Abstract
Oxidative stress can lead to various derivatives of the tyrosine residue in peptides and proteins. A typical product is 3-nitro-L-tyrosine residue (Nit), which can affect protein behavior during neurodegenerative processes, such as those associated with Alzheimer's and Parkinson's diseases. Surface enhanced Raman spectroscopy (SERS) is a technique with potential for detecting peptides and their metabolic products at very low concentrations. To explore the applicability to Nit, we use SERS to monitor tyrosine nitration in Met-Enkephalin, rev-Prion protein, and α-synuclein models. Useful nitration indicators were the intensity ratio of two tyrosine marker bands at 825 and 870 cm−1 and a bending vibration of the nitro group. During the SERS measurement, a conversion of nitrotyrosine to azobenzene containing peptides was observed. The interpretation of the spectra has been based on density functional theory (DFT) simulations. The CAM-B3LYP and ωB97XD functionals were found to be most suitable for modeling the measured data. The secondary structure of the α-synuclein models was monitored by electronic and vibrational circular dichroism (ECD and VCD) spectroscopies and modeled by molecular dynamics (MD) simulations. The results suggest that the nitration in these peptides has a limited effect on the secondary structure, but may trigger their aggregation.
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Abbreviations
- ACN:
-
Acetonitrile
- Bn:
-
Benzyl
- CCT:
-
Cartesian coordinate-based tensor transfer method
- CPCM:
-
Conductor-like polarizable continuum model
- DFT:
-
Density functional theory
- DIC:
-
N,N′-Diisopropylcarbodiimide
- DMF:
-
N,N-Dimethylmethanamide
- ECD:
-
Electronic circular dichroism
- EDT:
-
1,2-Ethanedithiol
- ESI:
-
Electrospray ionization
- Fmoc:
-
9-Fluorenylmethoxycarbonyl
- FWHH:
-
Full width (of a spectral peak) at half height
- GSH :
-
Glutathione
- HF:
-
Hartree Fock
- HOBt:
-
N-Hydroxybenzotriazole
- HPLC:
-
High-performance liquid chromatography
- IR :
-
Infrared absorption
- MALDI:
-
Matrix-assisted laser desorption/ionization
- MS:
-
Mass spectrometry
- Nit:
-
3-Nitro-L-tyrosine
- PDB id.:
-
Four letter identification code of a structure deposited in the RCSB Protein Data Bank
- PTM:
-
Posttranslational modification
- ROA:
-
Raman optical activity
- SERS:
-
Surface-enhanced Raman spectroscopy
- tBu:
-
tert-Butyl
- TEM :
-
Transmission electron microscopy
- TFA:
-
Trifluoroacetic acid
- TOF:
-
Time of flight (detection)
- TIS:
-
Triisopropyl silane
- VCD:
-
Vibrational circular dichroism
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Acknowledgements
This work was supported by the Czech Science Foundation (14-00431S, 17-00121S, 20-10144S), Research Project RVO 61388963, by European Regional Development Fund; OP RDE; Project: "Chemical biology for drugging undruggable targets (ChemBioDrug)" (No. CZ.02.1.01/0.0/0.0/16_019/0000729), and computational grants of CESNET (LM2015042) and the CERIT-SC (LM2015085).
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Niederhafner, P., Šafařík, M., Neburková, J. et al. Monitoring peptide tyrosine nitration by spectroscopic methods. Amino Acids 53, 517–532 (2021). https://doi.org/10.1007/s00726-020-02911-7
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DOI: https://doi.org/10.1007/s00726-020-02911-7