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Related Experiment Videos

A new opine derived from nopaline.

L M Hall, J L Schrimsher, K B Taylor

    The Journal of Biological Chemistry
    |June 25, 1983
    PubMed
    Summary

    Researchers synthesized nopaline and isonopaline, discovering a new opine derivative, pyronopaline. This compound is found in crown gall tumor tissue and metabolized by A. tumefaciens.

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    Area of Science:

    • Biochemistry
    • Organic Chemistry
    • Plant Pathology

    Background:

    • Opines are molecules produced by plants in response to microbial infection.
    • Nopaline and isonopaline are specific types of opines found in crown gall tumors.
    • Understanding opine synthesis and metabolism is crucial for studying plant-microbe interactions.

    Purpose of the Study:

    • To synthesize and characterize nopaline and isonopaline.
    • To identify and elucidate the structure of spontaneous derivatives formed during synthesis.
    • To confirm the presence and biological relevance of these compounds in crown gall tumors.

    Main Methods:

    • Chemical synthesis of nopaline and isonopaline.
    • Separation and purification using crystallization.
    • Characterization through elemental analysis, 1H-NMR spectroscopy, and electrophoresis.
    • Detection and analysis of compounds in crown gall tumor tissue.

    Main Results:

    • Successful synthesis and separation of nopaline and isonopaline.
    • Isolation and characterization of a novel derivative, pyronopaline, from nopaline.
    • Structural confirmation of pyronopaline as N-[4-[(aminoiminomethyl)amino]-1S-carboxybutyl]-2-pyrrolidone-5R-carboxylic acid.
    • Demonstration of pyronopaline presence in crown gall tumor tissue.
    • Evidence of pyronopaline catabolism by A. tumefaciens.

    Conclusions:

    • Pyronopaline is a newly identified opine derived from nopaline.
    • The presence and metabolism of pyronopaline in crown gall tumors highlight its role in the plant-pathogen interaction.
    • This discovery deepens the understanding of opine diversity and function in Agrobacterium tumefaciens-induced tumorigenesis.

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