Using 14mer affinity pulldown to identify sRNA associating proteins in the bacterium Deinococcus radiodurans

ABSTRACT: We employed a 14-mer pulldown protocol that was originally developed for eukaryotic miRNA interacting RBPs. In this assay, the sRNA (Dsr2) and a scrambled RNA with the same length were in vitro transcribed with a 5 located, 14 nt long tag and subsequently incubated with D. radiodurans lysates. The resulting co-purified proteins were subjected to LC-MS/MS. Using this alternative approach (hereinafter referred to as 14 mer pull-down), we successfully enriched a total of 66 proteins in the 14 mer Dsr2 samples compared to the control sample. Except for several metabolic and hypothetical proteins, many of these proteins have potential nucleic acid binding functions were enriched, including three ribosomal proteins, two translation initiation factors, two TetR transcriptional regulators, five tRNA modification or processing proteins, DNA polymerase I, and five DNA repair proteins (e.g., RuvB, SbcD, and RecR). DR_2281 is one of the most enriched RBPs which contains a double stranded RNA binding motif (DSBM) but its function is unknown. In contrast, five other proteins (PNPase, RhlB, Ffh, DR_2281, KhpA and KhpB) were known as RBPs previously or contain known RNA binding domains. PNPase, RhlB, and Ffh have been revealed to play crucial roles in oxidative stress response in D. radiodurans by interacting with either oxidized RNA or Signal Recognition Particle RNA (Qpr6). PNPase also plays an indispensable role in paradoxically stabilizing sRNAs bound to other RBPs and promoting their function in gene regulation in E. coli (indicating a similar role of PNPase in D. radiodurans).

INSTRUMENT(S): LTQ Orbitrap Elite

ORGANISM(S): Deinococcus Radiodurans (ncbitaxon:1299)

SUBMITTER: Lydia M. Contreras  

PROVIDER: MSV000094855 | MassIVE | Thu May 23 13:45:00 BST 2024

SECONDARY ACCESSION(S): PXD052535

REPOSITORIES: MassIVE