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Related Experiment Videos

Structure of ristocetin A.

J R Fehlner, R E Hutchinson, D S Tarbell

    Proceedings of the National Academy of Sciences of the United States of America
    |September 1, 1972
    PubMed
    Summary

    Acid hydrolysis of ristocein A revealed unusual amino acids. Structural analysis using mass spectrometry and nuclear magnetic resonance (NMR) identified diphenyl ether derivatives with unique substitution patterns.

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    Area of Science:

    • Organic Chemistry
    • Biochemistry
    • Structural Elucidation

    Background:

    • Ristocein A is a complex natural product.
    • Understanding its constituent amino acids is crucial for deciphering its biological activity and synthetic pathways.

    Purpose of the Study:

    • To characterize the unusual amino acids obtained from the acid hydrolysis of ristocein A.
    • To elucidate the detailed structures of these novel amino acid derivatives.

    Main Methods:

    • Acid hydrolysis of ristocein A.
    • Mass spectrometry (MS) for molecular weight determination.
    • Nuclear Magnetic Resonance (NMR) spectroscopy (1D and 2D) for structural analysis, including coupling and nuclear Overhauser effect (NOE) experiments.

    Main Results:

    • Identification of two sets of diastereoisomeric amino acids derived from ristocein A.
    • One set, with molecular weight 362 (C17H18N2O7), features a diphenyl ether core with hydroxyl and alpha-amino acid groups on both rings, one ring also possessing a methyl group.
    • The second set appears to be a lower homolog lacking the aromatic methyl group.
    • NMR and NOE data provided evidence for specific substitution patterns on the diphenyl ether rings.

    Conclusions:

    • The acid hydrolysis of ristocein A yields structurally unique amino acids, including diphenyl ether derivatives.
    • Detailed structural information was obtained through advanced spectroscopic techniques (MS and NMR).
    • The findings contribute to the understanding of natural product chemistry and the structural diversity of amino acids.

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