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강연경 ( Yeongyeong Kang ),( Denver Walitang ),( Poulami Chatterjee ),표채은 ( Chaeeun Pyo ),사동민 ( Tongmin Sa ) 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
Methane (CH4) is currently receiving great attention due to its severe impact on the environment as a greenhouse gas. The atmospheric concentration of methane is continuously increasing and its average concentration is around 1.87 mg L<sup>-1</sup>. Methane is produced in nature when methanogens digest plant material in the absence of oxygen. Methane emission from rice fields is one of the largest individual sources in the global budget of atmospheric CH<sub>4</sub>. Methane-oxidizing bacteria (MOB) are phylogenetically diverse groups defined by their ability to use methane as a major carbon and energy source. Aerobic MOB, which are widely present in natural environments, can utilize methane as the sole carbon and energy source through a unique enzyme system of methane monooxygenase (MMO). MMO has a soluble cytoplasmic form (sMMO) and a particulate membrane associated form (pMMO). The objective of this study is to investigate the presence of sMMO in Methylobacterium spp. The selected strains for the current study, Methylobacterium spp. were isolated from rice. MOB are a subset of a physiological group of bacteria known as methylotrophs. The sMMO consists of three components, proteins A, B, and C. Protein A is coded for by the mmoX, mmoY, and mmoZ genes. Protein B is coded for by the mmoB gene. Protein C is the reductase component of the enzyme and is coded for by the mmoC gene. The presence of sMMO in Methylobacterium spp. was proven through polymerase chain reaction (PCR) using mmoC specific primer. This results indicate that there were 18 out of 19 strains of Methylobacterium. spp with sMMO detected through PCR-based amplification of an mmoC gene. PCR products of the correct size (314 bp) were obtained with all of the Methylobacterium spp. used in this study. In the current study confirming the oxidative activity of the strains that contain the sMMO. Future study the growth of these isolates using methane as the sole carbon source and then assess methane oxidation potential of by gas chromatography and their contribution in atmospheric methane oxidation.