Anaerobic respiration coupled with mitochondrial fatty acid synthesis in wax ester fermentation by Euglena gracilis. Issue 24 (30th October 2018)

• Record Type: Journal Article
• Authors: Nakazawa, Masami; Ando, Hiroko; Nishimoto, Ayusa; Ohta, Tsuyoshi; Sakamoto, Kimitoshi; Ishikawa, Takahiro; Ueda, Mitsuhiro; Sakamoto, Tatsuji; Nakano, Yoshihisa; Miyatake, Kazutaka; Inui, Hiroshi
• Is Part Of: FEBS letters. Volume 592:Issue 24(2018)
• Page Start: 4020
• Page End: 4027
• Publication Date: 2018-10-30
• Subjects: anaerobic respiration -- Euglena gracilis -- mitochondrial electron transfer system -- mitochondrial fatty acid synthesis -- wax ester fermentation; Biochemistry -- Periodicals; Biophysics -- Periodicals; Molecular biology -- Periodicals; Biochimie -- Périodiques; Biochemistry; Biophysics; Molecular biology; Periodicals; 572.05
• DOI: 10.1002/1873-3468.13276
• Languages: English
• ISSNs: 0014-5793

Abstract

Abstract : In Euglena gracilis, wax ester fermentation produces ATP during anaerobiosis. Here, we report that anaerobic wax ester production is suppressed when the mitochondrial electron transport chain complex I is inhibited by rotenone, whereas it is increased by the uncoupler carbonyl cyanide m ‐chlorophenylhydrazone (CCCP). The ADP/ATP ratio in anaerobic cells is elevated by treatment with either rotenone or CCCP. Gene silencing experiments indicate that acyl‐CoA dehydrogenase, electron transfer flavoprotein (ETF), and rhodoquinone (RQ) participate in wax ester production. These results suggest that fatty acids are synthesized in mitochondria by the reversal of β‐oxidation, where trans ‐2‐enoyl‐CoA is reduced mainly by acyl‐CoA dehydrogenase using the electrons provided by NADH via the electron transport chain complex I, RQ, and ETF, and that ATP production is highly supported by anaerobic respiration utilizing trans ‐2‐enoyl‐CoA as a terminal electron acceptor. Abstract :