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Related Experiment Videos

Isolation and characterization of a cDNA encoding rat cationic trypsinogen.

T S Fletcher, M Alhadeff, C S Craik

    Biochemistry
    |June 2, 1987
    PubMed
    Summary

    Researchers isolated rat cationic trypsinogen cDNA, revealing an unusual activation peptide and insights into trypsin evolution. This finding helps understand the divergence of anionic and cationic trypsins.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Evolutionary Biology

    Background:

    • Trypsinogens are precursors to trypsin, crucial digestive enzymes.
    • Mammalian trypsins exist as cationic and anionic forms with distinct properties.

    Purpose of the Study:

    • To isolate and characterize rat cationic trypsinogen.
    • To investigate the evolutionary relationship between cationic and anionic trypsins.
    • To identify unique structural features of rat cationic trypsinogen.

    Main Methods:

    • Immunoscreening of a rat pancreas cDNA library.
    • Amino acid sequence analysis and homology comparisons.
    • Structural analysis of activation peptides.

    Main Results:

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    • Successfully isolated cDNA encoding rat cationic trypsinogen.
    • Rat cationic trypsinogen exhibits high homology to anionic forms but lower homology to other mammalian cationic trypsins.
    • An unusual activation peptide with five aspartic acid residues was identified.
    • Charge differences, particularly in the C-terminal region, were observed between cationic and anionic trypsins.

    Conclusions:

    • The divergence of anionic and cationic trypsins likely predates the rodent-ungulate split.
    • The unique activation peptide may influence enzyme function.
    • Charge variations in the C-terminal substrate-binding site could affect substrate hydrolysis rates.