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Nitric oxide suppresses the energy transduction of plant mitochondria

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Title: Nitric oxide suppresses the energy transduction of plant mitochondria
Authors: Shimoji, H. Browse this author
Sakihama, Y. Browse this author →KAKEN DB
Yamasaki, H. Browse this author
Keywords: alternative oxidase
nitrate reductase
nitric oxide
oxidative stress
Issue Date: 1-Feb-2002
Publisher: CSIRO
Citation: PS2001 Proceedings : 12th International Congress on Photosynthesis, Aug 18-23 2001, Brisbane, Australia
Journal Title: Proceedings of the 12th International Congress on Photosynthesis
Volume: 3
Issue: 1
Start Page: S29-007
Abstract: Plant mitochondria are known to possess two respiratory electron transport pathways, i.e. the cytochrome and alternative pathways. The cytochrome pathway, which ends at cytochrome c oxidase (COX), is almost identical to the respiratory electron transport pathway in animal mitochondria. The alternative pathway, which ends at alternative oxidase (AOX), is unique in plants, fungi and parasitic protozoa. Although thermogenesis has been considered as a possible role for alternative pathway. the physiological significance of this non-energy producing pathways is not fully understood. Millar and Day (1996) have proposed that the alternative pathway may play an important role in preventing oxidative damage induced by nitric oxide (NO). Nitric Oxide (NO) is a free radical that can act as a signal messenger in animal cells (Packer 1996). It has been known that NO sometimes disturbs the energy transduction system in animal mitochondria by inhibiting the activity of COX (Brookes e al. 1999), In contrast to extensive knowledge on biochemistry and physiology on NO in animal systems, the source and role of NO in plants have been not yet confirmed. We have recently revealed that plant nitrate reductase (NR) is capable of converting nitrite to NO in the presence of NADH (Yamasaki, Sakihama 2000; Yamasaki 2000). NR is a key enzyme in nitrate assimilation pathway. By using the NR-catalyzed NO production system, here we demonstrate in vitro effects of NO on the energy transduction system of mitochondria. The results presented in this study provide substantial evidence to confirm that the plant alternative pathway is resistant to NO>
Conference Name: International Congress on Photosynthesis
Conference Sequence: 12
Conference Place: Brisbane
Rights: (C)CSIRO Publishing
Type: proceedings (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 崎浜 靖子

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