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A structural model for maize zein proteins

P Argos, K Pedersen, M D Marks

    The Journal of Biological Chemistry
    |September 10, 1982
    PubMed
    Summary
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    A structural model for maize zein proteins suggests a conformation of nine antiparallel helices. This helical structure explains the physical properties of these important seed storage proteins.

    Area of Science:

    • Biochemistry
    • Structural Biology
    • Plant Science

    Background:

    • Maize zein proteins are crucial seed storage proteins.
    • Understanding their molecular structure is key to their function.

    Purpose of the Study:

    • To propose a molecular conformation model for two maize zein proteins (19,000 and 22,000 apparent molecular weights).
    • To correlate the proposed structure with observed physical properties of zein proteins.

    Main Methods:

    • Analysis of amino acid sequences of maize zein proteins.
    • Circular dichroism spectroscopy in methanol solution (190-240 nm range).
    • Structure-property relationship analysis based on residue characteristics and sequence repeats.

    Main Results:

    Related Experiment Videos

    • Zein protein secondary structure is predominantly helical.
    • A model proposing nine adjacent, antiparallel helices within a distorted cylinder.
    • Polar residues facilitate intra- and intermolecular hydrogen bonding, enabling planar arrangement.
    • Glutamine-rich turns promote stacking of molecular planes through side chain interactions.

    Conclusions:

    • The proposed helical, cylindrical model explains the observed physical properties of maize zein proteins.
    • This structural insight is vital for understanding zein protein function and potential applications.