Dissociation of cytochrome oxidase-carbon monoxide complex in complete darkness

In the leaves of a number of plant species, dissociation of CO from the active site of cytochrome a 3-CO complex in complete darkness was observed when excess O 2 was supplied. This was detected by direct O 2 uptake and by the in vivo nitrate reductase test. Thus, in contrast to animal mitochondria,...

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Veröffentlicht in:	Phytochemistry (Oxford) 1991, Vol.30 (4), p.1061-1063
Hauptverfasser:	Naik, R.M., Munjal, S.V., Desal, B.B., Naik, M.S., Singh, P., Mehta, S.L.
Format:	Artikel
Sprache:	eng
Schlagworte:	Alternative oxidase Biological and medical sciences carbon dioxide carbon monoxide Cell structures and functions Cenchrus americanus CO effects cytochrome oxidase cytochrome-c oxidase dissociation of cytochrome a3-CO complex enzyme activity Fundamental and applied biological sciences. Psychology gas exchange leaves light Mitochondria and cell respiration Molecular and cellular biology nitrate reductase oxidation oxygen Pennisetum americanum Sorghum bicolor Spinacea oleracea Spinacia oleracea Triticum aestivum
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Beschreibung
Zusammenfassung:	In the leaves of a number of plant species, dissociation of CO from the active site of cytochrome a 3-CO complex in complete darkness was observed when excess O 2 was supplied. This was detected by direct O 2 uptake and by the in vivo nitrate reductase test. Thus, in contrast to animal mitochondria, in plants the cytochrome a 3-CO complex appears to be quite unstable, even in the dark.
ISSN:	0031-9422 1873-3700
DOI:	10.1016/S0031-9422(00)95172-0