Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Isolation and Characterization of a Paenibacillus incheonensis YK5 with Antimicrobial Activity aginst MRSA

항MRSA 활성을 보이는 Paenibacillus incheonensis YK5의 분리 및 특성

  • Published : 2008.12.31
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Abstract

Various bacteria were isolated from Korean soil samples based on their capability inhibiting the growth of MRSA strains. Among them, strain YK5 with the highest activity was a Gram positive sporulative bacillus with motility. It did not produce indole and no acid was formed from mannitol by the bacterium. The 16S rRNA sequence of the strain showed $95{\sim}98%$ homology with those of Paenibacillus spp.. The bacterial isolate shared the highest homology with that of P. elgii (98%), but was named as Paenibacillus incheonensis YK5 due to differences in physiological properties. Butanol extract of the P. incheonensis YK5 culture grown in SST medium at $37^{\circ}C$ for 96 hr showed a broad antimicrobial activity against Gram-positive (MRSA and Streptococcus pneumoniae) and negative (Pseudomonas aeruginosa, Salmonella spp., Shigella spp., Escherichia coli, Klebsiella pneumoniae) pathogenic bacteria and fungi (Cryptococcus neoformans and Trichophyton). The antimicrobial activity in the crude extract was stable in a broad range of temperature and pH, $20{\sim}100^{\circ}C$ and $3.0{\sim}6.0$, respectively. Therefore, the antimicrobial activity of P. incheonesis YK5 had potential as a novel antibiotics for pathogens including MRSA.

국내 토양으로부터 MRSA에 대해 항균활성을 보이는 세균들을 분리하였다. 이들 가운데 가장 높은 항MRSA 균 활성을 보인 YK5 균주는 호기성 간균으로 운동성이 있고, 내생포자를 형성하였으며, 인돌을 형성하지 않았고, mannitol을 분해하여 산을 생성시키지 않았다. 이 균주의 16S rRNA 유전자 염기서열은 Paenibacillus 속 세균들의 유전자와 $95{\sim}98%$의 상동성을 나타냈는데 특히 P. elgii와 가장 높은 상동성을 보였으나, 기타 생리 생화학적 특성에서 다른 점들이 관찰되어 P. incheonensis YK5로 명명되었다. P. incheonensis YK5 를 SST 배지에 접종하여 $37^{\circ}C$에서 96 시간 배양한 다음 그 상등액으로 부터 부탄올로 추출된 항균물질은 그람 양성균인 MRSA 20 균주들과 Streptococcus pneumoniae, 그람 음성균인 Pseudomonas aeruginosa 10균주들, Salmonella spp., Shigella spp., Escherichia coli와 Klebsiella pneumoniae 및 인체병원성 진균인 Cryptococcus neoformans와 Trichophyton spp.에 대하여 광범위한 항균효과를 나타냈다. 또한 이 항균물질은 $20{\sim}100^{\circ}C$ 사이의 온도구간에서 안정한 활성을 유지하였을 뿐만 아니라, pH $3.0{\sim}7.0$의 넓은 pH범위에서 활성을 나타내 MRSA를 비롯한 다양한 병원균에 대한 항생물질로서의 가능성을 보였다.

Keywords

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