The RNA processing enzyme polynucleotide phosphorylase negatively controls biofilm formation by repressing poly-N-acetylglucosamine (PNAG) production in Escherichia coli C

BMC Microbiology

Paolo Landini¹  Federica Briani¹  Gianni Dehò¹  Davide Antoniani¹  Thomas Carzaniga¹ 

[1] Department of Biosciences, University of Milan, Via Celoria 26, Milan, 20133, Italy

关键词: PNPase;    Cell adhesion;    EPS;    Degradosome;    RNA processing;    Biofilm;   

Others  :  1144953
DOI  :  10.1186/1471-2180-12-270

 received in 2012-06-19, accepted in 2012-10-01,  发布年份 2012

【 摘 要 】

Background

Transition from planktonic cells to biofilm is mediated by production of adhesion factors, such as extracellular polysaccharides (EPS), and modulated by complex regulatory networks that, in addition to controlling production of adhesion factors, redirect bacterial cell metabolism to the biofilm mode.

Results

Deletion of the pnp gene, encoding polynucleotide phosphorylase, an RNA processing enzyme and a component of the RNA degradosome, results in increased biofilm formation in Escherichia coli. This effect is particularly pronounced in the E. coli strain C-1a, in which deletion of the pnp gene leads to strong cell aggregation in liquid medium. Cell aggregation is dependent on the EPS poly-N-acetylglucosamine (PNAG), thus suggesting negative regulation of the PNAG biosynthetic operon pgaABCD by PNPase. Indeed, pgaABCD transcript levels are higher in the pnp mutant. Negative control of pgaABCD expression by PNPase takes place at mRNA stability level and involves the 5’-untranslated region of the pgaABCD transcript, which serves as a cis-element regulating pgaABCD transcript stability and translatability.

Conclusions

Our results demonstrate that PNPase is necessary to maintain bacterial cells in the planktonic mode through down-regulation of pgaABCD expression and PNAG production.

【 授权许可】

   
2012 Carzaniga et al.; licensee BioMed Central Ltd.

【 图 表 】

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