Regulatory role of cAMP receptor protein over Escherichia coli fumarase genes

Yu Pei Chen, Hsiao Hsien Lin, Chi Dung Yang, Shin Hong Huang, Ching-Ping Tseng*


研究成果: Article同行評審

7 引文 斯高帕斯(Scopus)


Escherichia coli expresses three fumarase genes, namely, fumA, fumB, and fumC. In the present study, catabolite repression was observed in the fumA-lacZ and fumC-lacZ fusion strains, but not in the fumB-lacZ fusion strain. The Crp-binding sites in fumA and fumC were identified using an electrophoretic mobility shift assay and footprint analysis. However, the electrophoretic mobility shift assay did not detect band shifts in fumB. Fnr and ArcA serve as transcription regulators of fumarase gene expression. In relation to this, different mutants, including Δcya, Δcrp, Δfnr, and ΔarcA, were used to explore the regulatory role of Crp over fumA and fumC. The results show that Crp is an activator of fumA and fumC gene expression under various oxygen conditions and growth rates. ArcA was identified as the dominant repressor, with the major repression occurring at 0-4% oxygen. In addition, Fnr was confirmed as a repressor of fumC for the first time. This study elucidates the effects of Crp on fumarase gene expression.

頁(從 - 到)426-433
期刊Journal of Microbiology
出版狀態Published - 1 6月 2012


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