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Energy transfer between protein and DNA in nucleoprotein.

SummaryThe behaviour of the excited states formed in DNA, protein and nucleoprotein following ionizing irradiation has been studied by observing the associated luminescence. Emission spectra and decay kinetics have been recorded over a temperature range of 93°K to 300°K and from 5 µsec to 20 sec after the start of a 1·6 µsec electron pulse. The nucleohistone emission spectrum is from the DNA constituent, but its emission decay kinetics show characteristics of both constituents. There appears to be a transfer of excitation energy from histone to DNA at the level of the lowest triplet states. Such a transfer is confirmed by measurements of the luminescence yields. A model, describing the electronic transitions following irradiation, is proposed to account for these results.