JBIC Journal of Biological Inorganic Chemistry

, Volume 23, Issue 6, pp 917–927 | Cite as

Antenna effect and phosphorescence spectra to find the location of drug tetracycline in bovine β-lactoglobulin A

  • Moumita Mukherjee
  • Pinki Saha Sardar
  • Pritam Roy
  • Swagata Dasgupta
  • Maitrayee Basu RoyEmail author
  • Sanjib GhoshEmail author
Original Paper


A ternary system comprising of a Eu(III) complex of the drug Tetracycline hydrochloride (Eu3TC) bound to bovine β-lactoglobulin variant A (BLGA) in aqueous buffer at physiological pH (pH = 7.4) has been investigated to exploit the enhanced “antenna effect” to locate the bound drug and find the microenvironment of the binding site. Steady-state and time-resolved emission studies at room temperature as well as at 77 K have been carried out to evaluate the binding parameters in the binary system consisting of BLGA and tetracycline hydrochloride (TC). Low-temperature phosphorescence studies at 77 K of pure BLGA confirm Trp 19 to be the emitting residue, while Trp 61 is silent. Enhancement of BLGA phosphorescence emission in the ternary system at 77 K indicates that Trp 19 is very close to Eu(III) in the Eu3TC complex. The molecular docking results further confirm that TC binds close to Trp 19 in a hydrophobic domain. The results thus obtained can provide guidelines to design and synthesize target-oriented drugs as well as suitable bio-probes.

Graphical abstract


Antenna effect Bovine β-lactoglobulin Tetracycline Fluorescence Phosphorescence Accessible surface area 



S. G. gratefully acknowledges the Department of Science and Technology (DST), Government of India (Grant no.: SB/S1/PC-003/2013), and MBR gratefully acknowledges UGC [Minor Research Project No.F.PS-146/15-16 (ERO)] for financially supporting this work.

Supplementary material

775_2018_1591_MOESM1_ESM.doc (648 kb)
Supplementary material 1 (DOC 648 kb)


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Copyright information

© SBIC 2018

Authors and Affiliations

  • Moumita Mukherjee
    • 1
  • Pinki Saha Sardar
    • 2
  • Pritam Roy
    • 3
  • Swagata Dasgupta
    • 3
  • Maitrayee Basu Roy
    • 4
    Email author
  • Sanjib Ghosh
    • 5
    Email author
  1. 1.Sri Aurobindo VidyamandirChandannagarIndia
  2. 2.The Department of ChemistryThe Bhawanipur Education Society CollegeKolkataIndia
  3. 3.Department of ChemistryIndian Institute of TechnologyKharagpurIndia
  4. 4.Department of ChemistryVidyasagar College for WomenKolkataIndia
  5. 5.Department of ChemistryAdamas UniversityBarasatIndia

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