Albibacter

Abstract

Al . bi . bac ' ter . L. adj. albus white; M.L. masc. n. bacter equivalent of Gr. neut. n. baktron a small rod; M.L. masc. n. Albibacter small, white rod. Proteobacteria / Alphaproteobacteria / Rhizobiales / Methylocystaceae / Albibacter Rods 0 . 9–1 . 0 × 1 . 2–1 . 8 μ m , singly, in pairs, or in clusters. Nonmotile . Gram negative. Multiplication is by binary fission. Endospores and prosthecae are not formed. Colonies are white. Obligately aerobic , having a strictly respiratory type of metabolism with oxygen as the terminal electron acceptor. Nitrate is reduced to nitrite. Growth occurs on nutrient agar and peptone–yeast extract–glucose (PYG) agar. Facultatively methylotrophic and chemolithotrophic . Assimilate C 1 compounds via the ribulose bisphosphate pathway . Able to grow on a wide spectrum of polycarbon substrates. Sugars are utilized aerobically but not fermented. Ammonium salts, nitrate, urea, peptone, some amino acids, and methylated amines are utilized as nitrogen sources. Growth factors are not required. Methyl red and Voges–Proskauer negative. Catalase and urease positive. Oxidase activity is very low . Indole is formed from L ‐tryptophan in the mineral medium with methanol as a sole carbon and energy source and with KNO 3 as the nitrogen source. The major ubiquinone is Q‐10. The predominant cellular fatty acids are cis ‐vaccenic (C 18:1 ω7 ) and palmitic (C 16:0 ). The dominant phospholipids are phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, and phosphoserine. Belongs to the Alphaproteobacteria . The mol % G + C of the DNA is : 66.7. Type species : Albibacter methylovorans Doronina, Trotsenko, Tourova, Kuznetsov and Leisinger 2001, 1056.