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  • 1
    Online Resource
    Online Resource
    San Diego :Elsevier Science & Technology,
    Keywords: Mitochondria. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (485 pages)
    Edition: 1st ed.
    ISBN: 9780123944429
    Series Statement: Issn Series
    Language: English
    Note: Front Cover -- Advances in Botanical Research -- Mitochondrial Genome Evolution -- Copyright -- Contents -- Contributors -- Preface -- Contents of Volumes 35-62 -- Chapter One - Mitochondrial and Eukaryotic Origins: A Critical Review -- 1. INTRODUCTION -- 2. THE EVOLUTION OF EUKARYOTES IS ONE OF SYMBIOTIC RELATIONSHIPS -- 3. A SINGLE ORIGIN OF MITOCHONDRIA? -- 4. TRADITIONAL HYPOTHESES ON THE ORIGIN OF EUKARYOTES AND MITOCHONDRIA -- 5. SYMBIOGENESIS HYPOTHESES ON THE ORIGIN OF EUKARYOTES -- 6. IMPLICATIONS OF THE SYMBIOGENESIS HYPOTHESES -- 7. THE QUEST FOR THE ROOT OF THE EUKARYOTIC TREE FROM A MITOCHONDRIAL PERSPECTIVE -- 8. DID EUKARYOTES EMERGE FROM WITHIN ARCHAEA OR VICE VERSA? -- 9. CONCLUSIONS -- GLOSSARY -- ACKNOWLEDGEMENTS -- REFERENCES -- Chapter Two - Gene Content and Gene Transfer from Mitochondria to the Nucleus During Evolution -- 1. INTRODUCTION -- 2. GENE CONTENT OF LAND PLANT MITOCHONDRIA -- 3. GENE TRANSLOCATION AND INTEGRATION -- 4. PROMOTER ACQUISITION -- 5. TARGETING SIGNAL ACQUISITION -- 6. GENE SUBSTITUTION -- 7. PERSPECTIVES ON GENE TRANSFER ANALYSIS -- REFERENCES -- Chapter Three - The Role of Horizontal Transfer in Shaping the Plant Mitochondrial Genome -- 1. INTRODUCTION -- 2. ENDOSYMBIOTIC GENE TRANSFER -- 3. INTERSPECIFIC TRANSFER -- 4. INTRACELLULAR TRANSFER -- 5. INTERSPECIFIC AND INTER COMPARTMENTAL TRANSFER -- 6. MECHANISMS OF TRANSFER -- 7. EVOLUTIONARY SIGNIFICANCE -- 8. FUTURE PROSPECTS -- ACKNOWLEDGEMENTS -- REFERENCES -- Chapter Four - Mitochondrial Genome Evolution and Gynodioecy -- 1. EVOLUTIONARY DYNAMICS OF GYNODIOECY -- 2. GENOME EVOLUTION AND GYNODIOECY -- REFERENCES -- Chapter Five - Cytonuclear Adaptation in Plants -- 1. INTRODUCTION -- 2. CYTONUCLEAR COADAPTATION -- 3. THE INVOLVEMENT OF ORGANELLES IN PLANT ADAPTATION TO THEIR ENVIRONMENT -- 4. CONCLUSION AND PERSPECTIVES FOR FURTHER RESEARCH. , ACKNOWLEDGEMENTS -- REFERENCES -- Chapter Six - Mitochondrial Genomes of Photosynthetic Euglenids and Alveolates -- 1. MITOCHONDRIAL GENOMES OF EUGLENIDS -- 2. MITOCHONDRIAL GENOMES OF PHOTOSYNTHETIC ALVEOLATES -- ACKNOWLEDGEMENTS -- REFERENCES -- Chapter Seven - Evolution of Mitochondrial Introns in Plants and Photosynthetic Microbes -- 1. INTRODUCTION -- 2. CATEGORIES OF MITOCHONDRIAL INTRONS IN PLANTS AND ALGAE -- 3. DISTRIBUTION OF MITOCHONDRIAL INTRONS IN PLANTS AND PHOTOSYNTHETIC MICROBES -- 4. LIFE CYCLE OF GROUP I/II INTRON MOBILE GENETIC ELEMENTS -- 5. PROTEIN MACHINERY FOR GROUP I/II INTRON SPLICING IN PLANTS AND ALGAE -- 6. RELATIONSHIP BETWEEN SPLICING AND OTHER EVENTS IN THE MITOCHONDRION -- 7. FUTURE PERSPECTIVES -- ACKNOWLEDGEMENTS -- REFERENCES -- Chapter Eight - Green Algae Genomics: A Mitochondrial Perspective -- 1. INTRODUCTION -- 2. CHLOROPHYTE GENOMES OVERVIEW -- 3. MITOCHONDRIAL GENOME EVOLUTION -- 4. COMPARATIVE GENOMICS AND ACQUISITION OF NEW METABOLIC CAPABILITIES -- 5. PERSPECTIVES -- ACKNOWLEDGEMENTS -- REFERENCES -- Chapter Nine - Recombination in the Stability, Repair and Evolution of the Mitochondrial Genome -- 1. INTRODUCTION -- 2. STRUCTURE AND VARIATION OF PLANT MITOCHONDRIAL GENOMES -- 3. RECOMBINATION IN MTDNA MAINTENANCE -- 4. GENES INVOLVED IN MTDNA REPLICATION, REPAIR AND RECOMBINATION -- 5. CONCLUSIONS AND FUTURE PERSPECTIVES -- REFERENCES -- Chapter Ten - Mitochondrial Genome Evolution and the Emergence of PPR Proteins -- 1. INTRODUCTION -- 2. SPECIFIC GENE EXPRESSION PROCESSES IN PLANT MITOCHONDRIA -- 3. EVOLUTION OF MITOCHONDRIAL GENE EXPRESSION PROCESSES