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Volume 72, Issue 5


Dissection of the interaction between human holo-transferrin and ciprofloxacin in the presence of silver nanoparticles: spectroscopic approaches

Fatemeh Koohzad
  • Department of Biochemistry and Biophysics, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
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/ Sima Beigoli
  • Endoscopic and Minimally Invasive Surgery Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
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/ Mahtab JahanShah-Talab
  • Department of Biochemistry and Biophysics, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
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/ Maryam Kamshad
  • Department of Biochemistry and Biophysics, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
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/ Reza Assaran Darban
  • Department of Biochemistry and Biophysics, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
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/ Jamshidkhan Chamani
  • Corresponding author
  • Department of Biochemistry and Biophysics, Faculty of Sciences, Mashhad Branch, Islamic Azad University, Mashhad, Iran
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Published Online: 2017-05-30 | DOI: https://doi.org/10.1515/biolog-2017-0066


The binding of ciprofloxacin (CIP) to human holo-transferrin (HTF) in the presence of silver nanoparticles (AgNPs) has been investigated by fluorescence quenching and circular dichroism (CD) techniques as well as resonance light scattering under physiological conditions. It was determined that the intrinsic fluorescence of HTF was quenched by CIP in the presence of AgNPs through static quenching, thus confirming that a CIP-HTF complex was formed in both the binary and ternary systems. However, the analysis of HTF fluorescence quenching in these binary and ternary systems indicated that the AgNPs were affected upon complex formation between CIP and HTF and that the binding affinity between them became more substantial when the AgNPs coexisted with the drug. Fluorescence quenching proved that HTF had one class of binding sites for CIP in both binary and ternary systems. CD spectra indicated that the secondary structure of HTF changed when increasing the CIP concentration and during the simultaneous presence of CIP and AgNPs, which led to decreased contents of α-helix and, β-sheet structures in HTF, inducing destabilization of the protein.

Key words: human holo-transferrin; ciprofloxacin; circular dichroism; fluorescence quenching; Ag nanoparticle; Förster resonance energy transfer


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About the article


Received: 2017-11-18

Accepted: 2017-05-18

Published Online: 2017-05-30

Published in Print: 2017-05-24

Citation Information: Biologia, Volume 72, Issue 5, Pages 569–580, ISSN (Online) 1336-9563, ISSN (Print) 0006-3088, DOI: https://doi.org/10.1515/biolog-2017-0066.

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