linked)
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| :'''F:''' [[FADH2 |FADH<sub>2</sub>]]-linked substrates (FAO)
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| * On the pathway level of electron transfer complexes converging at the Q-junction:
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| :'''S:''' [[Succinate]] (CII-linked)
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| :'''Gp:''' [[Glycerophosphate]] (CGpDH-linked)
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| * On the single step level of cytochrome ''c'' oxidase (CIV), the terminal step in the aerobic electron transfer system:
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| :'''Tm:''' Artificial electron transfer susbstrate [[TMPD]] (Tm) maintained in a reduced state by [[ascorbate]] (As) and reducing cytochrome ''c'' as the substrate of [[CIV]].
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