Article: Co-regulation of mitochondrial respiration by proline dehydrogenase/oxidase and succinate
Amino acids. 2016 Mar., v. 48, no. 3
2016
Abstract: Proline dehydrogenase/oxidase (PRODH/POX) is a mitochondrial protein critical to multiple stress pathways. Because of the roles of PRODH/POX in signaling, and its shared localization to the mitochondrial inner membrane with the electron transport chain ( ... ...
Abstract | Proline dehydrogenase/oxidase (PRODH/POX) is a mitochondrial protein critical to multiple stress pathways. Because of the roles of PRODH/POX in signaling, and its shared localization to the mitochondrial inner membrane with the electron transport chain (ETC), we investigated whether there was a direct relationship between PRODH/POX and regulation of the ETC. We found that PRODH/POX binds directly to CoQ1 and that CoQ1-dependent PRODH/POX activity required functional Complex III and Complex IV. PRODH/POX supported respiration in living cells during nutrient stress; however, expression of PRODH/POX resulted in an overall decrease in respiratory fitness. Effects on respiratory fitness were inhibited by DHP and NAC, indicating that these effects were mediated by PRODH/POX-dependent reactive oxygen species (ROS) generation. PRODH/POX expression resulted in a dose-dependent down-regulation of Complexes I–IV of the ETC, and this effect was also mitigated by the addition of DHP and NAC. We found that succinate was an uncompetitive inhibitor of PRODH/POX activity, inhibited ROS generation by PRODH/POX, and alleviated PRODH/POX effects on respiratory fitness. The findings demonstrate novel cross-talk between proline and succinate respiration in vivo and provide mechanistic insights into observations from previous animal studies. Our results suggest a potential regulatory loop between PRODH/POX and succinate in regulation of mitochondrial respiration. |
---|---|
Keywords | animals ; dose response ; electron transport chain ; mitochondrial membrane ; proline ; reactive oxygen species ; succinic acid |
Language | English |
Dates of publication | 2016-03 |
Size | p. 859-872. |
Publishing place | Springer Vienna |
Document type | Article |
ZDB-ID | 1121341-3 |
ISSN | 1438-2199 ; 0939-4451 |
ISSN (online) | 1438-2199 |
ISSN | 0939-4451 |
DOI | 10.1007/s00726-015-2134-7 |
Database | NAL-Catalogue (AGRICOLA) |
Full text online
More links
Kategorien
In stock of ZB MED Cologne/Königswinter
Zs.A 3490: Show issues | Location: Je nach Verfügbarkeit (siehe Angabe bei Bestand) bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular Jg. 1995 - 2021: Lesesall (2.OG) ab Jg. 2022: Lesesaal (EG) |
Order via subito
This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.