Abstract
NADH peroxidase (Npx) and mercuric ion reductase (MerA) are flavoproteins belonging to the pyridine nucleotide:disulfide oxidoreductases (PNDO) and catalyzing the reduction of toxic substrates, i.e., hydrogen peroxide and mercuric ion, respectively. To determine the role of the flavin adenine dinucleotide (FAD) in the detoxification mechanism, the resonance Raman (RR) spectra of these enzymes under various redox and ligation states have been investigated using blue and/or near-UV excitation(s). These data were compared to those previously obtained for glutathione reductase (GR), another enzyme of the PNDO family, but catalyzing the reduction of oxidized glutathione. Spectral differences have been detected for the marker bands of the isoalloxazine ring of Npx, MerA, and GR. They provide evidence for different catalytic mechanisms in these flavoproteins. The RR modes of the oxidized and two-electron reduced (EH2) forms of Npx are related to very tight flavin–protein interactions maintaining a nearly planar conformation of the isoalloxazine tricycle, a low level of H-bonding at the N1/N5 and O2/O4 sites, and a strong H-bond at N3H. They also indicate minimal changes in FAD structure and environment upon either NAD(H) binding or reduction of the sulfinic redox center. All these spectroscopic data support an enzyme functioning centered on the Cys-SO−/Cys-S− redox moiety and a neighbouring His residue. On the contrary, the RR data on various functional forms of MerA are indicative of a modulation of both ring II distortion and H-bonding states of the N5 site and ring III. The Cd(II) binding to the EH2–NADP(H) complexes, biomimetic intermediates in the reaction of Hg(II) reduction, provokes important spectral changes. They are interpreted in terms of flattening of the isoalloxazine ring and large decreases in H-bonding at the N5 site and ring III. The large flexibility of the FAD structure and environment in MerA is in agreement with proposed mechanisms involving C4a(flavin) adducts.
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Abbreviations
- PNDO:
-
Pyridine nucleotide:disulfide oxidoreductase
- Npx:
-
NADH peroxidase
- MerA:
-
Mercuric ion reductase
- GR:
-
Glutathione reductase
- BLUF:
-
Blue-light-using FAD
- pHBH:
-
p-Hydroxybenzoate hydroxylase
- ETF:
-
Electron-transfer flavoprotein
- Eox :
-
Oxidized form of Npx, MerA, or GR
- EH2 :
-
Two-electron reduced form of Npx, MerA or GR
- Ef :
-
Enterococcus faecalis
- Rm :
-
Ralstonia metallidurans
- Ec :
-
Escherichia coli
- Pa :
-
Pseudomonas aeruginosa
- Lf:
-
Lumiflavin
- Rf:
-
Riboflavin
- FMN:
-
Flavin mononucleotide
- FAD:
-
Flavin adenine dinucleotide
- Me:
-
Methyl
- Rib:
-
Ribityl
- Cys-SH:
-
Cysteine-thiol
- Cys-S− :
-
Cysteine-thiolate
- Cys-SOH:
-
Cysteine-sulfenic acid
- Cys-SO− :
-
Cysteine-sulfenate
- Cys-SO2H:
-
Cysteine-sulfinic acid
- Cys-SO3H:
-
Cysteine-sulfonic acid
- DTT:
-
1,4-Dithiothreitol
- GSH:
-
Reduced glutathione
- eq:
-
Equivalent
- RR:
-
Resonance Raman
- CT:
-
Charge transfer
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Acknowledgements
We are grateful to Dr. J. Covès, for providing the E. coli strain CM037 harbouring the Tn4378 transposon which contains a mer operon of R. metallidurans CH34, and to Drs. F. André and P. Dorlet for the helpful discussions. This work was supported in part by grants from the Commissariat à l’Energie Atomique, and the Centre National de la Recherche Scientifique.
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Five figures (RR spectra of MerA reduced with either DTT or dithionite; comparison of the RDs of Npx, MerA, and GR under the Eox state; comparison of the RDs of Npx, MerA, and GR under the EH2 states generated by NAD(P)H; RDs of GR under the Eox and EH2 states; RDs of MerA under the EH2 states generated by either DTT or dithionite) (DOCX 102 kb)
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Keirsse-Haquin, J., Picaud, T., Bordes, L. et al. Modulation of the flavin–protein interactions in NADH peroxidase and mercuric ion reductase: a resonance Raman study. Eur Biophys J 47, 205–223 (2018). https://doi.org/10.1007/s00249-017-1245-3
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DOI: https://doi.org/10.1007/s00249-017-1245-3