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KMID : 0364820180540010001
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Korean Journal of Microbiology
2018 Volume.54 No. 1 p.1 ~ p.8
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Regulation of gene expression by histone-like proteins in bacteria
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Park Shin-Ae
Lee Jung-Shin
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Abstract
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A prokaryotic cell has various histone-like proteins also known as nucleoid-associated proteins (NAPs). These proteins bind ATrich sequence at DNA, which induce DNA wrapping, bending, and bridging, and subsequently regulate the gene expression in bacteria. Because NAPs function in transcriptional silencing of virulence genes, it is important to study their roles in gene silencing and specific mechanisms of these proteins. In this review, we discussed two well-known NAPs, H-NS, and HU, and summarized their roles for gene expression in Escherichia coli and Salmonella Typhimurium. Through the oligomerization and filamentation of H-NS, it represses the expression of virulence genes in human pathogenic bacteria, such as Salmonella Typhimurium, and it works with other NAPs positively or negatively. Recently, H-NS also regulates typhoid toxin expression, which causes typhoid fever and systemic disease in human. Additionally, HU regulates the expression of genes related to both virulence and physiology of Salmonella. Therefore, we suggest that NAPs like H-NS and HU are crucial factors to reveal the molecular mechanisms of virulence gene expression in bacteria.
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KEYWORD
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gene expression, histone-like protein, H-NS, HU, NAP
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