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Comment
. 2009 Jan 30;323(5914):583; author reply 583.
doi: 10.1126/science.1164967.

Comment on "Arsenic (III) fuels anoxygenic photosynthesis in hot spring biofilms from Mono Lake, California"

B Schoepp-Cothenet  1 , S Duval, J M Santini, W Nitschke
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Comment

Comment on "Arsenic (III) fuels anoxygenic photosynthesis in hot spring biofilms from Mono Lake, California"

B Schoepp-Cothenet et al. Science. .

Abstract

Kulp et al. (Reports, 15 August 2008, p. 967) described a bacterium able to photosynthetically oxidize arsenite [As(III)] via arsenate [As(V)] reductase functioning in reverse. Based on their phylogenetic analysis of As(V) reductase, they proposed that this enzyme was responsible for the anaerobic oxidation of As(III) in the Archean. We challenge this proposition based on paleogeochemical, bioenergetic, and phylogenetic arguments.

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