AND CORRELATIONS WITH MITOCHONDRIAL GENOMES STRUCTURE -- 4. DIVERSITY AND EVOLUTION OF PPR PROTEINS -- 5. CORRELATIONS BETWEEN THE EMERGENCE OF PPR PROTEINS AND SPECIFIC GENE EXPRESSION PROCESSES -- ACKNOWLEDGEMENTS -- REFERENCES. , Chapter Eleven - Evolution of Protein Import Pathways -- 1. EVOLUTION OF MITOCHONDRIA: FROM BACTERIUM TO ENDOSYMBIONT -- 2. TARGETING SIGNALS -- 3. TRANSLOCASE OF THE OUTER MEMBRANE AND SORTING AND ASSEMBLY MACHINERY -- 4. THE INTERMEMBRANE SPACE -- 5. THE INNER MEMBRANE -- 6. MITOCHONDRIAL PRECURSOR PROCESSING AND PRESEQUENCE DEGRADATION -- 7. CONCLUSIONS -- REFERENCES -- Chapter Twelve - Macromolecules Trafficking to Plant Mitochondria -- 1. INTRODUCTION -- 2. PROTEIN IMPORT INTO MITOCHONDRIA -- 3. TARGETING SIGNALS -- 4. DUAL TARGETING OF PROTEINS -- 5. CYTOSOLIC MRNA TARGETING TO THE VICINITY OF MITOCHONDRIA -- 6. TRANSFER RNA IMPORT -- 7. DNA UPTAKE INTO MITOCHONDRIA -- REFERENCES -- INDEX -- Color Plates.
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  • 2
    ISSN: 1432-0983
    Keywords: Key words Chloroplast-like tRNA gene ; nad2 ; Plant mitochondrial promoter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two copies of the chloroplast-like tRNAAsn gene, trnN1 and trnN2, are expressed in potato mitochondria. While Northern-blot analysis revealed only mature tRNAAsn, RT-PCR indicated that trnN1 is co-transcribed with trnY and nad2 (exons c, d and e). Using primer-extension and capping experiments, four transcription initiation sites have been mapped in the vicinity of these genes. The first site, responsible for the co-transcription of trnN1, trnY and nad2 (exons c, d and e), gives rise to a primary transcript of at least 7000 nt. A second site, 58 nt downstream from trnY, corresponds to an alternative promoter specific for nad2. In both cases, only the CRTA core motif of the consensus CRTAaGaGA of dicot mitochondrial promoters was found. Finally, two transcription initiation sites were identified 135 and 128 nt upstream of trnN2 in a region which shows no sequence homology with this consensus motif.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-5028
    Keywords: aminoacylation ; identity element ; plant ; suppression ; transfer RNA ; transient expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Alanine and phenylalanine tRNA sequences were amplified by PCR from Arabidopsis thaliana nuclear DNA using degenerate oligonucleotides which introduced specific mutations into the acceptor stem. The aminoacylation of T7 RNA polymerase transcripts of these sequences was investigated in vitro using partially purified bean alanyl- or phenylalanyl-tRNA synthetase. In parallel, the in vivo activity of amber suppressor derivatives of these tRNAs was investigated in transient expression assays in tobacco protoplasts using a β-glucuronidase (GUS) reporter gene containing a premature amber stop codon. The results show that mutation of the G3:U70 base pair to G3:C70 blocks aminoacylation of plant alanine tRNA, whilst conversion of the G3:C70 pair normally found in plant tRNAPhe to G3:U70 enables the mutated tRNAPhe to be a good substrate for analyl-tRNA synthetase and impairs its aminoacylation with phenylalanine. In addition, the amber suppressor derivative of wild-type tRNAPhe showed very little suppressor activity in vivo, and was poorly aminoacylated with phenylalanine in vitro, suggesting that the anticodon is a major identity determinant for tRNAPhe in plant cells.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 252 (1996), S. 404-411 
    ISSN: 1617-4623
