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Spectral characteristics of asparaginyl and valyl transfer rna synthetases from normal and long fasting rabbit muscles

, : Spectral characteristics of asparaginyl and valyl transfer rna synthetases from normal and long fasting rabbit muscles. Molekulyarnaya Biologiya (Moscow) 18(5): 1330-1335

Conformational differences between asparagyl- and valyl-tRNA synthetases from normal (ARS.eta.) and long-fasting (ARS.intg.) rabbit's muscle were revealed by means of UV fluorescence and differential spectroscopy. The fluorescence spectra indicate more hydrophobic environment of tryptophan residues in the ARS.intg. at similar quantum yields. The differential absorption spectra reveal the distinctions between tryptophanyl microenvironments for ARS's of different amino acid specificity and for ARS.eta. and ARS.intg. of the same specificity. Lower accessibility of tryptophan residues in ARS.eta. in comparison with ARS.intg. was shown by selective fluorescence quenching with Cs+ and I- ions. The effect of longwave shift of fluorescence spectra at the edge excitation was used for studies on microenvironment of chromophors and the rate of the dipole-orientational relaxation of this microenvironment.

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