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Related Experiment Videos

Monte Carlo calculation on trans/cis-polysarcosine

M Sisido, Y Imanishi, T Higashimura

    Macromolecules
    |May 1, 1976
    PubMed
    Summary

    Monte Carlo simulations explored polysarcosine chain conformations, including cis amide bonds. Results align with NMR data, offering insights into polypeptide structures.

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    Area of Science:

    • Polymer Chemistry
    • Computational Chemistry
    • Biophysics

    Background:

    • Polysarcosine is a synthetic polypeptide with potential applications.
    • Understanding its conformational properties is crucial for its use.
    • Previous studies have not fully explored the impact of cis amide bonds on its structure.

    Purpose of the Study:

    • To investigate the conformational behavior of polysarcosine chains using Monte Carlo simulations.
    • To incorporate cis amide bonds into the simulation model.
    • To compare simulation results with experimental Nuclear Magnetic Resonance (NMR) data.

    Main Methods:

    • Utilized a hard-sphere model for Monte Carlo simulations.
    • Calculated dipeptide energy maps for trans/cis dyad sequences.
    • Determined mean-square end-to-end distance and higher even moments.
    • Calculated end-to-end distance distribution using Nagai's equation.
    • Compared simulation data with 220-MHz NMR spectra of polysarcosine.

    Main Results:

    • Allowed regions for dihedral angles were consistent with cyclic sarcosine peptides.
    • The distribution function of end-to-end distance showed good agreement with Monte Carlo data when higher-order terms were truncated.
    • Calculated fractions of cis amide bonds and trans/cis dyads.
    • Qualitative agreement was observed between calculated and NMR data for longer chains.

    Conclusions:

    • The hard-sphere Monte Carlo model effectively simulates polysarcosine chain conformations.
    • The inclusion of cis amide bonds provides a more realistic representation of polysarcosine structure.
    • Simulation results support experimental observations from NMR spectroscopy, particularly for longer chains.

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