Abstract
-
1.
Monothiophosphate was used as a probe for substrate level phosphorylation, mitochondrial oxidative phosphorylation, and membrane permeability.
-
2.
Thiophosphate does not support ATP synthesis either in mitochondria or model enzymic reactions, conservation of oxidative energy occurring through formation of ATP(γ)S.
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3.
Thiophosphoryl transfer is slower compared to phosphoryl (group) transfer. Such behavior is compatible with an addition-elimination mechanism.
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4.
Thiophosphate accumulates in mitochondria by an energydependent process and substitutes for phosphate in the catalysis of metabolite transport. Relative to phosphate, a slower and less extensive permeation was observed.
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Abbreviations
- TMPD:
-
N,N,N',N'-tetramethyl-p-phenylene-diamine dihydrochloride
- MES:
-
2 (N-morpholino)ethane sulfonic acid
- TES:
-
N-tris (Hydroxymethyl) methyl-2-aminomethane sulfonic acid
- PEI:
-
polyethyleneimine
- ATP(γ)S:
-
thiophosphoryl ADP
- DTT:
-
dithiothreitol
- RLM:
-
rat liver mitochondria
- SP:
-
thiophosphate
- GAPDH:
-
glyceraldehyde-3-phosphate dehydrogenase
- PGK:
-
phosphoglycerate kinase
- MOPS:
-
morpholinopropane sulfonic acid.
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Tavares de Sousa, J., Packer, L. & Schonbaum, G.R. Thiophosphate as a probe for mitochondrial oxidative phosphorylation, model phosphorylation reactions and membrane permeability. J Bioenerg Biomembr 3, 539–552 (1972). https://doi.org/10.1007/BF01539063
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DOI: https://doi.org/10.1007/BF01539063