Abstract
Reactive oxygen species (ROS) readily oxidize the sulfur-containing amino acids cysteine and methionine (Met). The impact of Met oxidation on the fast inactivation of the skeletal muscle sodium channel NaV1.4 expressed in mammalian cells was studied by applying the Met-preferring oxidant chloramine-T or by irradiating the ROS-producing dye Lucifer Yellow in the patch pipettes. Both interventions dramatically slowed down inactivation of the sodium channels. Replacement of Met in the Ile–Phe–Met inactivation motif with Leu (M1305L) strongly attenuated the oxidizing effect on inactivation but did not eliminate it completely. Mutagenesis of Met1470 in the putative receptor of the inactivation lid also markedly diminished the oxidation sensitivity of the channel, while that of other conserved Met residues in intracellular linkers connecting the membrane-spanning segments (442, 1139, 1154, 1316, 1469) were of minor importance. The results of mutagenesis, assays of other NaV channel isoforms (NaV1.2, NaV1.5, NaV1.7), and the kinetics of the oxidation-induced removal of inactivation collectively indicate that multiple Met residues need to be oxidized to completely impair inactivation. This arrangement using multiple Met residues confers a finely graded oxidative modulation of NaV channels and allows organisms to adapt to a variety of oxidative stress conditions, such as ischemic reperfusion.
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Acknowledgments
This work was supported by Deutsche Forschungsgemeinschaft (HE2993/7-1, S.H.H.), IZKF/TMWFK (B307-04004, S.H.H.), and National Institutes of Health (T.H.). We thank J. Trimmer for providing cDNA coding for rNaV1.4, N. Klugbauer for hNaV1.7, S. Noda for rNaV1.2, A. George for hNaV1.5, and S. Arend and A. Rossner for technical assistance.
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Kassmann, M., Hansel, A., Leipold, E. et al. Oxidation of multiple methionine residues impairs rapid sodium channel inactivation. Pflugers Arch - Eur J Physiol 456, 1085–1095 (2008). https://doi.org/10.1007/s00424-008-0477-6
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DOI: https://doi.org/10.1007/s00424-008-0477-6