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Cell Calcium. 1993 May;14(5):373-8.

Light-emitting properties of recombinant semi-synthetic aequorins and recombinant fluorescein-conjugated aequorin for measuring cellular calcium.

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Marine Biological Laboratory, Woods Hole, Massachusetts.


15 kinds of recombinant semi-synthetic aequorins and a recombinant fluorescein-conjugated aequorin were prepared and their properties in Ca(2+)-triggered luminescence were studied. The semi-synthetic aequorins showed a wide range of Ca(2+)-sensitivity. The luminescence intensity of a high-sensitivity type (hcp-aequorin) was greater than 10(4)-times that of a low-sensitivity type (n-aequorin) at pCa 6.0-6.5. The fluorescein-conjugated aequorin exhibited fluorescence in addition to the Ca(2+)-triggered luminescence, thus it can be used to visualize the diffusion and distribution of aequorin in cells. The data obtained, particularly the Ca(2+)-sensitivity curves, are useful in selecting a suitable semi-synthetic aequorin for an experiment.

[Indexed for MEDLINE]

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