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  • 1
    Digitale Medien
    Digitale Medien
    Cloning and expression analysis of the plastidic fructose-1,6-bisphosphatase coding sequence from potato: circumstantial evidence for the import of hexoses into chloroplasts (1992)
    Springer
    Planta 188 (1992), S. 7-12 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Calvin cycle ; Chloroplast ; Fructose-1,6-bisphosphatase ; Solanum (chloroplast) ; Sucrose induction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A copy DNA encoding the plastid-located isoform of the fructose-1,6-bisphosphatase (cp-FBPase) has been cloned from potato (Solanum tuberosum L.). Sequence analysis reveals a high degree of homology to cp-FBPases from wheat, spinach, and Arabidopsis. Analysis of RNA blots shows that the expression of the cp-FBPase is limited to green tissue such as leaf and stem, and is absent from photosynthetically inactive tissue such as roots, tubers and stolons. This provides additional evidence that hexoses or hexose phosphates are imported into amyloplasts of heterotrophic tissues. Incubation of detached leaves of potato in darkness in a sucrosecontaining medium leads to massive accumulation of both starch and transcripts encoding starch biosynthetic enzymes. However, no transcripts encoding the cp-FBPase are detectable under these conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00198933
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  • 2
    Digitale Medien
    Digitale Medien
    Cloning and expression analysis of the plastidic fructose-1,6-bisphosphatase coding sequence from potato: circumstantial evidence for the import of hexoses into chloroplasts (1992)
    Springer
    Planta 188 (1992), S. 7-12 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Calvin cycle ; Chloroplast ; Fructose-1,6-bisphosphatase ; Solanum (chloroplast) ; Sucrose induction
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A copy DNA encoding the plastid-located isoform of the fructose-1,6-bisphosphatase (cp-FBPase) has been cloned from potato (Solanum tuberosum L.). Sequence analysis reveals a high degree of homology to cp-FBPases from wheat, spinach, andArabidopsis. Analysis of RNA blots shows that the expression of the cp-FBPase is limited to green tissue such as leaf and stem, and is absent from photosynthetically inactive tissue such as roots, tubers and stolons. This provides additional evidence that hexoses or hexose phosphates are imported into amyloplasts of heterotrophic tissues. Incubation of detached leaves of potato in darkness in a sucrosecontaining medium leads to massive accumulation of both starch and transcripts encoding starch biosynthetic enzymes. However, no transcripts encoding the cp-FBPase are detectable under these conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01160706
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  • 3
    Digitale Medien
    Digitale Medien
    The coding sequence for sedoheptulose-1,7-bisphosphatase detects multiple homologues in wheat genomic DNA (1992)
    Springer
    Theoretical and applied genetics 85 (1992), S. 133-135 
    Details
    ISSN: 1432-2242
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00222849
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  • 4
    Digitale Medien
    Digitale Medien
    Common features of three inversions in wheat chloroplast DNA (1988)
    Springer
    Current genetics 13 (1988), S. 343-349 
    Details
    ISSN: 1432-0983
    Schlagwort(e): Chloroplast DNA ; tRNA genes ; Gene duplication ; Inversion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary We have determined the DNA sequences of regions involved in two of the three inversions known to have occurred during the evolution of wheat chloroplast DNA. This establishes the extent of the second largest of the three inversions. Examination of these sequences suggests that although short repeated sequences are present, the endpoints of the second and third inversions are not associated with repeated sequences as long as those associated with the first inversion. However the endpoints of all three inversions are all adjacent to at least one tRNA gene, and there is evidence that three of the tRNA genes have been subjected to partial duplication, possibly at the time of inversion. This suggests that tRNA genes might be involved with rearrangements of chloroplast DNA, as has also been postulated for mitochondrial DNA.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00424430
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  • 5
    Digitale Medien
    Digitale Medien
    In wheat ctDNA, segments of ribosomal protein genes are dispersed repeats, probably conserved by nonreciprocal recombination (1988)
