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Functional characterization of the gene cluster from Pseudomonas syringae pv. phaseolicola NPS3121 involved in synthesis of phaseolotoxin
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Aguilera S López-López K Nieto Y Garcidueñas-Piña R Hernández-Guzmán G Hernández-Flores JL Murillo J Alvarez-Morales A 《Journal of bacteriology》2007,189(7):2834-2843
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The tRNA-coding locus of the 8.2-kilobase pair (kbp) Eco RI fragments Eco G of Euglena gracilis Klebs, strain Z Pringsheim chloroplast DNA was chosen for detailed analysis. Two recombinant plasmids, pPG14, containing Eco G and the vector pMB9, and pEZC23, containing the chloroplast DNA fragment HindIII B cloned in pBR322 were employed for the study. The tRNA locus was mapped to an 0.8-kbp region of Eco G also present in HindIII B. The DNA sequence of a 1.6 kbp from HindIII B, containing the entire tRNA gene locus was determined. Four tRNA genes were identified from the DNA sequence. The gene organization is tRNAVal-16 bp spacer-tRNAAsn-3 bp spacer-tRNAArg-45 bp spacer-tRNALeu. The tRNALeu gene is of the opposite polarity as the other three genes. This is the first evidence of such a tRNA cluster for a chloroplast genome. Also evident from the DNA sequence, 132 bp from the 5'-end of the tRNALeu gene, is a putative gene or pseudogene for a chloroplast protein. 相似文献
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