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Int J Syst Evol Microbiol 57 (2007), 1318-1322; DOI  10.1099/ijs.0.64857-0
© 2007 International Union of Microbiological Societies

‘Candidatus Magnetoglobus multicellularis’, a multicellular, magnetotactic prokaryote from a hypersaline environment

Fernanda Abreu1, Juliana Lopes Martins1, Thaís Souza Silveira1, Carolina Neumann Keim1, Henrique G. P. Lins de Barros2, Frederico J. Gueiros Filho3 and Ulysses Lins1

1 Instituto de Microbiologia Professor Paulo de Góes, Universidade Federal do Rio de Janeiro, 21941-590 Rio de Janeiro, RJ, Brazil
2 Centro Brasileiro de Pesquisas Físicas, Rua Xavier Sigaud 150, Urca, 22290-180 Rio de Janeiro, RJ, Brazil
3 Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, 05508-900 São Paulo, SP, Brazil

Correspondence
Ulysses Lins
ulins{at}micro.ufrj.br

Phylogenetic analysis and phenotypic characterization were used to assign a multicellular magnetotactic prokaryote the name ‘Candidatus Magnetoglobus multicellularis’. ‘Candidatus Magnetoglobus multicellularis' lives in a large hypersaline coastal lagoon from Brazil and has properties that are unique among prokaryotes. It consists of a compact assembly or aggregate of flagellated bacterial cells, highly organized in a sphere, that swim in either helical or straight trajectories. The life cycle of ‘Candidatus Magnetoglobus multicellularis' is completely multicellular, in which one aggregate grows by enlarging the size of its cells and approximately doubling the volume of the whole organism. Cells then divide synchronously, maintaining the spherical arrangement; finally the cells separate into two identical aggregates. Phylogenetic 16S rRNA gene sequence analysis showed that ‘Candidatus Magnetoglobus multicellularis' is related to the dissimilatory sulfate-reducing bacteria within the Deltaproteobacteria and to other previously described, but not yet well characterized, multicellular magnetotactic prokaryotes.

Abbreviations: FISH, fluorescent in situ hybridization; MMO, magnetotactic multicellular organism; MMP, many-celled magnetotactic prokaryote

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence obtained from ‘Candidatus Magnetoglobus multicellularis' in this study is EF014726.

FISH results, fluorescence micrographs and flow cytometry results are available as supplementary material with the online version of this paper.






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