The spectral luminescence properties of aqueous solutions of the Hsp70 protein are studied, the dependence of the luminescence spectrum on the excitation wavelength is revealed, and the temperature dependence of luminescence intensity of tyrosine and tryptophan residues in the temperature interval of 20–80° C is analyzed. The luminescence method is used to determine temperature interval (42–57° C) in which protein melting takes place. An increase in the fluorescence quantum yield of tryptophan and the bathochromic ...