Abstract
Protein aggregation is related to numerous pathological conditions like Alzheimer’s and Parkinson’s disease. In our study, we have shown that an already existing FDA-approved drug; methotrexate (MTX) can be reprofiled on preformed α-chymotrypsinogen A (α-Cgn A) aggregates. The zymogen showed formation of aggregates upon interaction with mercuric ions, with increasing concentration of Hg2Cl2 (0-150 µM). The hike in ThT and ANS fluorescence concomitant with blue shift, bathochromic shift and the hyperchromic effect in the CR absorbance, RLS and turbidity measurements, substantiate the zymogen β-rich aggregate formation. The secondary structural alterations of α- Cgn A as analyzed by CD measurements, FTIR and Raman spectra showed the transformation of native β-barrel conformation to β-inter-molecular rich aggregates. The native α- Cgn A have about 30% α-helical content which was found to be about 3% in presence of mercuric ions suggesting the formation of aggregates. The amorphous aggregates were visualized by SEM. On incubation of Hg2Cl2 treated α- Cgn A with increasing concentration of the MTX resulted in reversing aggregates to the native-like structure. These results were supported by remarkable decrease in ThT and ANS fluorescence intensities and CR absorbance and also consistent with CD, FTIR, and Raman spectroscopy data. MTX was found to increase the α-helical content of the zymogen from 3 to 15% proposing that drug is efficient in disrupting the β-inter-molecular rich aggregates and reverting it to native like structure. The SEM images are in accordance with CD data showing the disintegration of aggregates. The most effective concentration of the drug was found to be 120 µM. Molecular docking analysis showed that MTX molecule was surrounded by the hydrophobic residues including Phe39, His40, Arg145, Tyr146, Thr151, Gly193, Ser195, and Gly216 and conventional hydrogen bonds, including Gln73 (bond length: 2.67Å), Gly142 (2.59Å), Thr144 (2.81Å), Asn150 (2.73Å), Asp153 (2.71Å), and Cys191 (2.53Å). This investigation will help to find the use of already existing drugs to cure protein misfolding-related abnormalities.
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Data is provided within the manuscript or supplementary information files.
Abbreviations
- α-Cgn A :
-
α-Chymotrypsinogen A
- Hg2Cl2 :
-
Mercuric chloride
- MTX:
-
Methotrexate
- µM :
-
Micromolar
- ThT:
-
Thioflavin T
- ANS:
-
8-Anilinonaphthalene-1-sulfonic acid
- CR:
-
Congo red
- CD:
-
Circular dichroism
- SEM:
-
Scanning electron microscopy
- FTIR:
-
Fourier transform infrared spectroscopy
- RLS:
-
Rayleigh scattering
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Acknowledgements
The authors are highly thankful for the facilities provided by the Department of Biochemistry, Faculty of Life Sciences, AMU, Aligarh. The authors acknowledged the Department of Chemistry, AMU, Aligarh for providing FTIR spectroscopy and USIF, AMU for providing SEM and Raman spectroscopy facility. N. K. A. is a recipient of MANF- JRF funded by the Ministry of Minority Affairs, India.
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Conceived and designed the experiments: N. K. A. and A. N. Performed the experiments: N. K. A. and A. R. Analysed the data: N.K. A. and A. N. Wrote the paper: N. K. A., A.R., and A. N. All authors reviewed the manuscript.
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Ansari, N.K., Rais, A. & Naeem, A. Methotrexate for Drug Repurposing as an Anti-Aggregatory Agent to Mercuric Treated α-Chymotrypsinogen-A. Protein J (2024). https://doi.org/10.1007/s10930-024-10187-z
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DOI: https://doi.org/10.1007/s10930-024-10187-z