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The chimeric nature of the genomes of marine magnetotactic coccoid‐ovoid bacteria defines a novel group of P roteobacteria
Author(s) -
Ji Boyang,
Zhang ShengDa,
Zhang WeiJia,
Rouy Zoe,
Alberto François,
Santini ClaireLise,
Mangenot Sophie,
Gagnot Séverine,
Philippe Nadège,
Pradel Nathalie,
Zhang Lichen,
Tempel Sébastien,
Li Ying,
Médigue Claudine,
Henrissat Bernard,
Coutinho Pedro M.,
Barbe Valérie,
Talla Emmanuel,
Wu LongFei
Publication year - 2017
Publication title -
environmental microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.954
H-Index - 188
eISSN - 1462-2920
pISSN - 1462-2912
DOI - 10.1111/1462-2920.13637
Subject(s) - biology , magnetosome , deltaproteobacteria , alphaproteobacteria , betaproteobacteria , gammaproteobacteria , phylum , proteobacteria , genome , actinobacteria , genetics , bacteria , microbiology and biotechnology , evolutionary biology , gene , 16s ribosomal rna
Summary Magnetotactic bacteria (MTB) are a group of phylogenetically and physiologically diverse Gram‐negative bacteria that synthesize intracellular magnetic crystals named magnetosomes. MTB are affiliated with three classes of Proteobacteria phylum, Nitrospirae phylum, Omnitrophica phylum and probably with the candidate phylum Latescibacteria. The evolutionary origin and physiological diversity of MTB compared with other bacterial taxonomic groups remain to be illustrated. Here, we analysed the genome of the marine magneto‐ovoid strain MO‐1 and found that it is closely related to Magnetococcus marinus MC‐1. Detailed analyses of the ribosomal proteins and whole proteomes of 390 genomes reveal that, among the Proteobacteria analysed, only MO‐1 and MC‐1 have coding sequences (CDSs) with a similarly high proportion of origins from Alphaproteobacteria , Betaproteobacteria , Deltaproteobacteria and Gammaproteobacteria . Interestingly, a comparative metabolic network analysis with anoxic network enzymes from sequenced MTB and non‐MTB successfully allows the eventual prediction of an organism with a metabolic profile compatible for magnetosome production. Altogether, our genomic analysis reveals multiple origins of MO‐1 and M. marinus MC‐1 genomes and suggests a metabolism‐restriction model for explaining whether a bacterium could become an MTB upon acquisition of magnetosome encoding genes.