Actinobacillus succinogenes sp. nov., a novel succinic-acid-producing strain from the bovine rumen

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Abstract
Strain 130ZTwas isolated from the bovine rumen. It is a facultatively anaerobic, pleomorphic, Gram-negative rod. It exhibits a ‘Morse code’ form of morphology, which is characteristic of the genus Actinobacillus. Strain 130ZTis a capnophilic, osmotolerant succinogen that utilizes a broad range of sugars. It accumulates high concentrations of succinic acid (> 70gl-1). Strain 130ZTis positive for catalase, oxidase, alkaline phosphatase and β-galactosidase, but does not produce indole or urease. Acid but no gas is produced from d-glucose and d-fructose. 16S rRNA sequence analysis places strain 130ZTwithin the family Pasteurellaceae; the most closely related members of the family Pasteurellaceae have 16S rRNA similarities of 95.5% or less with strain 130ZT. Strain 130ZTwas compared with Actinobacillus lignieresii and the related Bisgaard Taxa 6 and 10. Based upon morphological and biochemical properties, strain 130ZTis most similar to members of the genus Actinobacillus within the family Pasteurellaceae. It is proposed that strain 130ZTbe classified as a new species, Actinobacillus succinogenes. The type strain of Actinobacillus succinogenes sp. nov. is ATCC 55618T.

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