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- W2117977428 abstract "We examined the effects of tagetitoxin, a potent inhibitor of RNA polymerases from chloroplasts and Escherichia coli, on the transcriptional activities of chloroplast- and proplastid-nuclei (nucleoids) isolated from mature tobacco (Nicotiana tabacum L.) leaves and cultured tobacco cells (line BY-2), respectively. Transcription by the isolated chlo-roplast-nuclei was effectively inhibited by tagetitoxin (95–99% reduction at 10 μM tagetitoxin), but transcription by the isolated proplastid-nuclei was only partially inhibited (40–50% reduction) by this compound. Southern hybridization experiments revealed that the transcription of various plastid genes (psbA, atpA, rpoB, psaA/B, atpB, rbcL, petB, rpl16, and rrn23) was sensitive to tagetitoxin in the isolated chloroplast-nuclei, whereas the transcription of the same genes was relatively resistant to this compound in the isolated proplastid-nuclei. These results suggest that; (i) distinct RNA polymerase activities with different sensitivities to tagetitoxin are present in plastids, (ii) a tagetitoxin-sensitive RNA polymerase is the major RNA polymerase in chloroplasts whereas a tagetitoxin-insensitive enzyme is major in proplastids, and (iii) both RNA polymerases can transcribe various plastid genes." @default.
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- W2117977428 date "1998-09-01" @default.
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- W2117977428 title "Transcriptional Activities of the Chloroplast-Nuclei and Proplastid-Nuclei Isolated from Tobacco Exhibit Different Sensitivities to Tagetitoxin: Implication of the Presence of Distinct RNA Polymerases" @default.
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- W2117977428 doi "https://doi.org/10.1093/oxfordjournals.pcp.a029456" @default.
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