Journal of Microbiology

Hee Gon Kim

2 Articles

Isolation and Taxonomic Characterization of a Novel Type I Methanotrophic Bacterium: Hee Gon Kim , Gui Hwan Han , Chi-Yong Eom , Si Wouk Kim; J. Microbiol. 2008;46(1):45-50.; DOI: https://doi.org/10.1007/s12275-008-0017-2

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A methane-oxidizing bacterium was isolated from the effluent of manure and its molecular and biochemical properties were characterized. The isolate was aerobic, Gram-negative, and non-motile. The organism had a type I intracytoplasmic membrane structure and granular inclusion bodies. The outer cell wall surface (S-layers) was tightly packed with cup-shaped structures. Colonies were light yellow on nitrate mineral salt agar medium. In addition, the organism was catalase and oxidase positive. The isolate used the ribulose monophosphate (RuMP) pathway for carbon assimilation, and was able to utilize methane and methanol as a sole carbon and energy source, however, it could not utilize any other organic compounds that were tested. The cells grew well in a mixture of methane and air (methane:air=1:1, v/v) in a compulsory circulation diffusion system, and when grown under those conditions, the optimum pH was approximately 7.0 and the optimal temperature was 30°C. In addition, the specific growth rate and generation time were 0.13 per h and 5.43 h, respectively, when grown under the optimum conditions. The major ubiquinone was Q-8, and the G+C mol% of the DNA was 55.3. Phylogenetic analyses based on the 16S rRNA gene sequence comparisons showed that this bacterium belongs to a group of type I methanotrophs, and that it is most closely related to Methylomicrobium, with a sequence similarity of 99%. Therefore, the isolate was named Methylomicrobium sp. HG-1.

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Critical Reviews in Environmental Science and Technology.2015; 45(15): 1579. CrossRef
Optimization of lab scale methanol production by Methylosinus trichosporium OB3b
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Characterization of Methylophaga sp. strain SK1 Cytochrome cL Expressed in Escherichia coli: Hee Gon Kim , Trong Nhat Phan , Tae Sa Jang , Moonjoo Koh , Si Wouk Kim; J. Microbiol. 2005;43(6):499-502.; DOI: https://doi.org/2299 [pii]

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Abstract PDF: Methylophaga sp. strain SK1 is a new restricted facultative methanol-oxidizing bacterium that was isolated from seawater. The aim of this study was to characterize the electron carriers involved in the methanol oxidation process in Methylophaga sp. strain SK1. The gene encoding cytochrome cL (mxaG) was cloned and the recombinant gene was expressed in Escherichia coli DH5 under strict anaerobic conditions. The recombinant cytochrome cL had the same molecular weight and absorption spectra as the wild-type cytochrome cL both in the reduced and oxidized forms. The electron flow rate from methanol dehydrogenase (MDH) to the recombinant cytochrome cL was similar to that from MDH to the wild-type cytochrome cL. These results suggest that recombinant cytochrome cL acts as a physiological primary electron acceptor for MDH.

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