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• W2394602302 abstract "이 연구의 목적은 코리네형 균주(Corynebacterium glutamicum)에 존재하는 acyltransferase 유전인자의 발현에 관여하는 autoinducer에 대한 정보를 얻기 위해 다양한 종류의 균주에서 얻은 세포배양액(cell-free culture fluids)을 처리하여 발현에 미치는 효과를 조사하는 것이다. 다양한 배양시간동안 얻은 Agrobacterium tumefaciens의 세포배양액은 acyltransferase의 발현을 전혀 증가시키지 못하는 것으로 관찰되었다. 반면 AI-1과 AI-2를 분비하는 것으로 알려진 Vibrio harveyi BB120(<TEX>$AI-1^+$</TEX>, <TEX>$AI-2^+$</TEX>)을 지수성장기까지 배양시켜 얻은 세포배양액은 acyltransferase의 발현을 증가시키는 것으로 관찰되었다. 이들 autoinducer가 미치는 효과를 조사하기 위하여 돌연변이 균주인 MM77 (<TEX>$AI-1^-$</TEX>, <TEX>$AI-2^-$</TEX>)과 BB152 (<TEX>$AI-1^-$</TEX>, <TEX>$AI-2^+$</TEX>)를 사용하여 조사한 결과, 이들 균주에서 얻은 세포배양액은 BB120와는 달리 acyltransferase의 발현을 증가시키지 않는 것으로 나타났다. 이러한 결과로 보아 acyltransferase의 발현은 AI-1에 의한 효과로 보이며, 이를 확인하기 위해 V. harveyi BB152와 같이 AI-2만을 분비하는 것으로 알려진 Escherichia coli (<TEX>$AI-1^-$</TEX>, <TEX>$AI-2^+$</TEX>)를 사용하였다. 하지만 E. coli 세포배양액은 acyltransferase의 발현을 증가시키는 것으로 관찰되었다. 이들 결과는 코리네형 균주에 존재하는 autoinducer는 기존에 알려진 형태의 신호분자와 차이가 있을 것이며, 코리네형 균주외에 V. harveyi와 E. coli에도 존재하여 종간 상호작용(interspecies communication)에 관여할 것으로 보인다. Autoinduction is mediated by signaling molecules known as autoinducers (AIs) that are produced, released and detected by bacterium itself. We recently reported that Corynebacterium glutamicum possesses an autoinduction system which secretes autoinducers during the stationary-phase of growth, triggering the expression of acyltransferase gene. However, it is still not clear what may act as autoinducers for the autoinduction in C. glutamicum. In this study, we compared the inducing effects of cell-free culture fluids obtained from a number of microbes including Agrobacterium tumefaciens, Vibrio harveyi, and Escherichia coli. Fluids from A. tumefaciens did not increase the expression of acyltransferase, whereas fluids from V. harveyi BB120 (<TEX>$AI-1^+$</TEX>, <TEX>$AI-2^+$</TEX>) did. Interestingly, the expression was increased by the fluids obtained from the early exponential-phase culture of BB120. Furthermore, this induction was not observed by the fluids from autoinducer mutants of V. harveyi MM77 (<TEX>$AI-1^-$</TEX>, <TEX>$AI-2^-$</TEX>) and BB152 (<TEX>$AI-1^-$</TEX>, <TEX>$AI-2^+$</TEX>). Unlike the effect shown by BB152, fluids from E. coli (<TEX>$AI-1^-$</TEX>, <TEX>$AI-2^+$</TEX>) still induced the acyltransferase expression. Taken together, these results suggest that C. glutamicum autoinducers seem to be unidentified molecules which do not belong to AI-1 or AI-2." @default.
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• W2394602302 title "Effects of Cell-free Culture Fluids for the Expression of Putative Acyltransferase in Corynebacterium glutamicum" @default.
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