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[Aggregation of poly-L-proline in aqueous solution]

B A Grishkovskiĭ, T B Khromova, Iu A Lazarev

    Molekuliarnaia Biologiia
    |March 1, 1981
    PubMed
    Summary

    Poly-L-proline forms aggregates with hexagonal packing even before precipitation. Heating causes crystallization of these aggregates, leading to poly-L-proline II precipitation.

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    Area of Science:

    • Biophysics
    • Polymer Science
    • Spectroscopy

    Context:

    • Poly-L-proline (PLP) is a polypeptide with unique structural properties.
    • Understanding PLP's aggregation behavior is crucial for its applications.
    • Previous studies indicated precipitation of PLP II at specific temperatures.

    Purpose:

    • To investigate the aggregation state of form II poly-L-proline in aqueous solution and solid state using infrared spectroscopy.
    • To correlate spectral changes with temperature-induced precipitation.
    • To elucidate the structural characteristics of PLP aggregates.

    Summary:

    • Infrared spectra of poly-L-proline II in D2O solution and solid state were analyzed across a temperature range including precipitation.
    • Analysis revealed peptide C=O groups interacting with water, indicating aggregation even below precipitation temperatures.
    • Poly-L-proline is proposed to form hexagonal aggregates of 40-50 chains, which crystallize upon heating, causing precipitation.

    Impact:

    • Provides insights into the pre-precipitation aggregation behavior of poly-L-proline.
    • Suggests a mechanism for temperature-induced precipitation involving aggregate crystallization.
    • Contributes to understanding polypeptide self-assembly and phase transitions.

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