FIELD: medicine.
SUBSTANCE: invention represents mutant photoprotein for determining intracellular calcium simultaneously in different cell organelles, which possesses light0emitting function and is characterised by amino acid sequence of wild type calcium-regulated photoprotein, in which natural residues of phenylalanine, related to conservative regions of said sequence and corresponding to residue 119 of photoprotein obelin Obelia longissima, as well as to residue 88 of obelin Obelia longissima, are substituted with other residues, different from phenylalanine, substitution of which results in the reduction of sensitivity of calcium-regulated photoprotein to calcium ions in comparison with wild type photoprotein and change of emitted light wavelength in comparison with wild type photoprotein. Invention also relates to one more mutant protein, which has substitution in position 144 of photoprotein obelin Obelia longissima. Invention also relates to DNA, which codes said proteins, as well as to vectors for expression of proteins.
EFFECT: invention allows to obtain novel forms of photoprotein with changed sensitivity to calcium and changes wavelength of emitted light.
13 cl, 5 dwg, 4 ex
