Linked Life Data

11943457

Source:http://linkedlifedata.com/resource/pubmed/id/11943457

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pubmed-article:11943457pubmed:dateCreated2002-4-10lld:pubmed
pubmed-article:11943457pubmed:abstractTextThe divergent transcription of two tRNA genes encoded in sunflower mitochondrial DNA, proposed as genes of different genetic origin, has been studied in detail. The transcription initiation site (TIS) for both transcript precursors has been identified by hybridization with in vitro (32)P-capped total RNAs and primer extension. The location of two TISs and the analysis of distribution of sequence elements (motifs) usually present in higher plant mitochondrial promoters led to the identification of two short regions (about 30-40 bp) which can be proposed as the promoters for the transcription of two genes. This conclusion is supported by the observation that within the short intergenic region included between the 5' termini of two genes (1924 bp) the distribution of those specific motifs is unique around the TISs, although not identical for the two promoters. Based on specific experimental results the trnE promoter shows a higher efficiency in comparison with that of the trnH promoter. This result is in good agreement with its structure which strictly conforms to those described for mitochondrial genes of dicot plants. Instead the other promoter shows some divergences which could be responsible for its lower efficiency. The context in which trnH lies in the sunflower mitochondrial genome and other features described in the paper may suggest that, despite the high similarity with the chloroplast counterpart, the trnH gene could have a native origin.lld:pubmed
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pubmed-article:11943457pubmed:authorpubmed-author:DamianoFabriz...lld:pubmed
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pubmed-article:11943457pubmed:pagination25-32lld:pubmed
pubmed-article:11943457pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:11943457pubmed:year2002lld:pubmed
pubmed-article:11943457pubmed:articleTitleTranscription of two sunflower (Helianthus annuus L.) mitochondrial tRNA genes having different genetic origins.lld:pubmed
pubmed-article:11943457pubmed:affiliationDipartimento di Biochimica e Biologia Molecolare, Università di Bari, via Orabona 4, 70126 Bari, Italy.lld:pubmed
pubmed-article:11943457pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11943457pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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