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Weird, ultra-small microbes turn up in acidic mine drainage
Date:5/4/2010

a lot of genes with Euryarchaeota and Crenarchaeaota, but they also have a lot of genes not seen before in these branches of Archaea," he said, suggesting that ARMAN may have been around since these two branches split billions of years ago.

Three-dimensional cryoEM tomographic reconstructions show the unique architecture of ARMAN, Comolli said. It has very few ribosomes the machines that build proteins per unit volume, for example; in the same volume, E coli would have 100 times more. The ribosomes also are distributed close to the cell wall. ARMAN cells also have an enigmatic internal tube. Like other Archaea, however, they have no nucleus or other internal organelles.

Banfield's group first described the ARMAN microbes four years ago, after identifying the organisms in acidic pools in the Richmond Mine, which is owned by Ted Arman, in Iron Mountain, Calif. The team's continued analysis has revealed amazing organization within the mine drainage biofilm communities that grow on solutions with the acidity of battery acid. The new data will help the researchers explore even further the community of organisms in the mine and determine how the organisms are able to live in such harsh environs and convert iron sulfides to sulfuric acid.

"Having these microbes described at the genomic level allows us to develop molecular identification methods and combine these methods with a 3-D view of the microbes to study the distribution of these organisms within this little ecological system, this little society, in the mine," Comolli said.


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Contact: Robert Sanders
rsanders@berkeley.edu
510-643-6998
University of California - Berkeley
Source:Eurekalert  

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