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  • Astasia longa  (3)
  • Springer  (3)
  • American Institute of Physics
  • De Gruyter
  • 2005-2009
  • 1995-1999
  • 1990-1994  (3)
Collection
Keywords
Publisher
  • Springer  (3)
  • American Institute of Physics
  • De Gruyter
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Genes for ribosomal proteins are retained on the 73 kb DNA from Astasia longa that resembles Euglena chloroplast DNA (1990)
    Springer
    Current genetics 18 (1990), S. 457-464 
    Details
    ISSN: 1432-0983
    Keywords: Astasia longa ; Euglena ; Plastid DNA ; Ribosomal protein genes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The nucleotide sequence of a 6.7 kb segment of the circular 73 kb DNA from Astasia longa has been determined. We identified genes for a tRNA-Ile (CAU), a tRNA-Phe (GAA), a tRNA-Cys (GCA) and the ribosomal proteins CS8, CL36, CS14 and CS2, that are normally encoded by plastid genomes. In addition, a gene for the chloroplast ribosomal protein CL5 was found that is not encoded by the plastome in either higher plants or a liverwort, but has recently been identified in Euglena chloroplast DNA. Transcripts of these protein genes, and of an unidentified open reading frame (ORF50), were detected. These results support our previous suggestion that the 73 kb DNA from Astasia is a truncated form of plastid DNA. The 73 kb DNA resembles the chloroplast DNA of Euglena gracilis but contains, almost exclusively, genes for a plastid-type translational (and presumably transcriptional) apparatus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309917
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  • 2
    Electronic Resource
    Electronic Resource
    Structure and expression of a gene encoding the large subunit of ribulose-1,5-bisphosphate carboxylase (rbcL) in the colourless euglenoid flagellate Astasia longa (1990)
    Springer
    Plant molecular biology 14 (1990), S. 825-833 
    Details
    ISSN: 1573-5028
    Keywords: Astasia longa ; chloroplast DNA ; introns ; ribulose-1,5-bisphosphate carboxylase ; rbcL gene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A gene encoding the large subunit of ribulose-1,5-bisphosphate carboxylase (Rubisco) was identified on a circular 73 kb DNA from the colourless euglenoid flagellate Astasia longa. The rbcL gene of Astasia extends over 3968 bp. It is a split gene interrupted by seven introns as compared to nine intervening sequences in the rbcL gene of the phylogenetically related Euglena gracilis. Coding sequences as well as the positions of the introns within this gene are highly conserved in comparison with the Euglena rbcL except that two introns are missing in Astasia. The alignment of the amino acid sequences deduced from the nucleotide sequences of rbcL of Astasia and Euglena shows 82% identical amino acids whereas 15% of the amino acids represent conservative changes. A 1.5 kb transcript of the rbcL gene was revealed by northern blot analysis of Astasia RNA. By immunoblot analysis the gene product of rbcL was detected as a 53 kDa polypeptide. Genes for components of the chloroplast transcriptional and translational systems encoded by chloroplast DNA of plants and green algae are conserved on the 73 kb DNA of Astasia [24, 25, 26]. From our finding that Astasia obviously is capable of synthesizing the Rubisco large subunit one must conclude that these genes are expressed and form functional plastid transcriptional and translational systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00016515
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  • 3
    Electronic Resource
    Electronic Resource
    Genes for the plastid elongation factor Tu and ribosomal protein S7 and six tRNA genes on the 73 kb DNA from Astasia longa that resembles the chloroplast DNA of Euglena (1990)
    Springer
    Molecular genetics and genomics 220 (1990), S. 425-432 
    Details
    ISSN: 1617-4623
    Keywords: Astasia longa ; Plastid DNA ; rps7, tuf and tRNA genes ; ORFs ; Transcription
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The nucleotide sequence of a 6156 by segment of the circular 73 kb DNA from Astasia longa resembling the chloroplast DNA of Euglena was determined. The genes for the plastid elongation factor Tu (tufA) and the ribosomal protein S7 (rps7), six tRNA genes (trnQ, trnS, trnG, trnM, trnT, trnR), and three open reading frames were identified. These genes show a high degree of sequence similarity (73%–99%) to the corresponding genes on the Euglena chloroplast genome. The tufA gene contains two small AT-rich introns within its coding region. Northern analysis revealed the in vivo transcription of the tufA gene and of a reading frame of 456 codons into monocistronic mRNAs of 1.3 and 1.4 kb, respectively. The arrangement and organization of the genes on the 73 kb DNA of the colourless heterotrophic flagellate Astasia and the chloroplast DNA of autotrophic Euglena are compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391749
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