Observation of 2,3-butanediol biosynthesis in Lys regulator mutated Klebsiella pneumoniae at gene transcription level
- Observation of 2,3-butanediol biosynthesis in Lys regulator mutated Klebsiella pneumoniae at gene transcription level
- Lee, Soojin; Borim Kim; Daun Jeong; Minkyu Oh; 엄영순; Young-Rok Kim; Jungwook Kim; Jinwon Lee
- butanediol; klebsiella; Putative LysR-family transcriptional regulator; budR; Klebsiella pneumoniae; 2,3-Butanediol; Real-time PCR
- Issue Date
- Journal of biotechnology
- VOL 168, NO 4, 520-526
- Microorganisms that produce 2,3-butanediol (2,3-BDO) are mostly mixed acid fermentation microorganisms, and they synthesize 2,3-BDO in order to suppress medium acidification. The 2,3-BDO operon (budBAC) is activated by the LysR regulator protein derived from the budR. In this study, the effect of the budR on 2,3-BDO-biosynthesis was observed at gene transcription level. The Klebsiella pneumoniae strains (wabG-deleted strain (SGSB100), budR over-expressed strain (SGSB101), and the budR-deleted strain (SGSB102)) were constructed. The resulting strains were cultivated in unified conditions. Samples were obtained at the lag-, log-, and stationary-phase of cell growth, and gene transcription levels of the budR, 2,3-BDO-biosynthesis-related (budB, budA, and budC), and acid-biosynthesis-related (ldhA and ack) genes were observed. During the lag-phase of cell growth in SGSB101, the budR transcription level increased approximately 8-fold, and 2,3-BDO production increased approximately 2-fold, when compared to SGSB100. Also in SGSB101 the transcription level of the acid-biosynthesis-related genes (ldhA and ack) increased approximately up to 11-fold during the lag-phase of cell growth compared to SGSB100. On contrast, in SGSB102 budR transcription was not detected, and the transcription level of the acid-biosynthesis-related genes (ldhA and ack) decreased approximately 70-fold during the lag-phase of cell growth compared to SGSB100. This is by far the first observation of 2,3-BDO regulation mechanism at gene transcription level in K. pneumoniae, and therefore may be useful for understanding and improving 2,3-BDO biosynthesis metabolic network.
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