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Identification of Novel Butyrate- and Acetate-Oxidizing Bacteria in Butyrate-Fed Mesophilic Anaerobic Chemostats by DNA-Based Stable Isotope Probing

  • Environmental Microbiology
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Abstract

Butyrate is one of the most important intermediates during anaerobic digestion of protein wastewater, and its oxidization is considered as a rate-limiting step during methane production. However, information on syntrophic butyrate-oxidizing bacteria (SBOB) is limited due to the difficulty in isolation of pure cultures. In this study, two anaerobic chemostats fed with butyrate as the sole carbon source were operated at different dilution rates (0.01/day and 0.05/day). Butyrate- and acetate-oxidizing bacteria in both chemostats were investigated, combining DNA-Stable Isotope Probing (DNA-SIP) and 16S rRNA gene high-throughput sequencing. The results showed that, in addition to known SBOB, Syntrophomonas, other species of unclassified Syntrophomonadaceae were putative butyrate-oxidizing bacteria. Species of Mesotoga, Aminivibrio, Acetivibrio, Desulfovibrio, Petrimonas, Sedimentibacter, unclassified Anaerolineae, unclassified Synergistaceae, unclassified Spirochaetaceae, and unclassified bacteria may contribute to acetate oxidation from butyrate metabolism. Among them, the ability of butyrate oxidation was unclear for species of Sedimentibacter, unclassified Synergistaceae, unclassified Spirochaetaceae, and unclassified bacteria. These results suggested that more unknown species participated in the degradation of butyrate. However, the corresponding function and pathway for butyrate or acetate oxidization of these labeled species need to be further investigated.

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Funding

This study was funded by the Ministry of Science and Technology of China (No. 2016YFE0127700) and by the National Natural Science Foundation of China (No. 51678378; No. 31200068).

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  1. College of Architecture and Environment, Sichuan University, No. 24, South Section 1, First Ring Road, Chengdu, 610065, Sichuan, China

    Yue Yi, HuiZhong Wang, Min Gou, ZiYuan Xia & YueQin Tang

  2. Institute for Disaster Management and Reconstruction, Sichuan University-The Hong Kong Polytechnic University, No. 122 Huanghe Middle Road Section 1, Shuangliu District, Chengdu, 610027, Sichuan, China

    YaTing Chen

  3. College of Engineering, Peking University, No. 5 Yiheyuan Road, Haidian District, Beijing, 100871, China

    Bin Hu & Yong Nie

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Yi, Y., Wang, H., Chen, Y. et al. Identification of Novel Butyrate- and Acetate-Oxidizing Bacteria in Butyrate-Fed Mesophilic Anaerobic Chemostats by DNA-Based Stable Isotope Probing. Microb Ecol 79, 285–298 (2020). https://doi.org/10.1007/s00248-019-01400-z

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