''Aquicella'' is a genus of

Gram-negative Gram-negative bacteria are bacteria that do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. They are characterized by their cell envelopes, which are composed of a thin peptidoglycan cell wa ...

rod-shaped cells and filaments in the family ''

Coxiellaceae The Coxiellaceae are a family in the order Legionellales. ''Coxiella burnetii'' is a species in this order. Another is ''Rickettsiella melolonthae''. References Legionellales Bacteria families {{Legionellales-stub ...

'' from the order ''

Legionellales The Legionellales are an order of Pseudomonadota. Like all Pseudomonadota, they are Gram-negative.George M. Garrity: ''Bergey's Manual of Systematic Bacteriology''. 2. Auflage. Springer, New York, 2005, Volume 2: ''The Proteobacteria, Part B: The ...

''. The type species of this genus is ''Aquicella lusitana.'' The name ''Aquicella'' is composed of the Latin term ''aqua'' (referring to water) and the Latin term ''cella'' (referring to a chamber, closet, or cabinet, or in biology, a cell). Together, the name ''Aquicella'' translates to a cell from water.

Biochemical Characteristics and Molecular Signatures

Members of this genus grow in protozoa and can be isolated from hydrothermal areas. All members are strictly

aerobic Aerobic means "requiring air," in which "air" usually means oxygen. Aerobic may also refer to * Aerobic exercise, prolonged exercise of moderate intensity * Aerobics, a form of aerobic exercise * Aerobic respiration, the aerobic process of cel ...

, non-motile, do not produce spores and are oxidase and catalase negative. ''Aquicella'' species can grow in temperatures ranging from 30 °C to 43 °C and require a neutral pH and growth media containing activated charcoal and a-ketoglutarate. Colonies appear whitish with a pink or blue sheen. Analyses of genome sequences from ''Aquicella'' species identified six

conserved signature indels Conserved signature inserts and deletions (CSIs) in protein sequences provide an important category of molecular markers for understanding phylogenetic relationships. CSIs, brought about by rare genetic changes, provide useful phylogenetic markers ...

(CSIs) as exclusively present in members of this genus in the proteins 30S ribosomal protein S6-L-glutamate ligase, crossover junction endodeoxyribonuclease RuvC, Tim44 domain-containing protein, pyruvate dehydrogenase (acetyl-transferring), homodimeric type, c-type cytochrome and response regulator transcription factor. These CSIs serve to molecularly demarcate this genus from other ''Coxiellaceae'' species and all other bacteria.

References

{{Taxonbar, from=Q21220451 Bacteria genera Legionellales