Symbiobacterium lost carbonic anhydrase in the course of evolution.

Journal of Molecular Evolution
Hiromi NishidaKenji Ueda

Abstract

Recent genetic studies have elucidated that carbonic anhydrase (CA; EC 4.2.1.1), a ubiquitous enzyme catalyzing interconversion between CO(2) and bicarbonate, is essential for microbial growth under ambient air but not under high-CO(2) air. The irregular distribution of the phylogenetically distinct types of CA in the prokaryotic genome suggests its complex evolutionary history in prokaryotes. This paper deals with the genetic defect of CA in Symbiobacterium thermophilum, a syntrophic bacterium that effectively grows on CO(2) generated by other bacteria. Phylogenetic analysis based on 31 ribosomal protein sequences demonstrated the affiliation of Symbiobacterium with the class Clostridia with 100% bootstrap support. The phylogeny of beta- and gamma-type CA distributed among Clostridia supported the view that S. thermophilum and several related organisms lost this enzyme during the course of evolution. The loss of CA could be based on the availability of a high level of CO(2) in their living environments.

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Citations

Mar 20, 2009·Current Genetics·Skander Elleuche, Stefanie Pöggeler
Jun 8, 2012·International Journal of Evolutionary Biology·Kenji UedaTeruhiko Beppu
Feb 26, 2011·International Journal of Evolutionary Biology·Hiromi Nishida, Choong-Soo Yun
Feb 26, 2011·International Journal of Evolutionary Biology·Kenro OshimaHiromi Nishida
Apr 12, 2014·Molecular Microbiology·Ronny LehneckStefanie Pöggeler
Oct 17, 2009·Microbiology·Skander Elleuche, Stefanie Pöggeler

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