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Zn(II)-alloferon complexes - Similar sequence, different coordination modes, no antibacterial activity
Dorota Dudek1, Adriana Miller1, Sara Draghi2
1Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50-383 Wroclaw, Poland.
Journal of Inorganic Biochemistry
|October 22, 2020
Summary
Researchers investigated zinc(II) complexes with alloferon peptides, expecting antimicrobial activity. Instead, they detailed the bioinorganic chemistry, revealing distinct coordination patterns and enhanced stability in Zn(II)-alloferon 1, but found no antibacterial or antifungal effects.
Area of Science:
- Bioinorganic Chemistry
- Metallopeptide Interactions
- Coordination Chemistry
Background:
- Alloferons are peptides with potential biological activities.
- Metal complexes are explored for therapeutic applications.
- Understanding peptide-metal coordination is crucial for bioinorganic chemistry.
Purpose of the Study:
- To investigate the bioinorganic chemistry of zinc(II)-alloferon complexes.
- To determine the coordination patterns of alloferon 1 and 2 with Zn(II) at physiological pH.
- To assess the antibacterial and antifungal activity of these complexes.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy to study coordination.
- Thermodynamic stability analysis.
- Antimicrobial assays (antibacterial and antifungal).
Main Results:
- Zn(II)-alloferon 1 exhibits a histamine-like binding mode involving His-1, His-6, and His-9.
- Zn(II)-alloferon 2 shows coordination involving the N-terminal amine and all three histidines.
- Zn(II)-alloferon 1 complex demonstrates significantly enhanced thermodynamic stability compared to the Zn(II)-alloferon 2 analogue.
- No antibacterial or antifungal activity was detected for either alloferon or their Zn(II) complexes.
Conclusions:
- The coordination chemistry of Zn(II) with alloferons is sequence-dependent, influencing complex stability.
- The observed coordination patterns do not confer antibacterial or antifungal properties.
- This study elucidates the bioinorganic coordination of Zn(II)-alloferon complexes, highlighting stability differences but refuting antimicrobial activity.
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