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Genome‐wide mapping of transcription start sites yields novel insights into the primary transcriptome of Pseudomonas putida
Author(s) -
D'Arrigo Isotta,
Bojanovič Klara,
Yang Xiaochen,
Holm Rau Martin,
Long Katherine S.
Publication year - 2016
Publication title -
environmental microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.954
H-Index - 188
eISSN - 1462-2920
pISSN - 1462-2912
DOI - 10.1111/1462-2920.13326
Subject(s) - biology , orfs , riboswitch , pseudomonas putida , genetics , gene , transcriptome , genome , transcription (linguistics) , open reading frame , rna , non coding rna , computational biology , gene expression , peptide sequence , linguistics , philosophy
Summary The environmental bacterium Pseudomonas putida is an organism endowed with a versatile metabolism and stress tolerance traits that are desirable in an efficient production organism. In this work, differential RNA sequencing was used to investigate the primary transcriptome and RNA regulatory elements of P. putida strain KT2440. A total of 7937 putative transcription start sites (TSSs) were identified, where over two‐thirds were located either on the opposite strand or internal to annotated genes. For TSSs associated with mRNAs, sequence analysis revealed a clear Shine–Dalgarno sequence but a lack of conserved overrepresented promoter motifs. These TSSs defined approximately 50 leaderless transcripts and an abundance of mRNAs with long leader regions of which 18 contain RNA regulatory elements from the Rfam database. The thiamine pyrophosphate riboswitch upstream of the thiC gene was examined using an in vivo assay with GFP‐fusion vectors and shown to function via a translational repression mechanism. Furthermore, 56 novel intergenic small RNAs and 8 putative actuaton transcripts were detected, as well as 8 novel open reading frames (ORFs). This study illustrates how global mapping of TSSs can yield novel insights into the transcriptional features and RNA output of bacterial genomes.