    Springer
    Current genetics 14 (1988), S. 127-136 
    Details
    ISSN: 1432-0983
    Schlagwort(e): Wheat chloroplast DNA ; Repeated sequences ; Ribosomal protein genes ; Evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Some dispersed repeated sequences and their flanking regions from wheat and maize ctDNAs have been characterized. Two sets of wheat ctDNA repeats were found to be the chloroplast ribosomal protein genesrpl2 andrpl23, plus nonfunctional segments of them, designatedrpl2′ andrpl23′. Pairwise comparisons were made between the wheatrp123 andrpl23′, and the maizerp123′ sequences. The precise patterns of homology suggest that the divergence of the wheat and maize nonfunctional (rpl23′) sequences is being retarded by nonreciprocal recombination, biased by selection for individuals with functional (rpl23) sequences. The implied involvement of these sequences in mechanisms of homologous recombination, and therefore in the creation and spread of new ctDNA variants, is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00569336
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  • 6
    Digitale Medien
    Digitale Medien
    The location and possible evolutionary significance of small dispersed repeats in wheat ctDNA (1986)
    Springer
    Current genetics 10 (1986), S. 931-941 
    Details
    ISSN: 1432-0983
    Schlagwort(e): T. aestivum ; Chloroplast DNA ; Repeat DNA ; Evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Low-stringency hybridisation between recombinant plasmids representing the complete T. aestivum chloroplast genome has revealed small repeated DNA segments dispersed through the molecule. Thirty-two repeated DNA segments were detected, and they could be divided into 12 unrelated sets; no repeat was detected as multiple copies. The longest of the small repeats mapped just within the large inverted repeat in spinach and mung-bean ctDNAs. It was found to have been duplicated after the divergence of a cereal progenitor to generate a third, dispensible copy, 0.2 kbp downstream of rbcL. In maize at least, this copy has also become integrated, with rbcL, in the mitochondrial genome. Another of the repeats is thought to have mediated a chloroplast DNA inversion (Howe 1985). Thus the diverse collection of small repeats probably represents some consequences and causes of past recombination events as well as a mechanism for further intramolecular ctDNA recombination. Their possible significance in the restructuring and evolution of chloroplast genomes is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00398291
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  • 7
    Digitale Medien
    Digitale Medien
    Localisation of genes for components of photosystem II in chloroplast DNA from pea and wheat (1985)
    Springer
    Current genetics 10 (1985), S. 329-333 
    Details
    ISSN: 1432-0983
    Schlagwort(e): Pea ; Wheat ; Chloroplast genes ; Photosystem II
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The genes for three components of photosystem II have been localised in chloroplast DNA from pea and wheat by hybridisation with gene-internal sequences from spinach chloroplast DNA. In both pea and wheat, the gene for the 51 kDa polypeptide is located close to the genes for cytochrome b-563 and the 15 kDa polypeptide of the cytochrome b-f complex. The genes for the D2 and 44 kDa polypeptides are located close together, approximately 55 kbp from the gene for the 51 kDa polypeptide, in both pea and wheat chloroplast DNA. The location and orientation of the genes for the D2 and 44 kDa polypeptides in wheat chloroplast DNA indicate that the rearrangement of the wheat genome with respect to the spinach genome is the result of at least two inversions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00365629
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  • 8
    Digitale Medien
    Digitale Medien
    Differential expression of the psbB and psbH genes encoding the 47 kDa chlorophyll a-protein and the 10 kDa phosphoprotein of photosystem II during chloroplast development in wheat (1991)
    Springer
    Current genetics 19 (1991), S. 199-206 
    Details
    ISSN: 1432-0983
    Schlagwort(e): Light regulation ; psbN ; Triticum aestivum ; Etioplast
