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Related Experiment Videos

Subunit structure of aldolase.

E G Heidner, B H Weber, D Eisenberg

    Science (New York, N.Y.)
    |February 19, 1971
    PubMed
    Summary

    A new rabbit muscle aldolase crystal form reveals 222 symmetry, confirming identical subunit conformations. A novel method was developed to determine molecules per unit cell in older crystal forms without direct water content measurement.

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    Area of Science:

    • Biochemistry
    • Structural Biology
    • Crystallography

    Background:

    • Rabbit muscle aldolase is a key glycolytic enzyme.
    • Understanding enzyme quaternary structure is crucial for function.
    • Previous crystal forms of aldolase had ambiguous unit cell contents.

    Purpose of the Study:

    • To determine the symmetry and subunit conformation of rabbit muscle aldolase.
    • To resolve the number of molecules per unit cell in a previously reported crystal form.
    • To develop a new method for determining unit cell contents.

    Main Methods:

    • X-ray crystallography of a new rabbit muscle aldolase crystal form.
    • Analysis of diffraction data to at least 4-angstrom resolution.
    • Development and application of the "crystal-volume and protein-content method".

    Main Results:

    • The new crystal form exhibits 222 symmetry.
    • The gross conformation of the four subunits is identical.
    • The number of molecules per unit cell (n) for the older form was established.
    • The "crystal-volume and protein-content method" was validated.

    Conclusions:

    • Rabbit muscle aldolase possesses 222 symmetry in this crystal form.
    • The subunit conformation is consistent across the four subunits.
    • A reliable method for determining unit cell contents was established, aiding future crystallographic studies.

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