| Literature DB >> 29653079 |
W T Willis1, D Miranda-Grandjean2, J Hudgens3, E A Willis4, J Finlayson5, E A De Filippis6, R Zapata Bustos7, P R Langlais8, C Mielke9, L J Mandarino10.
Abstract
The adenine nucleotide translocase (ANT) of the mitochondrial inner membrane exchanges ADP for ATP. Mitochondria were isolated from human vastus lateralis muscle (n = 9). Carboxyatractyloside titration of O2 consumption rate (Jo) at clamped [ADP] of 21 μM gave ANT abundance of 0.97 ± 0.14 nmol ANT/mg and a flux control coefficient of 82% ± 6%. Flux control fell to 1% ± 1% at saturating (2 mM) [ADP]. The KmADP for Jo was 32.4 ± 1.8 μM. In terms of the free (-3) ADP anion this KmADP was 12.0 ± 0.7 μM. A novel luciferase-based assay for ATP production gave KmADP of 13.1 ± 1.9 μM in the absence of ATP competition. The free anion KmADP in this case was 2.0 ± 0.3 μM. Targeted proteomic analyses showed significant acetylation of ANT Lysine23 and that ANT1 was the most abundant isoform. Acetylation of Lysine23 correlated positively with KmADP, r = 0.74, P = 0.022. The findings underscore the central role played by ANT in the control of oxidative phosphorylation, particularly at the energy phosphate levels associated with low ATP demand. As predicted by molecular dynamic modeling, ANT Lysine23 acetylation decreased the apparent affinity of ADP for ANT binding.Entities:
Keywords: Acetylation; Bioenergetics; Energy metabolism; Flux control
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Year: 2018 PMID： 29653079 PMCID： PMC6919326 DOI： 10.1016/j.abb.2018.04.006
Source DB: PubMed Journal: Arch Biochem Biophys ISSN： 0003-9861 Impact factor: 4.013