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- Descr!ption of Ornithinimicrobium cryptoxanthini sp. nov., a Novel Actinomycete Producing β‑cryptoxanthin Isolated from the Tongtian River Sediments
- Yuyuan Huang , Yifan Jiao , Sihui Zhang , Yuanmeihui Tao , Suping Zhang , Dong Jin , Ji Pu , Liyun Liu , Jing Yang , Shan Lu
- J. Microbiol. 2023;61(4):379-388. Published online March 16, 2023
- DOI: https://doi.org/10.1007/s12275-023-00029-5
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Abstract
- Two novel Gram-stain-positive, aerobic, non-motile, and yellow-pigmented, irregular rod-shaped bacteria (JY.X269 and JY.X270T) were isolated from the near-surface sediments of river in Qinghai Province, P. R. China (32°37′13″N, 96°05′37″E) in July 2019. Both strains were shown to grow at 15–35 °C and pH 7.0–10.0, and in the presence of 0–6.0% (w/v) NaCl. The 16S rRNA gene sequence analysis showed that the isolates were closely related to Ornithinimicrobium cavernae CFH 30183 T (98.6–98.8% 16S rRNA gene sequence similarity), O. ciconiae H23M54T (98.5–98.6%) and O. murale 01-Gi-040T (98.3–98.5%). The phylogenetic and phylogenomic trees based on the 16S rRNA gene and 537 core gene sequences, respectively, revealed that the two strains formed a distinct cluster with the above three species. The digital DNA-DNA hybridization (dDDH) and average nucleotide identity (ANI) values between our two isolates (JY.X269 and JY.X270T) and other Ornithinimicrobium species were within the ranges of 19.0–23.9% and 70.8–80.4%, respectively, all below the respective recommended 70.0% and 95–96% cutoff point. Furthermore, the major cellular fatty acids (> 10.0%) of strains JY.X269 and JY.X270T were iso-C15:0, iso-C16:0, and summed feature 9. Strain JY.X270T contained MK-8(H4) and ornithine as the predominant menaquinone and diagnostic diamino acid component within the cell wall teichoic acids. β-cryptoxanthin ( C40H56O) can be extracted from strain JY.X270T, and its content is 6.3 μg/ml. Based on results from the phylogenetic, chemotaxonomic, and phenotypic analyses, the two strains could be classified as a novel species of the genus Ornithinimicrobium, for which the name Ornithinimicrobium cryptoxanthini sp. nov. is proposed (type strain JY.X270T = CGMCC 1.19147T = JCM 34882T).
Research Support, Non-U.S. Gov't
- Involvement of Alternative Oxidase in the Regulation of Growth, Development, and Resistance to Oxidative Stress of Sclerotinia sclerotiorum
- Ting Xu , Fei Yao , Wu-Sheng Liang , Yong-Hong Li , Dian-Rong Li , Hao Wang , Zheng-Yi Wang
- J. Microbiol. 2012;50(4):594-602. Published online August 25, 2012
- DOI: https://doi.org/10.1007/s12275-012-2015-7
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Abstract
- Sclerotinia sclerotiorum is a cosmopolitan, filamentous, fungal pathogen that can cause serious disease in many kinds of crops. Alternative oxidase is the terminal oxidase of the alternative mitochondrial respiratory pathway in fungi and higher plants. We report the presence of this alternative pathway respiration and demonstrate its expression in two isolates of S. sclerotiorum under unstressed, normal culture conditions. Application of salicylhydroxamic acid, a specific inhibitor of alternative oxidase, severely inhibited the mycelial growth of S. sclerotiorum both on potato dextrose agar plates and in liquid culture media. Inhibition of alternative oxidase could influence the growth pattern of S. sclerotiorum, as salicylhydroxamic acid treatment induced obvious aerial mycelia growing on potato dextrose agar plates. Under the treatment with salicylhydroxamic acid, S. sclerotiorum formed sclerotia much more slowly than the control. Treatment with hydrogen peroxide in millimolar concentrations greatly decreased the growth rate of mycelia and delayed the formation of sclerotia in both tested S. sclerotiorum isolates. As well, this treatment obviously increased their alternative pathway respiration and the levels of both mRNA and protein of the alternative oxidase. These results indicate that alternative oxidase is involved in the regulation of growth, development, and resistance to oxidative stress of S. sclerotiorum.
- Respiratory Chain-Linked Components of the Marine Bacterium Vibrio alginolyticus Affect Each Other
- Young Jae Kim
- J. Microbiol. 2002;40(2):125-128.
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Abstract
- The aerobic respiratory chain of Vibrio alginolyticus possesses two different kinds of NADH oxidase systems, i.e., an Na^+ -dependent NADH oxidase system and an Na^+ -independent NADH oxidase system. When deamino-NADH, which is the only substrate for the Na^+ -dependent NADH oxidase system, was used as a substrate, the maximum activities of Na^+ -dependent NADH:quinone oxidoreductase and Na^+ -dependent NADH oxidase were obtained at about 0.06 M and 0.2 M NaCl, respectively. When NADH, which is a substrate for both Na^+ -dependent and Na^+ -independent NADH oxidase systems was used as a substrate, the NADH oxidase activity had a pH optimum at about 8.0. In contrast, when deamino-NADH was used as a substrate, the NADH oxidase activity had a pH optimum at about 9.0. On the other hand, inside-out membrane vesicles prepared from the wild-type bacterium generated only a very small [delta]pH by the NADH oxidase system, whereas inside-out membrane vesicles prepared from Nap1, which is a mutant defective in the Na^+ pump, generated [delta]pH to a considerable extent by the NADH oxidase system. On the basis of the results, it was concluded that the respiratory chain-linked components of V. alginolyticus affect each other.
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