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Spinach chloroplast thioredoxins in evolutionary drift.

A Tsugita, K Maeda, P Schürmann

    Biochemical and Biophysical Research Communications
    |August 30, 1983
    PubMed
    Summary

    Spinach chloroplast thioredoxins m and f share common ancestry with E. coli thioredoxin. M-type thioredoxins show greater sequence and specificity homology, suggesting it’s a conserved prototype, while f-type has evolved distinct characteristics.

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    Area of Science:

    • Plant biochemistry
    • Molecular evolution
    • Protein structure-function relationships

    Background:

    • Thioredoxins are crucial redox proteins involved in various cellular processes.
    • Spinach chloroplasts contain distinct thioredoxin types, m and f, with differing functions.
    • Understanding their evolutionary history can illuminate their specific roles.

    Purpose of the Study:

    • To determine the amino acid sequences around the active sites of spinach chloroplast thioredoxins m and f.
    • To compare these sequences with E. coli thioredoxin to infer evolutionary relationships.
    • To investigate the correlation between sequence homology and enzymatic specificity.

    Main Methods:

    • Amino acid sequencing of spinach chloroplast thioredoxin m and f active sites.
    • Comparative sequence analysis with E. coli thioredoxin.
    • Evaluation of enzymatic specificity.

    Main Results:

    • Invariant active site sequences indicate a common ancestor for spinach thioredoxins m/f and E. coli thioredoxin.
    • M-type thioredoxins exhibit closer sequence homology and similar enzymatic specificity to E. coli thioredoxin.
    • F-type thioredoxins show lower sequence homology and distinct enzymatic specificity compared to E. coli thioredoxin.

    Conclusions:

    • The m-type thioredoxin gene likely represents a conserved evolutionary prototype.
    • The f-type thioredoxin gene has undergone mutations, leading to altered specificity.
    • These findings highlight divergent evolutionary paths within chloroplast thioredoxin families.

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