Abstract
2-Aminoethanesulfonic acid (taurine)/α-ketoglutarate (αKG) dioxygenase (TauD) is a mononuclear non-heme iron enzyme that catalyzes the hydroxylation of taurine to generate sulfite and aminoacetaldehyde in the presence of O2, αKG, and Fe(II). Fe(II)TauD complexed with αKG or succinate, the decarboxylated product of αKG, reacts with O2 in the absence of prime substrate to generate 550- and 720-nm chromophores, respectively, that are interconvertible by the addition or removal of bound bicarbonate and have resonance Raman features characteristic of an Fe(III)–catecholate complex. Mutagenesis studies suggest that both reactions result in the self-hydroxylation of the active-site residue Tyr73, and liquid chromatography nano-spray mass spectrometry/mass spectrometry evidence corroborates this result for the succinate reaction. Furthermore, isotope-labeling resonance Raman studies demonstrate that the oxygen atom incorporated into the tyrosyl residue derives from H2 18O and 18O2 for the αKG and succinate reactions, respectively, suggesting distinct mechanistic pathways. Whereas the αKG-dependent hydroxylation likely proceeds via an Fe(IV)=O intermediate that is known to be generated during substrate hydroxylation, we propose Fe(III)–OOH (or Fe(V)=O) as the oxygenating species in the succinate-dependent reaction. These results demonstrate the two oxygenating mechanisms available to enzymes with a 2-His-1-carboxylate triad, depending on whether the electron source donates one or two electrons.
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Abbreviations
- αKG:
-
α-Ketoglutarate
- DOPA:
-
Dihydroxyphenylalanine
- HPPD:
-
4-Hydroxyphenylpyruvate dioxygenase
- HppE:
-
(S)-2-Hydroxypropylphosphonic acid epoxidase
- LC/MS/MS:
-
Liquid chromatography nano-spray mass spectrometry/mass spectrometry
- PheH:
-
Phenylalanine hydroxylase
- PMI:
-
Phosphomannose isomerase
- RNR R2:
-
R2 subunit of ribonucleotide reductase
- TauD:
-
Taurine/αKG dioxygenase
- TfdA:
-
2,4-Dichlorophenoxyacetate/αKG dioxygenase
- Tris:
-
Tris(hydroxymethyl)aminomethane
- TyrH:
-
Tyrosine hydroxylase
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Acknowledgements
This work was supported by grants from the National Institutes of Health, GM33162 (to L.Q.) and GM063584 (to R.P.H.), a Chemistry Biology Interface Traineeship to K.D.K. (GM08700), and a postdoctoral fellowship to M.J.R (GM20196). We thank Piotr K. Grzyska for providing purified TauD for some of these studies.
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Koehntop, K.D., Marimanikkuppam, S., Ryle, M.J. et al. Self-hydroxylation of taurine/α-ketoglutarate dioxygenase: evidence for more than one oxygen activation mechanism. J Biol Inorg Chem 11, 63–72 (2006). https://doi.org/10.1007/s00775-005-0059-4
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DOI: https://doi.org/10.1007/s00775-005-0059-4