It has been determined that each FP molecular contains one Ca(2+)-binding site. By the use of fluorescence probe Tb(3+), the distance between Tb(3+) and tryptophan (Trp) residue was obtained to be 0.375. Tb(3+) ion is coordinated with FP more strongly than Ca(2+) ion, and can bind to FP and replace the Ca(2+) ion in FP completely.
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