Small Rna Regulatory Networks In Pseudomonas Putida

Pseudomonas putida is a ubiquitous Gram-negative soil bacterium with a versatile metabolism and ability to degrade various toxic compounds. It has a high tolerance to different future biobased building blocks and various other stringent conditions. It is used in industry to produce some important chemicals and has a potential to be used as an efficient cell factory for various products.

P. putida KT2240 is a genome-sequenced strain and a well characterized pseudomonad. Our major aim is to identify small RNA molecules (sRNAs) and their regulatory networks. A previous study has identified 37 sRNAs in this strain, while in other pseudomonads many more sRNAs have been found so far.P. putida KT2440 has been grown in different conditions which are likely to be encountered in industrial fermentations with the aim of using sRNAs for generation of improved cell factories.

For that, cells have been grown in LB and harvested in different growth phases, as well as osmotic, membrane and oxidative stress conditions. RNA sequencing data has been analysed with the open source software system Rockhopper, and it has revealed over 180 putative sRNAs. Most of them (86%) seem to be novel and uncharacterized.

The majority of the identified sRNAs are trans-encoded and several 3’UTR derived RNA transcripts have been found, as previously described by Chao et al.Differential sRNA expression is observed across various growth and stress conditions, suggesting that individual sRNAs are functional and exert their regulatory effects under specific conditions.

The sRNA response profiles in different conditions will be presented, and sRNAs important for bacterial adaptation under the studied conditions will be identified.