Tellurite and Tellurate Reduction by the Aerobic Anoxygenic Phototroph Erythromonas ursincola, Strain KR99 Is Carried out by a Novel Membrane Associated Enzyme.

Author(s) Maltman, C.; Donald, L.J.; Yurkov, V.
Journal Microorganisms
Date Published 2017 Apr 19
Abstract

, strain KR99 isolated from a freshwater thermal spring of Kamchatka Island in Russia, resists and reduces very high levels of toxic tellurite under aerobic conditions. Reduction is carried out by a constitutively expressed membrane associated enzyme, which was purified and characterized. The tellurite reductase has a molecular weight of 117 kDa, and is comprised of two subunits (62 and 55 kDa) in a 1:1 ratio. Optimal activity occurs at pH 7.0 and 28 °C. Tellurite reduction has a V of 5.15 µmol/min/mg protein and a K of 3.36 mM. The enzyme can also reduce tellurate with a V and K of 1.08 µmol/min/mg protein and 1.44 mM, respectively. This is the first purified membrane associated Te oxyanion reductase.

DOI 10.3390/microorganisms5020020
ISSN 2076-2607
Citation Maltman C, Donald LJ, Yurkov V. Tellurite and Tellurate Reduction by the Aerobic Anoxygenic Phototroph Erythromonas ursincola, Strain KR99 Is Carried out by a Novel Membrane Associated Enzyme. Microorganisms. 2017;5(2).

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