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Microorganisms 2017, 5(2), 20; doi:10.3390/microorganisms5020020

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

Department of Microbiology, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
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Academic Editor: Anna H. Kaksonen
Received: 20 March 2017 / Revised: 12 April 2017 / Accepted: 16 April 2017 / Published: 19 April 2017
(This article belongs to the Special Issue Microorganisms for Environmental and Industrial Applications)
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Abstract

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. View Full-Text
Keywords: tellurite; tellurate; tellurium; reduction; aerobic anoxygenic phototroph tellurite; tellurate; tellurium; reduction; aerobic anoxygenic phototroph
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MDPI and ACS Style

Maltman, C.; Donald, L.J.; 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, 20.

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