Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A circular 73 kb DNA from the colourless flagellate Astasia longa that resembles the chloroplast DNA of Euglena: restriction and gene map (1989)
    Springer
    Current genetics 15 (1989), S. 435-441 
    Details
    ISSN: 1432-0983
    Keywords: Astasia longa ; Plastid DNA ; Restriction map ; Gene map
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A 73 kbp circular DNA was isolated from the colourless euglenoid flagellate Astasia longa. Restriction sites of 12 restriction endonucleases were mapped on this DNA. Southern hybridization using plastid gene probes from Euglena, spinach and tobacco revealed sequence homologies to the genes coding for 16S and 23S ribosomal RNAs, elongation factor Tu (tufA) and the large subunit of ribulose-1,5-bisphosphate carboxylase (rbcL). The locations of these sequences on the restriction map were determined. Sequences homologous to chloroplast genes psaA, psbA, psbD, psbE and atpA are not present. The ribosomal RNA genes are organized in three tandem repeats, each containing one 23S and one 16S rRNA gene. In addition, there is one extra 16S rRNA gene. These results indicate the presence of a truncated form of a plastid DNA in Astasia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376801
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Genes for components of the chloroplast translational apparatus are conserved in the reduced 73-kb plastid DNA of the nonphotosynthetic euglenoid flagellate Astasia longa (1994)
    Springer
    Current genetics 26 (1994), S. 256-262 
    Details
    ISSN: 1432-0983
    Keywords: Astasia longa ; Plastid DNA ; Ribosomal protein genes ; tRNA genes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The colourless, nonphotosynthetic protist Astasia longa is phylogenetically related to Euglena gracilis. The 73-kb plastid DNA (ptDNA) of A. longa is about half the size of most chloroplast DNAs (cpDNAs). More than 38 kb of the Astasia ptDNA sequence has been determined. No genes for photosynthetic function have been found except for rbcL. Identified genes include rpoB, tufA, and genes coding for three rRNAs, 17 tRNAs, and 13 ribosomal proteins. Not only is the nucleotide sequence of these genes highly conserved between A. longa and E. gracilis, but a number of these genes are clustered in a similar fashion and have introns in the same positions in both species. The results further support the idea that photosynthetic genes normally encoded in cpDNA have been preferentially lost in Astasia, but that the chloroplast genes coding for components of the plastid translational apparatus have been maintained. This apparatus might be needed for the expression of rbcL and also for that of still unidentified nonphotosynthetic genes of Astasia ptDNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309557
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...