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  • 1
    Electronic Resource
    Electronic Resource
    Molecular Data from the Chloroplast rpoC1 Gene Suggest a Deep and Distinct Dichotomy of Contemporary Spermatophytes into Two Monophyla: Gymnosperms (Including Gnetales) and Angiosperms (1999)
    Springer
    Journal of molecular evolution 49 (1999), S. 310-315 
    Details
    ISSN: 1432-1432
    Keywords: Key words:Gnetum— Chloroplast DNA — RNA polymerase — Molecular phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Partial sequences of the rpoC1 gene from two species of angiosperms and three species of gymnosperms (8330 base pairs) were determined and compared. The data obtained support the hypothesis that angiosperms and gymnosperms are monophyletic and none of the recent groups of the latter is sister to angiosperms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00006553
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  • 2
    Electronic Resource
    Electronic Resource
    cDNA cloning of a Sec61 homologue from the cryptomonad alga Pyrenomonas salina (1994)
    Springer
    Current genetics 26 (1994), S. 410-414 
    Details
    ISSN: 1432-0983
    Keywords: Cryptomonads ; Sec61 ; ER proteins ; Trans-port mechanisms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sec61 is an endoplasmic reticulum transmembrane protein involved in the process of translocation of proteins across this membrane. To-date, the only cloned genes for Sec61 are derived from mammals and yeast. In this paper, we present the first full-length cDNA from a sec61 gene of a plant cell. Comparison of the predicted protein sequence with all known Sec61 proteins, as well as with the bacterial/plastome-encoded homologue Sec Y, demonstrates a high degree of similarity among the Sec Y/Sec61 family.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309927
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  • 3
    Electronic Resource
    Electronic Resource
    Multiple recruitment of class-I aldolase to chloroplasts and eubacterial origin of eukaryotic class-II aldolases revealed by cDNAs from Euglena gracilis (1997)
    Springer
    Current genetics 31 (1997), S. 430-438 
    Details
    ISSN: 1432-0983
    Keywords: Key wordsEuglena gracilis ; Endosymbiosis ; Endosymbiotic gene transfer ; Molecular evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The photosynthetic protist Euglena gracilis is one of few organisms known to possess both class-I and class-II fructose-1,6-bisphosphate aldolases (FBA). We have isolated cDNA clones encoding the precursor of chloroplast class-I FBA and cytosolic class-II FBA from Euglena. Chloroplast class-I FBA is encoded as a single subunit rather than as a polyprotein, its deduced transit peptide of 139 amino acids possesses structural motifs neccessary for precursor import across Euglena's three outer chloroplast membranes. Evolutionary analyses reveal that the class-I FBA of Euglena was recruited to the chloroplast independently from the chloroplast class-I FBA of chlorophytes and may derive from the cytosolic homologue of the secondary chlorophytic endosymbiont. Two distinct subfamilies of class-II FBA genes are shown to exist in eubacteria, which can be traced to an ancient gene duplication which occurred in the common ancestor of contemporary gram-positive and proteobacterial lineages. Subsequent duplications involving eubacterial class-II FBA genes resulted in functional specialization of the encoded products for substrates other than fructose-1,6-bisphosphate. Class-II FBA genes of Euglena and ascomycetes are shown to be of eubacterial origin, having been acquired via endosymbiotic gene transfer, probably from the antecedants of mitochondria. The data provide evidence for the chimaeric nature of eukaryotic genomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050226
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  • 4
    Electronic Resource
    Electronic Resource
    Evolution of the Rubisco operon from prokaryotes to algae: Structure and analysis of the rbcS gene of the brown alga Pylaiella littoralis (1991)
    Springer
    Plant molecular biology 17 (1991), S. 853-863 
    Details
    ISSN: 1573-5028
    Keywords: algae ; endosymbiosis ; evolution ; plastidial DNA ; Rubisco operon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The rbcS gene coding for the small subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) of the brown alga Pylaiella littoralis is located within the plastid genome and is transcribed as a single polycistronic mRNA with the gene for the large subunit of Rubisco, rbcL. The structure of the Rubisco operon from P. littoralis was determined. Molecular phylogenies for rbcS and rbcL with a wide range of prokaryotes and eukaryotes were constructed which are congruent with recent evidence for polyphyletic plastid origins. Both rbcL and rbcS of the β-purple bacterium Alcaligenes eutrophus clearly cluster with the rhodophyte and chromophyte proteins. The data suggest that the Rubisco operons of red algal and chromophytic plastids derive from β-purple eubacterial antecedents, rather than the cyanobacterial lineage of eubacteria from which other of their genes derive. This implies a lateral transfer of Rubisco genes from β-purple eubacterial ancestors to the cyanobacterial ancestor of rhodophyte and chromophyte plastids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037066
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  • 5
    Electronic Resource
    Electronic Resource
    Secondary structure and phylogeny of the chloroplast 23S rRNA gene from the brown alga Pylaiella littoralis (1993)
    Springer
    Plant molecular biology 21 (1993), S. 779-787 
    Details
    ISSN: 1573-5028
    Keywords: chloroplast evolution ; chromophyte algae ; 23S rRNA genes ; secondary structure ; nucleotide sequence ; endosymbiosis ; phylogenetic tree
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The entire nucleotide sequence of a 23S rRNA gene from the brown alga Pylaiella littoralis (L.) Kjellm has been determined. The predicted length of the 23S rRNA is 2948 nucleotides, including the 4.5S rRNA-like region at the 3′ end of the molecule. The putative transcript has been folded into a secondary structure by comparison to existing structure models, and the predicted helical regions were inspected by identifying compensatory downstream base changes. The 23S rRNA secondary structure presented here has features that are unique to P. littoralis (no other chromophyte or red algal 23S rRNA sequences are yet available), but has none of the features specific to the chloroplast rRNAs of green plants and green algae. The Pylaiella sequence was aligned with analogous plastidial and eubacterial gene sequences, and the alignment was used to construct a phylogenetic tree. The plastidial sequences formed a coherent cluster closely associated with the 23S rRNA of the cyanobacterium Anacystis nidulans. Within the plastid group, the P. littoralis sequence was most closely related to that of Euglena gracilis confirming earlier analyses based upon 16S rRNA sequences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027111
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  • 6
    Electronic Resource
    Electronic Resource
    Evolutionary analysis of 58 proteins encoded in six completely sequenced chloroplast genomes: Revised molecular estimates of two seed plant divergence times (1997)
    Springer
    Plant systematics and evolution 206 (1997), S. 337-351 
    Details
    ISSN: 1615-6110
    Keywords: Seed plants ; molecular phylogeny ; chloroplast DNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fifty-eight homologous protein sequences from the completely sequenced chloroplast genomes ofZea mays, Oryza sativa, Nicotiana tabacum, Pinus thunbergii, Marchantia polymorpha andPoryphyra purpurea were investigated. Analyzed individually, only 40 of the 58 proteins gave the true, known topology for these species. Trees constructed from the concatenated 14295 amino acid alignment and from automatically generated subsets of the data containing successively fewer polymorphisms were used to estimate theNicotiana-Zea andPinus-angiosperm divergence times as 160 and 348 million years, respectively, with an uncertainty of about 10%. These estimates based upon phylogenetic analysis of protein data from complete chloroplast genomes are in much better accordance with current interpretations of fossil evidence than previous molecular estimates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987956
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