Congo red fluorescence upon binding to macromolecules – a possible explanation for the enhanced intensity

• Autorzy: Zemanek G. , Jagusiak A. , Chłopaś K. , Piekarska B.

Identyfikatory

DOI

10.1515/bams-2017-0010

• Języki publikacji: EN

Abstrakty

EN

The present study attempts to explain the reason for the selective generation of an increase in intensity of Congo red (CR) fluorescence as an effect of the dye interacting with proteins and polysaccharides. This supramolecular dye, which creates ribbon-shaped micelles in aqueous solutions when excited with blue light (470 nm), presents low fluorescence with a maximum within the orange-red light range (approximately 600 nm). In the same conditions, CR-stained preparations of heat-denatured proteins, some native proteins (e.g. cell surface receptors) and cellulose show intense orange-red fluorescence when observed using a fluorescence microscope. The fluormetric measurements showed that the factors that cause the dissociation of the ribbon-shaped CR micelle – ethanol, urea, dimethyl sulfoxide (DMSO) and cholate – all contributed to a significant increase in the fluorescence intensity of the CR solutions. The fluorescence measurements of CR bound to the immunoglobulin light lambda (L λ) chain and soluble carboxymethyl cellulose (CMC) showed a fluorescence intensity which was many times higher. In the case of the denatured (65°C) immunoglobulin L λ chain, the fluorescence intensity significantly exceeded the values observed for the factors which break down the CR micelles. The dissociation of the ribbon-shaped micelles and the complexation of the monomeric CR form with polymers are two of the factors explaining the intense fluorescence of protein and polysaccharide preparations stained with CR.

Słowa kluczowe

EN

cellulose; Congo red; fluorescence; immunoglobulin; numerical analysis; self-assembling dyes

• Wydawca: Uniwersytet Jagielloński - Collegium Medicum ; De Gruyter
• Czasopismo: Bio-Algorithms and Med-Systems
• Rocznik: 2017
• Tom: Vol. 13, no. 2
• Strony: 69--78
• Opis fizyczny: Bibliogr. 35 poz., rys., wykr.

Twórcy

autor

Zemanek G.

• Jagiellonian University Medical College, Chair of Medical Biochemistry, Krakow, Poland

autor

Jagusiak A.

• Jagiellonian University Medical College, Chair of Medical Biochemistry, Krakow, Poland

autor

Chłopaś K.

• Jagiellonian University Medical College, Chair of Medical Biochemistry, Krakow, Poland

autor

Piekarska B.

• Jagiellonian University Medical College, Chair of Medical Biochemistry, Krakow, Poland

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