Protein synthesis in isolated mitochondria of rice (Oryza sativa L.) seedlings

For studies of in organello mitochondrial protein synthesis in rice, Oryza sativa L., conventional surface-sterilization procedures were demonstrated to be ineffective. Because of the over-whelmingly efficient [35S]methionine utilization by contaminating bacteria, even "essentially bacteria-fre...

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Veröffentlicht in:Plant physiology (Bethesda) 1991-05, Vol.96 (1), p.319-323
Hauptverfasser: Dai, H, Lo, Y S, Wu, C Y, Tsou, C L, Hsu, G S, Chern, C G, Ruddat, M, Chiang, K S
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Sprache:eng
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Zusammenfassung:For studies of in organello mitochondrial protein synthesis in rice, Oryza sativa L., conventional surface-sterilization procedures were demonstrated to be ineffective. Because of the over-whelmingly efficient [35S]methionine utilization by contaminating bacteria, even "essentially bacteria-free" rice mitochondria were shown to be unsuitable for the study of in organello protein synthesis. We developed a procedure to obtain a bacteria-free preparation of rice mitochondria. Such mitochondria favored a membrane-dependent ATP-generating system over an external ATP-generating system as the energy supplement for in organello protein synthesis. Two distinct classes of [35S]methionine-labeled, cycloheximide-insensitive products were detected: an electrophoretically unresolved population and a set of some 22 to 27 discrete polypeptide species, each with a characteristic electrophoretic mobility and relative abundance.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.96.1.319