Aerotaxis in Halobacterium salinarium is methylation-dependent

Article Abstract:

The movement of the archaeon bacteria Halobacterium salinarium away from low O2 concentration areas is controlled by the methylation of methyl accepting proteins. Aerotactic responses are absent in the absence of methyl donors and in methyltransferase-deficient mutants. The aerotactic response consists of smooth swimming and a brief tumbling stage. The response is greatest at the time of high respiration such as the exponential growth phase. Methanol is released in response to both increases or decreases in O2 concentration.

Physiological aspects, Methylation, Archaea

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Isolation and characterization of a novel single-stranded RNA virus infectious to a marine fungoid protist, Schizochytrium sp. (Thraustochytriaceae, Labyrinthulea)

Article Abstract:

The isolation and characterization of a novel single-stranded RNA (saran) virus infecting the marine fungous protist Schizochytrium sp. (Labyrinthulea, Thraustochytriaceae) are examined. It indicates that viral infection is one of the significant factors controlling the dynamics of thraustochytrids and provides new insights into understanding the ecology of these organisms.

Genetic aspects, Genetic research, Marine fauna, Marine animals, RNA virus infections

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A deeply branched novel phylotype found in Japanese paddy soils

Article Abstract:

Researchers describe a bacterium in rice paddies that is related to the Archaea and Eukarya but different enough to constitute a new group. Their phylogenetic position places them far from the Crenarchaeota and Euryarchaeota.

Archaebacteria

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