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Disulfide luminescence. Emission characteristics of cyclic tetrapeptide disulfides

Mathew, MK and Ravi, A and Balaram, P (1981) Disulfide luminescence. Emission characteristics of cyclic tetrapeptide disulfides. In: Biochemical and Biophysical Research Communications, 103 (2). pp. 498-504.

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Abstract

Luminescence has been detected in cyclic tetrapeptide disulfides containing only nonaromatic residues. Excitation of the S-S- n-cr transition between 280 and 290 nm leads to.ernission in the region 300-340 nm. The position and intensity of the emission band depends on the stereochemistry of the peptide and polarity of the solvent. Quantum yields ranging from 0.002 to 0.026 have been determined. Disulfide luminescence is quenched by oxygen and enhanced in solutions saturated with nitrogen. Contributions from disulfide linkages should be considered, when analysing the emission spectra of proteins, lacking tryptophan but having a high cystine content.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Depositing User: Manjula Kadadallimath
Date Deposited: 18 May 2009 09:44
Last Modified: 19 Sep 2010 05:31
URI: http://eprints.iisc.ac.in/id/eprint/20075

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