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Nitrosation of peptides.

B C Challis, A R Hopkins, J R Milligan

    IARC Scientific Publications
    |January 1, 1984
    PubMed
    Summary

    This study details the first N-nitrosopeptide synthesis and stability. N-nitrosopeptides decompose differently in acidic versus neutral/alkaline conditions, with implications for gastric cancer risk.

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    Area of Science:

    • Organic Chemistry
    • Biochemistry
    • Toxicology

    Background:

    • N-nitrosopeptides are compounds of toxicological interest.
    • Their formation and stability are crucial for understanding biological risks.
    • Limited information exists on the stability of N-nitrosopeptides under physiological conditions.

    Purpose of the Study:

    • To synthesize and characterize the first authentic N-nitrosopeptide, N-(N-acetylprolyl)-N-nitroso-glycine.
    • To investigate the stability of this N-nitrosopeptide under acidic, neutral, and alkaline conditions.
    • To explore the formation and decomposition kinetics of unprotected N-nitrosopeptides in strong acid and their potential role in human gastric cancer.

    Main Methods:

    • Synthesis of N-(N-acetylprolyl)-N-nitroso-glycine.
    • Characterization of the synthesized N-nitrosopeptide.
    • Stability studies under varying pH conditions (acidic, neutral, alkaline).
    • Kinetic analysis of N-nitrosopeptide formation and decomposition in strong acid.

    Main Results:

    • Successful synthesis and characterization of N-(N-acetylprolyl)-N-nitroso-glycine, the first authentic N-nitrosopeptide.
    • Concurrent denitrosation and deamination (hydrolysis) observed in acidic media.
    • Deamination (hydrolysis) as the sole reaction pathway in neutral and alkaline solutions.
    • Reported rates for formation and decomposition of unprotected N-nitrosopeptides in strong acid.

    Conclusions:

    • N-nitrosopeptides exhibit distinct decomposition pathways dependent on pH.
    • Understanding these pathways is vital for assessing risks associated with N-nitrosopeptide formation in the gastric tract.
    • The findings contribute to the ongoing discussion regarding the potential involvement of N-nitrosopeptides in human gastric cancer.

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