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Sequence comparisons of complementary DNAs encoding aequorin isotypes.

D C Prasher, R O McCann, M Longiaru

    Biochemistry
    |March 10, 1987
    PubMed
    Summary
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    Researchers compared aequorin cDNA sequences, revealing three isoforms with significant amino acid differences. This explains microheterogeneity in the bioluminescent photoprotein from Aequorea victoria.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Biophysics

    Background:

    • Aequorin is a calcium-activated photoprotein essential for bioluminescence in the hydromedusa Aequorea victoria.
    • Understanding aequorin's structure is crucial for its applications in biological research.

    Purpose of the Study:

    • To compare nucleotide sequences of five aequorin cDNAs.
    • To identify and characterize different aequorin isoforms.
    • To investigate the microheterogeneity observed in native aequorin.

    Main Methods:

    • Nucleotide sequence analysis of five aequorin cDNAs.
    • Deduction of amino acid sequences for aequorin isoforms.
    • Comparison of deduced sequences with native aequorin protein sequences.
    • Expression of aequorin in Escherichia coli.

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    Main Results:

    • Identified three distinct aequorin isoforms encoded by the analyzed cDNAs.
    • Found significant nucleotide and amino acid sequence differences among isoforms.
    • Observed microheterogeneity in native aequorin, consistent with multiple isoforms.
    • Deduced that aequorin purification may lead to N-terminal residue loss.
    • Recombinant aequorin matched the properties of a native isotype.

    Conclusions:

    • The study elucidates the molecular basis of aequorin microheterogeneity.
    • Confirms the existence of multiple aequorin isoforms with distinct sequences.
    • Highlights potential N-terminal processing during aequorin extraction and purification.