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  • 1
    Electronic Resource
    Electronic Resource
    Two amino-acid biosynthetic genes are encoded on the plastid genome of the red alga Porphyra umbilicalis (1993)
    Springer
    Current genetics 23 (1993), S. 59-65 
    Details
    ISSN: 1432-0983
    Keywords: Acetolactate synthase ; N-acetylglutamate kinase ; tRNA genes ; Chloroplast genome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary To isolate the gene encoding the amino-acid biosynthetic enzyme acetolactate synthase (ALS) from the red alga Porphyra umbilicalis, PCR experiments were carried out using P. umbilicalis DNA as the template and degenerate oligonucleotides representing conserved regions of ALS amino-acid sequences. Interestingly, the PCR product (0.9 kb) hybridized exclusively to the plastid DNA of this red alga. DNA sequencing of two contiguous EcoRI plastid DNA clones revealed a 590 aminoacid open reading frame with 55 to 61% identity to cyanobacterial ALS sequences. A second gene (argB) encoding another amino-acid biosynthetic enzyme, Nacetylglutamate kinase, was identified upstream of, and on the opposite strand to the gene encoding ALS (ilvB). This is the first molecular characterization of a gene for an arginine biosynthetic enzyme from any plant. In addition, two tRNA genes, trnT(GGU) and trnY(GUA), were detected downstream from ilvB while four tRNA genes, trnfM(CAU), trnA(GGC), trnA(GGC), trnS(GCU) and trnD(GUC), were found downstream from argB. trnA(GGC) is not found in the chloroplast genomes of land plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336751
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The ribosomal RNA repeats are non-identical and directly oriented in the chloroplast genome of the red alga Porphyra purpurea (1993)
    Springer
    Current genetics 24 (1993), S. 443-450 
    Details
    ISSN: 1432-0983
    Keywords: Chloroplast genome ; Direct repeats ; Restriction map ; Rhodophyte
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A detailed restriction map of the chloroplast genome of the red alga Porphyra purpurea has been constructed. Southern hybridization experiments with cloned or gel-purified restriction fragments and PCR products indicate that the P. purpurea chloroplast genome is approximately 188 kb in size. This circular molecule contains two rRNA-encoding repeats (approximately 4.9 kb) that separate the genome into single-copy regions of 34 kb and 144 kb. Interestingly, these repeats are arranged in a direct orientation. In addition, DNA sequencing of the ends of both repeats revealed that the two rRNA repeats are not identical. No intramolecular recombination between the repeats can be detected. We discuss the possibility that the chloroplast genome of P. purpurea is organized like that of the ancestral chloroplast.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351855
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A β-ketoacyl-acyl carrier protein synthase III gene (fabH) is encoded on the chloroplast genome of the red alga Porphyra umbilicalis (1993)
    Springer
    Plant molecular biology 21 (1993), S. 185-189 
    Details
    ISSN: 1573-5028
    Keywords: chloroplast genome ; fabH ; Porphyra umbilicalis ; trnL(GAG)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract DNA sequencing of a region of the chloroplast genome of the red alga Porphyra umbilicalis revealed an open reading frame of 326 amino acids. Databank searches indicated that this ORF is 34% identical to an E. coli gene (fabH) encoding β-ketoacyl-carrier protein synthase III. In addition, a leucine tRNA gene (trnL(GAG)) was detected just downstream. Neither of these genes are encoded on the chloroplast genomes of land plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00039630
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  • 4
    Electronic Resource
    Electronic Resource
    psaE andtrnS(CGA) are encoded on the plastid genome of the red algaPorphyra umbilicalis (1992)
    Springer
    Plant molecular biology 18 (1992), S. 773-775 
    Details
    ISSN: 1573-5028
    Keywords: plastid genome ; Porphyra umbilicalis ; psaE, trnS(CGA)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00020018
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Localization of β-phycoerythrin to the thylakoid lumen of Cryptomonas Φ does not involve a signal peptide (1990)
    Springer
    Plant molecular biology 15 (1990), S. 585-592 
    Details
    ISSN: 1573-5028
    Keywords: algae ; phycobiliprotein ; plastid ; protein targeting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Recent investigations [21, 37] have shown that, in cryptomonads, the phycobiliproteins are located within the thylakoid lumen rather than on the stromal side of this membrane as found in cyanobacteria and red algae. To examine possible mechanisms involved in targeting this protein to the thylakoid lumen, the plastid-encoded cpeB gene from Cryptomonas Φ was sequenced. This gene encodes an open reading frame of 177 amino acids that is highly similar to known β-phycoerythrin proteins. cpeB is expressed as a monocistronic transcript of approximately 680 bases. The genes for the alpha subunits of phycoerythrin are not co-transcribed with cpeB nor located anywhere near it. No evidence of amino-or carboxy-terminal extensions or interior modifications involved in directing the Cryptomonas β-phycoerythrin into the lumen of the thylakoid could be detected. These data suggest that a novel mechanism may be involved in directing cryptomonad biliproteins to the thylakoid lumen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00017833
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    Paper (German National Licenses)
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