Astrobiology: October 2012 Archives

'Arsenic-life' bacterium prefers phosphorous after all, Nature

"Tawfik says that he was shocked by how good the proteins were at discriminating between the essential phosphate and the deadly arsenate. This does not mean that arsenate does not get into the bacteria, he points out. "It just shows that this bacterium has evolved to extract phosphate under almost all circumstances." The exceedingly high preference for phosphorous found in the key proteins in that species represent "just the last nail in the coffin" of the hypothesis that GFAJ-1 uses arsenic in its DNA, says Tawfik."

The molecular basis of phosphate discrimination in arsenate-rich environments, Nature

NASA's Big Arsenic-Based Life Claim Was Wrong, earlier post



Monthly Archives

About this Archive

This page is an archive of entries in the Astrobiology category from October 2012.

Astrobiology: September 2012 is the previous archive.

Astrobiology: November 2012 is the next archive.

Find recent content on the main index or look in the archives to find all content.