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  • Red algae  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    The psbA-gene from a red alga resembles those from Cyanobacteria and Cyanelles (1990)
    Springer
    Current genetics 17 (1990), S. 255-259 
    Details
    ISSN: 1432-0983
    Keywords: Red algae ; psbA gene ; Plastid evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Plastid DNA (ptDNA) from the unicellular red alga Cyanidium caldarium was isolated. A 5.8 kb Eco RI, fragment containing the entire psbA-gene was cloned and the nucleotide sequence of the psbA-gene determined. At the carboxyl terminus the encoded protein (D1) contains the seven amino acid-insertion which was found to be typical of the cyanobacteria and the cyanelles of Cyanophora paradoxa. However, the overall sequence homology does not support a direct relationship between the plastids of Cyanidium, cyanelles and the cyanobacteria. As in other photosynthetic organisms the psbA-gene is transcribed as a monocistronic mRNA. The ribosomal RNA operon was located 4 kb upstream of the psbA-gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00312617
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  • 2
    Electronic Resource
    Electronic Resource
    The genes of both subunits of ribulose-1,5-bisphosphate carboxylase constitute an operon on the plastome of a red alga (1989)
    Springer
    Current genetics 16 (1989), S. 203-209 
    Details
    ISSN: 1432-0983
    Keywords: Red algae ; ptDNA ; Ribulose-1,5-bisphosphate carboxylase ; Plastid evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Plastid (pt) DNA from the red alga Porphyridium aerugineum was purified by CsCI gradient centrifugation. An EcoRI library of the ptDNA was screened with a gene probe specific for the gene encoding the large subunit (LSU) of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco EC 4.1.1.39) from spinach. A 5.8 kb EcoRI clone containing the LSU gene (rbcL) was isolated and the DNA sequence of the Porphyridium rbcL gene and its flanking regions was determined. An open reading frame was found 130 by downstream from the rbcL gene that shows homology to genes coding for the small subunit of Rubisco (rbcS) from higher plants and cyanobacteria. Both genes (rbcL + rbcS) are cotranscribed. Comparison of rbcL and rbcS sequences from Porphyridium, higher plants and cyanobacteria seems to reveal a remarkable evolutionary distance between the plastids of the red algae (rhodoplasts), chloroplasts and cyanobacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391478
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  • 3
    Electronic Resource
    Electronic Resource
    Structure of the rubisco operon from the multicellular red alga Antithamnion spec. (1990)
    Springer
    Current genetics 18 (1990), S. 465-469 
    Details
    ISSN: 1432-0983
    Keywords: Red algae ; Plastid evolution ; Ribulose-1,5-bisphosphate carboxylase/oxygenase ; Plastid DNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In the multicellular red alga Antithamnion spec. both rubisco genes (rbcL and rbcS) are encoded on the plastid DNA (ptDNA). Both genes are separated by a short A/T-rich spacer of 100 bp and are cotranscribed into an mRNA of approximately 2.7 kb. These findings are in extensive agreement with those obtained from two unicellular red algae (Porphyridium aerugineum and Cyanidium caldarium). The large subunit (LSU) of rubisco shows an amino acid homology of 82–87% with the LSUs from the two unicellular red algae and only about 55% to LSUs from green algae, higher plants and two cyanobacteria. The small subunit (SSU) of rubisco is more similar to those from the unicellular red algae and two algae which are members of the Chromophyta (about 60% homology) than to cyanobacterial and higher plant proteins (27–36% homology). These data indicate that rhodoplasts originated independently from the chloroplast line. The plastids of chromophytes and rhodophytes appear to be closely related.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309918
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