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. 1990 Jul 11;18(13):3689–3696. doi: 10.1093/nar/18.13.3689

Transfer RNAs of potato (Solanum tuberosum) mitochondria have different genetic origins.

L Maréchal-Drouard 1, P Guillemaut 1, A Cosset 1, M Arbogast 1, F Weber 1, J H Weil 1, A Dietrich 1
PMCID: PMC331066  PMID: 2374706

Abstract

Total transfer RNAs were extracted from highly purified potato mitochondria. From quantitative measurements, the in vivo tRNA concentration in mitochondria was estimated to be in the range of 60 microM. Total potato mitochondrial tRNAs were fractionated by two-dimensional polyacrylamide gel electrophoresis. Thirty one individual tRNAs, which could read all sense codons, were identified by aminoacylation, sequencing or hybridization to specific oligonucleotides. The tRNA population that we have characterized comprises 15 typically mitochondrial, 5 'chloroplast-like' and 11 nuclear-encoded species. One tRNA(Ala), 2 tRNAs(Arg), 1 tRNA(Ile), 5 tRNAs(Leu) and 2 tRNAs(Thr) were shown to be coded for by nuclear DNA. A second, mitochondrial-encoded, tRNA(Ile) was also found. Five 'chloroplast-like' tRNAs, tRNA(Trp), tRNA(Asn), tRNA(His), tRNA(Ser)(GGA) and tRNA(Met)m, presumably transcribed from promiscuous chloroplast DNA sequences inserted in the mitochondrial genome, were identified, but, in contrast to wheat (1), potato mitochondria do not seem to contain 'chloroplast-like' tRNA(Cys) and tRNA(Phe). The two identified tRNAs(Val), as well as the tRNA(Gly), were found to be coded for by the mitochondrial genome, which again contrasts with the situation in wheat, where the mitochondrial genome apparently contains no tRNA(Val) or tRNA(Gly) gene (2).

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