2. Academic Validation
  3. A natural fluorescent protein for ciprofloxacin sensing and mechanism study using molecular docking and circular dichroism

A natural fluorescent protein for ciprofloxacin sensing and mechanism study using molecular docking and circular dichroism

  • Anal Chim Acta. 2022 Aug 15:1221:340082. doi: 10.1016/j.aca.2022.340082.
Mogos Girmatsion 1,  Han Dong 2,  Bereket Abraha 3,  Abdu Mahmud 2,  Madhubabu Kasimala 3,  Henok Gebremedhin 4,  Awet Adhanom 4,  Gang Lu 5,  Fangwei Yang 2,  Yahui Guo 6
Affiliations

Affiliations

  • 1 State Key Laboratory of Food Science and Technology, National Centre for Technology Innovation on Fast Biological Detection of Grain Quality and Safety, School of Food Science and Technology, Jiangnan University, Wuxi, 214122, China; Department of Food Science and Technology, Hamelmalo Agricultural College, Keren, Eritrea.
  • 2 State Key Laboratory of Food Science and Technology, National Centre for Technology Innovation on Fast Biological Detection of Grain Quality and Safety, School of Food Science and Technology, Jiangnan University, Wuxi, 214122, China.
  • 3 Department of Food Science and Technology, Hamelmalo Agricultural College, Keren, Eritrea.
  • 4 Quality Control Laboratory, Ministry of Marine Resources, Massawa, Eritrea.
  • 5 Food Safety Research Center, Safety & Quality Management Department, Inner Mongolia Mengniu Dairy (group) CO., LTD. Hohhot, 011500, China.
  • 6 State Key Laboratory of Food Science and Technology, National Centre for Technology Innovation on Fast Biological Detection of Grain Quality and Safety, School of Food Science and Technology, Jiangnan University, Wuxi, 214122, China. Electronic address: [email protected].
PMID: 35934392 DOI: 10.1016/j.aca.2022.340082
Abstract

Ciprofloxacin (CIP) is one of the common drug pollutants whose residues are often detected in the environment. In the current work, CIP was studied in aqueous environment based on a natural fluorescing compound called phycocyanin (PC). Using, a Spectro fluorophotometer, fluorescence detection of CIP was performed, and absorbance properties were studied using a UV-Visible spectrophotometer. In addition, a circular dichroism (CD) spectrophotometer and molecular docking analysis were implemented for further investigation. As the fluorometric measurement results showed, the fluorescence intensity of PC dropped linearly upon the addition of increasing amounts of CIP ranging from 0 to 120 μmol/L of final concentrations, with the limit of detection reaching down to 95 nM. In addition, the fluorescent sensor was found to be more selective towards CIP when tested against Other six Antibiotics and six pesticides. In the case of analysis of the PC-CIP interaction using a CD spectrophotometer the α-helix content of PC decreased in the presence of CIP, which is an indication of conformational changes in the secondary structure of PC. Moreover, the molecular docking analysis of the PC-CIP interaction assisted in locating the three sites where CIP binds with CIP, which in turn provided additional instances of the interaction mechanism between PC and CIP.

Keywords

Ciprofloxacin; Detection; Fluorophore; Molecular docking; Phycocyanin.

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