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New perspectives on bacterial ferredoxin evolution.

D G George, L T Hunt, L S Yeh

    Journal of Molecular Evolution
    |January 1, 1985
    PubMed
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    Bacterial ferredoxin evolution involved gene transposition after duplication. Reanalyzing sequences reveals new evolutionary relationships and distinct ferredoxin groups based on iron-sulfur cluster binding.

    Area of Science:

    • Biochemistry
    • Evolutionary Biology
    • Molecular Biology

    Background:

    • Bacterial ferredoxins are crucial electron transport proteins.
    • Previous studies suggested ancestral intrasequence gene duplication in ferredoxin evolution.
    • Recent evidence points to a gene transposition event.

    Purpose of the Study:

    • To reexamine the evolutionary relationships among bacterial ferredoxins.
    • To derive an updated evolutionary tree incorporating new findings.
    • To classify ferredoxin groups based on sequence and iron-sulfur cluster binding properties.

    Main Methods:

    • Sequence comparison of diverse bacterial ferredoxin proteins.
    • Phylogenetic analysis to construct an evolutionary tree.
    • Identification of conserved domains and iron-sulfur cluster binding sites.

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    Main Results:

    • Bacterial ferredoxins can be grouped into clostridial-type, Azotobacter-type, and anaerobic/photosynthetic sulfur bacteria types.
    • The amino-terminal domain of Azotobacter-type ferredoxins is homologous to the carboxyl-terminal domain of anaerobic photosynthetic bacteria ferredoxins.
    • Some ferredoxins show evidence of lost or partially lost Fe:S cluster binding sites, binding only one cluster instead of two.
    • Methanosarcina barkeri and Desulfovibrio desulfuricans ferredoxin II exhibit strong evidence of internal gene duplication.

    Conclusions:

    • Gene transposition significantly impacted bacterial ferredoxin evolution.
    • Sequence analysis reveals distinct evolutionary lineages and functional adaptations in ferredoxins.
    • Understanding these relationships provides insights into protein evolution and iron-sulfur cluster biochemistry.