Activation of gab cluster transcription in Bacillus thuringiensis by gamma-aminobutyric acid or succinic semialdehyde is mediated by the Sigma 54-dependent transcriptional activator GabR

文献类型： 外文期刊

第一作者： Yang, Min

作者： Yang, Min;Wang, Wei;Han, Lili;Wang, Guannan;Wang, Pengyue;Zhang, Jie;Song, Fuping;Wang, Wei;Wang, Guannan;Wang, Pengyue

作者机构：

关键词： GabR;Sigma 54;GABA;SSA;PAS domain

期刊名称：BMC MICROBIOLOGY （ 影响因子：3.605； 五年影响因子：4.283 ）

ISSN： 1471-2180

年卷期： 2014 年 14 卷

页码：

收录情况： SCI

摘要： Background: Bacillus thuringiensis GabR is a Sigma 54-dependent transcriptional activator containing three typical domains, an N-terminal regulatory domain Per-ARNT-Sim (PAS), a central AAA(+) (ATPases associated with different cellular activities) domain and a C-terminal helix-turn-helix (HTH) DNA binding domain. GabR positively regulates the expression of the gabT gene of the gab gene cluster, which is responsible for the gamma-aminobutyric acid (GABA) shunt. Results: Purified GabR was shown to specifically bind to a repeat region that mapped 58 bp upstream of the gabT start codon. The specific signal factors GABA and succinic semialdehyde (SSA) activated gabT expression, whereas GABA- and SSA-inducible gabT transcription was abolished in sigL and gabR mutants. GABA and SSA did not induce the expression of either SigL or GabR. Deletion of the PAS domain of GabR resulted in increased gabT transcriptional activity, both in the presence and absence of GABA. Conclusions: This study identified the GabR-binding site on the gabT promoter; however, GabR does not bind to its own promoter. gabT transcription is induced by GABA and SSA, and inducible expression is dependent on SigL and activated by GabR. The PAS domain in GabR is repressing its enhancer transcriptional activity on the gabT promoter. Repression is released upon GABA addition, whereupon transcription is induced.

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