1887

Abstract

A marine, magnetotactic bacterium, designated strain MMS-1, was isolated from mud and water from a salt marsh in Woods Hole, Massachusetts, USA, after enrichment in defined oxygen-concentration/redox-gradient medium. Strain MMS-1 is an obligate microaerophile capable of chemoorganoheterotrophic and chemolithoautotrophic growth. Optimal growth occurred at pH 7.0 and 24–26 °C. Chemolithoautotrophic growth occurred with thiosulfate as the electron donor and autotrophic carbon fixation was via the Calvin–Benson–Bassham cycle. The G+C content of the DNA of strain MMS-1 was 47.2 mol%. Cells were Gram-negative and morphologically variable, with shapes that ranged from that of a lima bean to fully helical. Cells were motile by means of a single flagellum at each end of the cell (amphitrichous). Regardless of whether grown in liquid or semi-solid cultures, strain MMS-1 displayed only polar magnetotaxis and possessed a single chain of magnetosomes containing elongated octahedral crystals of magnetite, positioned along the long axis of the cell. Phylogenetic analysis based on 16S rRNA gene sequences indicated that strain MMS-1 belongs to the family within the , and is distantly related to species of the genus . Strain MMS-1 is therefore considered to represent a novel species of a new genus, for which the name gen. nov., sp. nov. is proposed. The type strain of is MMS-1 ( = ATCC BAA-1438 = JCM 17960).

Funding
This study was supported by the:
  • US National Science Foundation (Award EAR-0920718)
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2012-10-01
2021-10-15
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