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Chlamydia infect millions worldwide and cause infertility and blinding trachoma. Chlamydia trachomatis (C. trachomatis) is an obligate intracellular gram-negative pathogen with a significantly reduced genome. This bacterium shares a unique biphasic lifecycle in which it alternates between the infectious, metabolically inert elementary bodies (EB) and the non-infections, metabolically active replicative reticular bodies (RB).
One of the challenges of working with Chlamydia is its difficult genetic accessibility. In the present work, the high-throughput method TagRNA-seq was used to differentially label transcriptional start sites (TSS) and processing sites (PSS) to gain new insights into the transcriptional landscape of C. trachomatis in a coverage that has never been achieved before. Altogether, 679 TSSs and 1067 PSSs were detected indicating its high transcriptional activity and the need for transcriptional regulation. Furthermore, the analysis of the data revealed potentially new non-coding ribonucleic acids (ncRNA) and a map of transcriptional processing events. Using the upstream sequences, the previously identified σ66 binding motif was detected.
In addition, Grad-seq for C. trachomatis was established to obtain a global interactome of the RNAs and proteins of this intracellular organism. The Grad-Seq data suggest that many of the newly annotated RNAs from the TagRNA-seq approach are present in complexes. Although Chlamydia lack the known RNA-binding proteins (RBPs), e.g. Hfq and ProQ, observations in this work reveal the presence of a previously unknown RBP.
Interestingly, in the gradient analysis it was found that the σ66 factor forms a complex with the RNA polymerase (RNAP). On the other hand, the σ28 factor is unbound. This is in line with results from previous studies showing that most of the genes are under control of σ66. The ncRNA IhtA is known to function via direct base pairing to its target RNA of HctB, and by doing so is influencing the chromatin condensation in Chlamydia. This study confirmed that lhtA is in no complex. On the other hand, the ncRNA ctrR0332 was found to interact with the SNF2 protein ctl0077, a putative helicase. Both molecules co-sedimented in the gradient and were intact after an aptamer-based RNA pull-down. The SWI2/SNF2 class of proteins are nucleosome remodeling complexes. The prokaryotic RapA from E. coli functions as transcription regulator by stimulating the RNAP recycling. This view might imply that the small ncRNA (sRNA) ctrR0332 is part of the global regulation network in C. trachomatis controlling the transition between EBs and RBs via interaction with the SNF2 protein ctl0077.
The present work is the first study describing a global interactome of RNAs and proteins in C. trachomatis providing the basis for future interaction studies in the field of this pathogen.