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Related Experiment Videos

Structural relationships in the two-zinc insulin hexamer.

E J Dodson, G G Dodson, D C Hodgkin

    Canadian Journal of Biochemistry
    |June 1, 1979
    PubMed
    Summary

    Detailed analysis of two-Zn pig insulin reveals structural similarities and differences between its two independent molecules. Conformational flexibility may influence insulin's biological activity.

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    Area of Science:

    • Biochemistry
    • Structural Biology
    • Crystallography

    Background:

    • Insulin's structure is crucial for its biological function.
    • Understanding insulin's conformational states is key to its activity.

    Purpose of the Study:

    • To refine the crystal structure of two-Zn pig insulin.
    • To compare the two independent molecules within the insulin dimer.
    • To describe molecular interactions at monomer, dimer, and hexamer levels.

    Main Methods:

    • X-ray crystallography with 1.5-Å resolution data.
    • Fourier and fast Fourier least-squares refinement methods.

    Main Results:

    • High agreement in main chain structures between the two molecules, with exceptions at A-chain N-terminus and B-chain C-terminus.
    • Close adherence to two-fold symmetry along local axes, except for B25 side chain.
    • Greater structural discrepancies observed away from the symmetry axis.

    Conclusions:

    • The two independent molecules in the two-Zn insulin dimer exhibit high structural similarity.
    • Insulin's capacity for conformational variation is likely significant for its biological activity.

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