Arsenate: Difference between revisions

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In 2008, bacteria were discovered that employ a version of [[photosynthesis]] with arsenites as [[electron donor]]s, producing arsenates (just like ordinary photosynthesis uses water as electron donor, producing molecular oxygen). The researchers conjectured that historically these photosynthesizing organisms produced the arsenates that allowed the arsenate-reducing bacteria to thrive.<ref>[http://www.rsc.org/chemistryworld/News/2008/August/15080802.asp Arsenic-loving bacteria rewrite photosynthesis rules], Chemistry World, 15 August 2008</ref>
 
In 2010, a team at [[NASA]]'s [[NASA Astrobiology Institute|Astrobiology Institute]] cultured samples of arsenic-resistant [[GFAJ-1]] bacteria from [[Mono Lake]], using a medium high in arsenate and low in phosphate concentration. The findings suggest that the bacteria may partially incorporate arsenate in place of phosphate in some biomolecules, including DNA,<ref>[http://www.sciencemag.org/content/early/2010/12/01/science.1197258.short A Bacterium That Can Grow by Using Arsenic Instead of Phosphorus]. Wolfe-Simon F, Blum JS, Kulp TR, Gordon GW, Hoeft SE, Pett-Rdige J, Stolz JF, Webb SM, Weber PK, Davies PCW, Anbar AD, Oremland RS. ''Science'' Express. 02 December 2010.</ref><ref>[http://www.wired.com/wiredscience/2010/12/nasa-finds-arsenic-life-form/ NASA Finds New Arsenic-Based Life Form in California], ''Wired Science'', Dec 2 2010</ref> butHowever, these claims were immediately debated and critiqued in correspondence to the validityoriginal journal of thispublication,<ref>Wolfe-Simon, claimF., isBlum, stillJ.S., beingKulp, debatedT.R., Gordon, G.W., Hoeft, S.E., Pett-Ridge, J., Stolz, J.F., Webb, S.M., Weber, P.K., Davies, P.C.W., Anbar, A.D. & Oremland, R.S. Response to Comments on "A Bacterium That Can Grow Using Arsenic Instead of Phosphorus, Science, 27 May 2011, and references therein. Bibcode 2011Sci...332.1149W. doi:10.1126/science.1202098. Accessed 30 May 2011</ref>[ and have since come to be widely disbelieved.<ref>Drahl, C. The Arsenic-Based-Life Aftermath. Researchers challenge a sensational claim, while others revisit arsenic biochemistry, Chem Eng News 90(5), 42-47, January 30, 2012. http://onlinelibrarycen.wileyacs.comorg/doiarticles/10.111190/j.1574i5/Arsenic-6968Based-Life-Aftermath.2010.02202.xhtml; accessed 13 October 2012</abstractref> NovelReports expansionrefuting the most significant aspects of livingthe chemistryoriginal orresults justhave abeen seriouspublished mistake?]in the journal of the original research in 2012, including by researchers from the University of British Columbia and Princeton University.<ref>Science. July Silver8, S2012. GFAJ-1 Is an Arsenate-Resistant, PhungPhosphate-Dependent LTOrganism. ''FEMSdoi: Microbiology10.1126/science.1218455. Letters''Accessed July 10, 2012.</ref><ref>Science. 12July January8, 20112012. Absence 315:of 79Detectable Arsenate in DNA from Arsenate-80Grown GFAJ-1 Cells.</ref>
 
==See also==
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