PT  - JOURNAL ARTICLE
AU  - Nadra Al-Husini
AU  - Dylan T. Tomares
AU  - Zechariah Pfaffenberger
AU  - Nisansala S. Muthunayake
AU  - Mohammad A. Samad
AU  - Tiancheng Zuo
AU  - Obaidah Bitar
AU  - James R. Aretakis
AU  - Mohammed-Husain M. Bharmal
AU  - Alisa Gega
AU  - Julie S. Biteen
AU  - W. Seth Childers
AU  - Jared M. Schrader
TI  - BR-bodies provide selectively permeable condensates that stimulate mRNA decay and prevent release of decay intermediates
AID  - 10.1101/690628
DP  - 2019 Jan 01
TA  - bioRxiv
PG  - 690628
4099  - http://biorxiv.org/content/early/2019/07/05/690628.short
4100  - http://biorxiv.org/content/early/2019/07/05/690628.full
AB  - Biomolecular condensates play a key role in organizing RNAs and proteins into membraneless organelles. Bacterial RNP-bodies (BR-bodies) are a biomolecular condensate containing the RNA degradosome mRNA decay machinery, but the biochemical function of such organization remains poorly defined. Here we define the RNA substrates of BR-bodies through enrichment of the bodies followed by RNA-seq. We find that long, poorly translated mRNAs, small RNAs, and antisense RNAs are the main substrates, while rRNA, tRNA, and other conserved ncRNAs are excluded from these bodies. BR-bodies stimulate the mRNA decay rate of enriched mRNAs, helping to reshape the cellular mRNA pool. We also observe that BR-body formation promotes complete mRNA decay, avoiding the build-up of toxic endo-cleaved mRNA decay intermediates. The combined selective permeability of BR-bodies for both, enzymes and substrates together with the stimulation of the sub-steps of mRNA decay provide an effective organization strategy for bacterial mRNA decay.