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  • Title: Ferredoxin from Aphanothece halophitica, a unicellular blue-green alga: close relationship to ferredoxins from filamentous blue-green algae and phylogenetic implications.
    Author: Hase T, Inoue K, Hagihara N, Matsubara H, Williams MM, Rogers LJ.
    Journal: J Biochem; 1983 Nov; 94(5):1457-64. PubMed ID: 6418732.
    Abstract:
    The amino acid sequence of a ferredoxin from a unicellular blue-green alga, Aphanothece halophitica, was established by the conventional methods. Total number of residues was 98 lacking only tryptophan. A most probable phylogenetic tree was constructed for 19 algal ferredoxins on the basis of an amino acid difference matrix made from the sequence comparison. A. halophitica has been classified as a unicellular blue-green alga in the same genus to which Aphanothece sacrum belongs, but the tree indicates A. halophitica ferredoxin to be very close to those of the members of filamentous blue-green algae. The tree divides prokaryotic and eukaryotic algal ferredoxins into several groups, suggesting that the ferredoxin phylogenetic tree reflects the evolutionary trails of various algae, which is also reflected in the structural characteristics, particularly in the presence of gaps. Other notable features are presented in considering algal taxonomy.
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