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ParacoccusRANK: GenusTAXONOMY: cellular organisms -> Bacteria -> Proteobacteria -> Alphaproteobacteria -> Rhodobacterales -> Rhodobacteraceae -> Paracoccus OVERVIEW: Spherical cells 0.5–0.9 µm in diameter or very short rod-shaped cells 1.1–1.3 µm in diameter. Occur singly, in pairs, or in small clusters. Usually not encapsulated. Gram negative. Nonspore-forming and nonmotile. Aerobic with a strictly respiratory metabolism. N-oxides such as nitrate, nitrite, and nitrous oxide can be used as terminal electron acceptors for respiration under anaerobic conditions. Nitrate is reduced to N2 via nitrite, nitric oxide, and nitrous oxide (denitrification). Oxidase and catalase positive. Chemoorganotrophic growth occurs with a wide variety of organic compounds as carbon source. Chemolithoautotrophic growth occurs with CO2 as carbon source, and H2, methanol, methylamine, or thiosulfate as the electron-donating free-energy source. Occur in water, soil, sewage, and sludge.The mol% G + C of the DNA is: 64–67.Type species: Paracoccus denitrificans This genus contains microbial species that can reside in the human gastrointestinal tract. [PMC 4262072]
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