The discovery of a bacterium
that could substitute arsenic for phosphorus to stay alive is refuted by new study.
Six elements such as oxygen, carbon, hydrogen, nitrogen, phosphorus and sulphur
are considered essential for life. So the announcement in 2010 implied one of
biology's golden rules had been broken.One of the papers is authored by Tobias
Erb from the Swiss Federal Institute of Technology in Zurich and colleagues and
the other comes from a group led by Marshall Reaves of Princeton University in
New Jersey.
The new papers suggest instead
that though the organism is able to stay alive in high arsenic and low
phosphorus conditions, it still needs phosphorus to grow. The most recent
studies also found no proof that arsenic was included into the microbe's DNA -
as the authors of the original paper had recommended.The researchers argue
that the bacterium being highly adapted to the arsenic-rich environment of the lake
is thrifty, and has become skilled at scavenging phosphorus under harsh circumstances.
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