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Recombinant Protein Expression, Crystallization, and Biophysical Studies of a Bacillus-conserved Nucleotide Pyrophosphorylase, BcMazG
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Function of global regulator CodY in Bacillus thuringiensis BMB171 by comparative proteomic analysis
Mingxia Qi1, Fei Mei, Hui Wang
1State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Hongshan District, Wuhan 430070, P.R. China.
Journal of Microbiology and Biotechnology
|September 17, 2014
Summary
CodY protein regulates essential functions in Bacillus thuringiensis, including metabolism and sporulation. This study identifies direct gene targets, advancing our understanding of CodY
Area of Science:
- Microbiology
- Molecular Biology
- Biochemistry
Background:
- CodY is a conserved transcriptional regulator in low G+C gram-positive bacteria.
- Its regulatory role in Bacillus thuringiensis, a key entomopathogenic species, remains largely uncharacterized.
- Bacillus thuringiensis is known for its ability to form spores and parasporal crystals.
Purpose of the Study:
- To investigate the function of the CodY protein in Bacillus thuringiensis.
- To identify genes and pathways directly regulated by CodY.
- To elucidate CodY's role in sporulation and metabolism.
Main Methods:
- Construction of a B. thuringiensis codY mutant (BMB171codY(-)).
- Comparative proteomic analysis using two-dimensional gel electrophoresis and MALDI-TOF-MS/MS.
- Bacterial one-hybrid and electrophoretic mobility shift assays (EMSA).
Main Results:
- CodY regulates genes involved in branched-chain amino acid, carbohydrate, fatty acid, and energy metabolism.
- CodY influences sporulation, poly-β-hydroxybutyrate biosynthesis, growth, genetic competence, and translation.
- Direct CodY regulation confirmed for genes related to branched-chain amino acid metabolism, ribosomal recycling factor FRR, and ComER.
Conclusions:
- CodY plays a significant role in regulating diverse physiological processes in Bacillus thuringiensis.
- This study provides foundational insights into CodY-mediated gene regulation in this bacterium.
- Identified CodY targets offer potential for biocatalysis applications in other bacterial species.
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