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Related Experiment Videos

Four-fold structural repeat in the acid proteases.

T L Blundell, B T Sewell, A D McLachlan

    Biochimica Et Biophysica Acta
    |September 29, 1979
    PubMed
    Summary

    Acid proteases, like endothiapepsin, exhibit a four-part structure. This suggests potential gene quadruplication or convergent evolution in enzyme development.

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    Area of Science:

    • Biochemistry
    • Structural Biology
    • Enzymology

    Background:

    • Acid proteases are crucial enzymes with a conserved structural motif.
    • Previous studies identified two equivalent lobes in acid proteases related by a dyad axis.
    • Endothiapepsin serves as a model system for studying aspartic protease structures.

    Purpose of the Study:

    • To investigate the detailed quaternary structure of endothiapepsin.
    • To determine if substructures within the lobes of endothiapepsin exhibit further symmetry.
    • To explore the evolutionary implications of observed structural similarities.

    Main Methods:

    • X-ray crystallography or comparative structural analysis of endothiapepsin.
    • Computational analysis of alpha-carbon positions to assess structural equivalence.
    • Root mean square deviation (RMSD) calculations to quantify structural similarity.

    Main Results:

    • Endothiapepsin's lobes were found to contain two similar halves, each related by a local dyad axis.
    • In the first lobe, 22 alpha-carbon pairs showed equivalence with an RMSD of 1.92 Å.
    • In the second lobe, 17 alpha-carbon pairs matched within an RMSD of 2.31 Å.

    Conclusions:

    • The findings reveal a higher order of structural symmetry within endothiapepsin than previously observed in acid proteases.
    • This detailed structural symmetry supports hypotheses of either convergent evolution or gene quadruplication as evolutionary mechanisms.
    • Further research is warranted to elucidate the precise evolutionary pathway and functional significance of this intricate structure.

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