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EXCIPLEXES AND THE FLUORESCENCE OF STAPHYLOCOCCUS AUREUS ENDONUCLEASE *

Abstract— The family of fluorescence spectra obtained from the endonuclease of Staphylococcus aureus at temperatures from 140° to 230°K, when superimposed, show a unique intersection point at 336nm. This indicates that only two types of fluorescent species need be considered with this protein, a low‐temperature form and a high‐temperature form. Since the high‐temperature form lacks fine structure and has a large Stokes' shift, the spectral observations are consistent with the notion that high‐temperature fluorescence comes from a tryptophan that has formed a complex with a solvent molecule within its excited‐state lifetime. The absorption spectrum and both of the fluorescence spectra indicate that the tryptophan, even in the high‐temperature state, is in an environment with a low dielectric constant.