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Structural changes in R-phycoerythrin upon CdS quantum dot synthesis in tunnel cavities of protein molecules.

Abstract：

:Structural changes in R-phycoerythrin used as a matrix for the synthesis of CdS quantum dots have been analyzed by circular dichroism spectrometry. In deionized water, quantum dot synthesis in the tunnel cavity of the R-phycoerythrin molecule proved to be accompanied by uncoiling of α-helices and changes in the conformation of its chromophore groups, with consequent decay of protein fluorescence. Since R-phycoerythrin fluorescence is important for practical applications, conditions for quantum dot synthesis have been optimized by replacing deionized water with 0.01 M MES buffer, pH 5.7. Under such conditions, the size of the CdS quantum dots (determined from atomic force microscopy images) remains the same as in deionized water, but quantum dots cause only minor structural changes in protein molecules, as follows from circular dichroism and absorption spectra. The thermostability of R-phycoerythrin is enhanced, as indicated by an increase in the experimental activation energy for denaturation (from 140.8 to 149.9 kJ/mol) and the intensity of R-phycoerythrin fluorescence is also enhanced approximately twofold.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Bekasova OD,Shubin VV,Safenkova IV,Kovalyov LI,Kurganov BI

doi

10.1016/j.ijbiomac.2013.10.010

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

623-8

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(13)00554-0

journal_volume

62

pub_type

杂志文章

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