A tyrosine residue deprotonates during oxygen reduction by the caa3 reductase from Rhodothermus marinus

Pereira MM, Sousa FL, Teixeira M, Nyquist RM, Heberle J (2006)
FEBS LETTERS 580(5): 1350-1354.

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Abstract
Heme-copper oxygen reductases catalyze proton translocation across the cellular membrane; this takes place during the reaction of oxygen to water. We demonstrate with attenuated total reflection-Fourier transform infrared (ATR-FTIR) difference spectroscopy that a tyrosine residue of the oxygen reductase from the thermobalophilic Rhodothermus marinus becomes deprotonated in the transition from the oxidized state to the catalytic intermediate ferryl state Pm. This tyrosine residue is most probably Y256, the helix VI tyrosine residue proposed to substitute for the D-channel glutamic acid that is absent in this enzyme. Comparison with the mitochondrial like oxygen reductase from Rhodobacter sphaeroides suggests that proton transfer from a strategically situated donor to the active site is a crucial step in the reaction mechanism of oxygen reductases. (c) 2006 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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Pereira MM, Sousa FL, Teixeira M, Nyquist RM, Heberle J. A tyrosine residue deprotonates during oxygen reduction by the caa3 reductase from Rhodothermus marinus. FEBS LETTERS. 2006;580(5):1350-1354.
Pereira, M. M., Sousa, F. L., Teixeira, M., Nyquist, R. M., & Heberle, J. (2006). A tyrosine residue deprotonates during oxygen reduction by the caa3 reductase from Rhodothermus marinus. FEBS LETTERS, 580(5), 1350-1354.
Pereira, M. M., Sousa, F. L., Teixeira, M., Nyquist, R. M., and Heberle, J. (2006). A tyrosine residue deprotonates during oxygen reduction by the caa3 reductase from Rhodothermus marinus. FEBS LETTERS 580, 1350-1354.
Pereira, M.M., et al., 2006. A tyrosine residue deprotonates during oxygen reduction by the caa3 reductase from Rhodothermus marinus. FEBS LETTERS, 580(5), p 1350-1354.
M.M. Pereira, et al., “A tyrosine residue deprotonates during oxygen reduction by the caa3 reductase from Rhodothermus marinus”, FEBS LETTERS, vol. 580, 2006, pp. 1350-1354.
Pereira, M.M., Sousa, F.L., Teixeira, M., Nyquist, R.M., Heberle, J.: A tyrosine residue deprotonates during oxygen reduction by the caa3 reductase from Rhodothermus marinus. FEBS LETTERS. 580, 1350-1354 (2006).
Pereira, MM, Sousa, FL, Teixeira, M, Nyquist, RM, and Heberle, J. “A tyrosine residue deprotonates during oxygen reduction by the caa3 reductase from Rhodothermus marinus”. FEBS LETTERS 580.5 (2006): 1350-1354.
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4 Citations in Europe PMC

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Electron transfer dynamics of Rhodothermus marinus caa3 cytochrome c domains on biomimetic films.
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