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Related Experiment Videos

Nucleotide sequence of cloned cDNA coding for preproricin.

F I Lamb, L M Roberts, J M Lord

    European Journal of Biochemistry
    |April 15, 1985
    PubMed
    Summary

    Researchers deduced the primary structure of castor bean lectin precursor protein, ricin, by sequencing complementary DNA. This reveals the genetic blueprint for the toxic A and galactose-binding B chains.

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    Area of Science:

    • Molecular Biology
    • Biochemistry
    • Plant Science

    Background:

    • Ricin is a toxic lectin from castor beans, composed of a toxic A chain and a galactose-binding B chain.
    • Understanding the ricin precursor protein's structure is crucial for studying its synthesis and function.

    Purpose of the Study:

    • To determine the primary structure of the castor bean lectin (ricin) precursor protein.
    • To elucidate the nucleotide sequence of the complementary DNA (cDNA) encoding preproricin.

    Main Methods:

    • Construction of a cDNA library from castor bean endosperm poly(A)-rich RNA.
    • Isolation of lectin mRNA sequences using hybridization with synthetic oligonucleotide probes.
    • Deduction of the entire preproricin coding sequence from overlapping cDNA clones.

    Main Results:

    • The nucleotide sequence of preproricin cDNA was determined.
    • The coding region (1695 base pairs) includes a signal sequence, the A chain (267 amino acids), and the B chain (262 amino acids) linked together.
    • The molecular masses of the signal sequence, A chain, B chain, and linking region were calculated.

    Conclusions:

    • The primary structure of the ricin precursor protein has been elucidated at the molecular level.
    • The deduced sequence provides a genetic basis for understanding ricin biosynthesis and structure-function relationships.

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