    Keywords: Key words Mitochondria ; tRNA ; Import ; Maize ; Potato ; Larch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A systematic comparison of the tRNAs imported into the mitochondria of larch, maize and potato reveals considerable differences among the three species. Larch mitochondria import at least eleven different tRNAs (more than half of those tested) corresponding to ten different amino acids. For five of these tRNAs [tRNAPhe(GAA), tRNALys(CUU), tRNAPro(UGG), tRNASer(GCU) and tRNASer(UGA)] this is the first report of import into mitochondria in any plant species. There are also differences in import between relatively closely related plants; wheat mitochondria, unlike maize mitochondria import tRNAHis, and sunflower mitochondria, unlike mitochondria from other angiosperms tested, import tRNASer(GCU) and tRNASer(UGA). These results suggest that the ability to import each tRNA has been acquired independently at different times during the evolution of higher plants, and that there are few apparent restrictions on which tRNAs can or cannot be imported. The implications for the mechanisms of mitochondrial tRNA import in plants are discussed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-5028
    Keywords: identity determinants ; mitochondria ; nuclear genome ; plant ; tRNA genes ; tRNA import
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Bean nuclear genes for tRNAPro, tRNAThrand tRNALeu were isolated. Expression of the tRNAPro genes was demonstrated in vivo and sequence analysis suggested amplification of the tRNAPro gene copy number through duplication of a gene cluster at the same locus of the bean genome. The two tRNAThr genes isolated were actively transcribed and their transcripts processed in a HeLa cell system. In vivo expression tests of these genes and aminoacylation assays of the corresponding in vitro transcripts showed the presence of identity determinants in the anticodon of plant tRNAThr. The tRNALeu gene was not expressed due to deviation from the consensus in the internal B-box promoter. The same sequence deviation also prevented aminoacylation of the corresponding in vitro transcript. This tRNALeu however exists in plants and is synthesized from another gene with a consensus B-box promoter. Plant mitochondria import from the cytosol a number of nucleus-encoded tRNAs, including tRNALeu and tRNAThr. From the available sequence data, we could not identify any conserved structural motif characteristic for the nucleus-encoded tRNAs imported into plant mitochondria, either in the tRNAs, or in the gene flanking sequences. These results suggest that recognition of tRNAs for import is idiosyncratic and likely to depend on protein/RNA interactions that are specific to each tRNA or each isoacceptor group.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2019-07-16
    Description: Prasinoviruses are among the largest viruses (〉200 kbp) and encode several hundreds of protein coding genes, including most genes of the DNA replication machinery and several genes involved in transcription and translation, as well as tRNAs. They can infect and lyse small eukaryotic planktonic marine green algae, thereby affecting global algal population dynamics. Here we investigate the causes of codon usage bias in one prasinovirus, OtV5, and its host Ostreococcus tauri, during a viral infection using microarray expression data. We show that (i) codon usage bias in the host and in the viral genes increases with expression levels and (ii) optimal codons use those tRNAs encoded by the most abundant host tRNA genes, supporting the notion of translational optimization by natural selection. We find evidence that viral tRNA genes complement the host tRNA pool for those viral amino acids whose host tRNAs are in short supply. We further discuss the coevolution of Codon usage bias in hosts and prasinoviruses by comparing optimal codons in 3 evolutionary Diverged host--‐virus specific pairs whose complete genome sequences are known.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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