Isolation, Genomic Sequence and Physiological Characterization of Parageobacillus sp. G301, an Isolate Capable of Both Hydrogenogenic and Aerobic Carbon Monoxide Oxidation

被引:4
作者
Imaura, Yoshinari [1 ]
Okamoto, Shunsuke [1 ]
Hino, Taiki [1 ]
Ogami, Yusuke [1 ]
Katayama, Yuka Adachi [1 ]
Tanimura, Ayumi [1 ]
Inoue, Masao [1 ,2 ,3 ]
Kamikawa, Ryoma [1 ]
Yoshida, Takashi [1 ]
Sako, Yoshihiko [1 ]
机构
[1] Kyoto Univ, Grad Sch Agr, Kyoto, Japan
[2] Ritsumeikan Univ, R GIRO, Kusatsu, Shiga, Japan
[3] Ritsumeikan Univ, Coll Life Sci, Kusatsu, Shiga, Japan
关键词
carbon monoxide dehydrogenase; carbon monoxide metabolism; Parageobacillus; CARBOXYDOTROPHIC BACTERIUM; RHODOSPIRILLUM-RUBRUM; CO DEHYDROGENASE; GEN; NOV; ALIGNMENT; DIVERSITY; EMISSIONS; PROTEIN; CARBOXYDOVORANS; PURIFICATION;
D O I
10.1128/aem.00185-23
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
Microbial CO oxidation has received much attention because it contributes to global carbon cycling in addition to functioning as a remover of CO, which is toxic to many organisms. Some microbial CO oxidizers, including both bacteria and archaea, exhibit sister relationships with non-CO oxidizers even in genus-level monophyletic groups. Prokaryotes that can oxidize carbon monoxide (CO oxidizers) can use this gas as a source of carbon or energy. They oxidize carbon monoxide with carbon monoxide dehydrogenases (CODHs): these are divided into nickel-containing CODH (Ni-CODH), which are sensitive to O-2, and molybdenum-containing CODH (Mo-CODH), which can function aerobically. The oxygen conditions required for CO oxidizers to oxidize CO may be limited, as those which have been isolated and characterized so far contain either Ni- or Mo-CODH. Here, we report a novel CO oxidizer, Parageobacillus sp. G301, which is capable of CO oxidation using both types of CODH based on genomic and physiological characterization. This thermophilic, facultatively anaerobic Bacillota bacterium was isolated from the sediments of a freshwater lake. Genomic analyses revealed that strain G301 possessed both Ni-CODH and Mo-CODH. Genome-based reconstruction of its respiratory machinery and physiological investigations indicated that CO oxidation by Ni-CODH was coupled with H-2 production (proton reduction), whereas CO oxidation by Mo-CODH was coupled with O-2 reduction under aerobic conditions and nitrate reduction under anaerobic conditions. G301 would thus be able to thrive via CO oxidation under a wide range of conditions, from aerobic environments to anaerobic environments, even with no terminal electron acceptors other than protons. Comparative genome analyses revealed no significant differences in genome structures and encoded cellular functions, except for CO oxidation between CO oxidizers and non-CO oxidizers in the genus Parageobacillus; CO oxidation genes are retained exclusively for CO metabolism and related respiration.IMPORTANCE Microbial CO oxidation has received much attention because it contributes to global carbon cycling in addition to functioning as a remover of CO, which is toxic to many organisms. Some microbial CO oxidizers, including both bacteria and archaea, exhibit sister relationships with non-CO oxidizers even in genus-level monophyletic groups. In this study, we demonstrated that a new isolate, Parageobacillus sp. G301, is capable of both anaerobic (hydrogenogenic) and aerobic CO oxidation, which has not been previously reported. The discovery of this new isolate, which is versatile in CO metabolism, will accelerate research on CO oxidizers with diverse CO metabolisms, expanding our understanding of microbial diversity. Through comparative genomic analyses, we propose that CO oxidation genes are not essential genetic elements in the genus Parageobacillus, providing insights into the factors which shape the punctate distribution of CO oxidizers in the prokaryote tree, even in genus-level monophyletic groups.
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页数:14
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