[Applicability of the fluorescence-detected circular dichroism method for the determination of the secondary structure of glucagon and albumin].
The fluorescence detected circular dichroism (FDCD) spectra of dansyl-leucine are reported. These spectra were obtained with the use of an unique device. FDCD, circular dichroism (CD) and absorption spectra of dansyl-leucine are combined to calculate CD spectra of the dansyl group in the given environment. A new method for determination of the secondary protein structure from the CD spectra taking into account the contribution of tryptophan residues is proposed. This contribution is defined from FDCD. The secondary structure of glucagon and human serum albumin, all containing a single, fluorescent tryptophan, were analysed. A good correspondence between these results and those reported for glucagon structure were found, while the usual method (without determination on tryptophan contribution) leads to unsatisfactory results.
Tret'iakov
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Efremov
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D002942:Circular Dichroism; D003619:Dansyl Compounds; D005934:Glucagon / Q000032:analysis*; D006801:Humans; D007202:Indicators and Reagents; D011487:Protein Conformation; D012709:Serum Albumin / Q000032:analysis*; D013050:Spectrometry, Fluorescence; D014364:Tryptophan / Q000032:analysis
D003619:Dansyl Compounds; D007202:Indicators and Reagents; D012709:Serum Albumin; D014364:Tryptophan; D005934:Glucagon
Primenimost' metoda fluorestsentno detektiruemogo krugovogo dikhroizma dlia opredeleniia vtorichnoĭ struktury gliukagona i al'bumina.