Erythromonas ursincola, 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 Vmax of 5.15 µmol/min/mg protein and a Km of 3.36 mM. The enzyme can also reduce tellurate with a Vmax and Km of 1.08 µmol/min/mg protein and 1.44 mM, respectively. This is the first purified membrane associated Te oxyanion reductase.
CITATION STYLE
Maltman, C., Donald, L. J., & Yurkov, V. (2017). Tellurite and tellurate reduction by the aerobic anoxygenic phototroph erythromonas ursincola, strain kr99 is carried out by a novel membrane associated enzyme. Microorganisms, 5(2). https://doi.org/10.3390/microorganisms5020020
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