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The nucleotide sequence of a region of wheat chloroplast DNA containing the psbB gene for the 47 kDa chlorophyll a-binding protein of photosystem II has been determined. The gene encodes a polypeptide of 508 amino acid residues which is predicted to contain six hydrophobic membrane-spanning regions. The psbB gene is located 562 bp upstream of the psbH gene for the 10 kDa phosphoprotein of photosystem II. A small open reading frame of 38 codons is located between psbB and psbH, and on the opposite strand the psbN gene, encoding a photosystem II polypeptide of 43 amino acid residues, is located between orf38 and psbH. S1 nuclease mapping indicated that the 5′ ends of transcripts were located 371 and 183 bp upstream of the psbB translation initiation codon. Predominant transcripts of 2.1 kb and 1.8 kb for psbB and 0.4 kb for psbH were present in RNA isolated from etiolated and greening wheat seedlings. Immunodecoration of Western blots indicated that the 47 kDa polypeptide was absent, or present in very low amounts, in dark-grown tissue and accumulated on greening, whereas the 10 kDa polypeptide was present in similar amounts in both dark-grown and greening seedlings. The 10 kDa polypeptide was phosphorylated in vitro by incubating wheat etioplast membranes with [γ3 2P] ATP.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00336487
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  • 9
    Digitale Medien
    Digitale Medien
    Use of the polymerase chain reaction to detect spacer size heterogeneity in plant 5S-rRNA gene clusters and to locate such clusters in wheat (Triticum aestivum L.) (1992)
    Springer
    Theoretical and applied genetics 83 (1992), S. 684-690 
    Details
    ISSN: 1432-2242
    Schlagwort(e): PCR ; 5S-ribosomal RNA ; Non-transcribed spacer ; Triticum aestivum ; Chromosome location
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary We have used the polymerase chain reaction to analyse variation in the size of individual 5S-ribosomal gene spacer sequences. This reaction can be used to demonstrate inter- and intraspecific variation in spacer size, and combined with DNA sequencing it may thus be a valuable taxonomic tool. Two sets of nested polymerase chain reaction primers were designed to amplify the nontranscribed spacer DNA between repeated 5S-rRNA genes. These “universal” primers were used to generate fragments from the genomic DNA from several unrelated monocotyledonous plants. Ribosomal RNA spacer sequences generated in these experiments could also be used to locate 5S-rRNA gene clusters on specific chromosomes in hexaploid wheat (Triticum aestivum). Three distinct spacer sizes were observed after amplification. These were assigned locations on chromosomes by analysing amplification products of genomic DNA from nullisomic/tetrasomic and ditelosomic wheat stocks. “Large” 508-bp 5S repeats are located on the short arm of chromosome 5B and “short” 416-bp and 425-bp repeat unit variants are located on the short arms of chromosomes 1B and 1D, respectively. No other loci were detected. The spacer fragments were cloned, sequenced, and shown to be homologous to wheat 5S-rRNA spacers previously identified. Spacers of uniform size but with some sequence heterogeneity were shown to be located at each locus.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00226685
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  • 10
    Digitale Medien
    Digitale Medien
    Location of the redox-active cysteines in chloroplast sedoheptulose-1,7-bisphosphatase indicates that its allosteric regulation is similar but not identical to that of fructose-1,6-bisphosphatase (1998)
    Springer
    Photosynthesis research 58 (1998), S. 221-230 
    Details
    ISSN: 1573-5079
    Schlagwort(e): 3-D modelling ; redox-active cysteines ; site-directed mutagenesis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Sedoheptulose-1,7-bisphosphatase (SBPase) is a Calvin Cycle enzyme exclusive to chloroplasts and is involved in photosynthetic carbon fixation. The two cysteine residues involved in its redox regulation have been identified by site-directed mutagenesis. They are four residues apart in a predicted loop between two alpha helices and probably form a disulphide bond when oxidised. Three-dimensional modelling of SBPase has been performed using crystallographic data from the structurally homologous pig fructose-1,6-bisphosphatase (FBPase). The results suggest that formation of the disulphide bridge in SBPase is directly analogous to the allosteric regulation of pig FBPase by AMP in terms of the resulting structural changes. Similar changes are thought to occur in chloroplast FBPase, which like SBPase, is also redox regulated and involved in carbon fixation. From the results presented here it appears that the same basic mechanism for the allosteric regulation of enzymic activity operates in the FBPases and SBPase but that the sites at which the regulatory ligands (AMP or thioredoxin) exert their effects are different in each
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006178826976
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