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Microbiology 152 (2006), 2159-2169; DOI  10.1099/mic.0.28699-0
© 2006 Society for General Microbiology

Occurrence, phylogeny and evolution of ribulose-1,5-bisphosphate carboxylase/oxygenase genes in obligately chemolithoautotrophic sulfur-oxidizing bacteria of the genera Thiomicrospira and Thioalkalimicrobium

Tatjana P. Tourova1, Elizaveta M. Spiridonova2, Ivan A. Berg2, Boris B. Kuznetsov3 and Dimitry Yu. Sorokin1,4

1 Institute of Microbiology, Russian Academy of Sciences, p-t 60-letiya Oktyabrya, 7/2, Moscow, Russia
2 Department of Microbiology, Moscow State University, Moscow, Russia
3 Centre Bioengineering, Russian Academy of Sciences, Moscow, Russia
4 Department of Biotechnology, Delft University of Technology, Delft, The Netherlands

Correspondence
Tatjana P. Tourova
ttour{at}biengi.ac.ru

The occurrence of the different genes encoding ribulose-1,5-bisphosphate carboxylase/oxygenase (RubisCO), the key enzyme of the Calvin–Benson–Bassham cycle of autotrophic CO2 fixation, was investigated in the members of the genus Thiomicrospira and the relative genus Thioalkalimicrobium, all obligately chemolithoautotrophic sulfur-oxidizing Gammaproteobacteria. The cbbL gene encoding the ‘green-like’ form I RubisCO large subunit was found in all analysed species, while the cbbM gene encoding form II RubisCO was present only in Thiomicrospira species. Furthermore, species belonging to the Thiomicrospira crunogena 16S rRNA-based phylogenetic cluster also possessed two genes of green-like form I RubisCO, cbbL-1 and cbbL-2. Both 16S-rRNA- and cbbL-based phylogenies of the Thiomicrospira–Thioalkalimicrobium–Hydrogenovibrio group were congruent, thus supporting its monophyletic origin. On the other hand, it also supports the necessity for taxonomy reorganization of this group into a new family with four genera.

Abbreviations: RSCU, relative synonymous codon usage; RubisCO, ribulose-1,5-bisphosphate carboxylase/oxygenase; SOB, sulfur-oxidizing bacteria

The GenBank/EMBL/DDBJ accession numbers for the sequences reported in this paper are DQ272527-DQ272537.




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