Novel kethoxal derivatives-assisted identification of single-stranded RNA-binding proteins
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo Sapiens
SUBMITTER: 
Xiaocheng Weng
PROVIDER: PXD059447 | iProX | Fri Jan 03 00:00:00 GMT 2025
REPOSITORIES: iProX
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Project description:RNA-binding proteins (RBPs) have essential roles in RNA-mediated gene regulation, and yet annotation of RBPs is limited mainly to those with known RNA-binding domains. To systematically identify the RBPs of embryonic stem cells (ESCs), we here employ interactome capture, which combines UV cross-linking of RBP to RNA in living cells, oligo(dT) capture and MS. From mouse ESCs (mESCs), we have defined 555 proteins constituting the mESC mRNA interactome, including 283 proteins not previously annotated as RBPs. Of these, 68 new RBP candidates are highly expressed in ESCs compared to differentiated cells, implicating a role in stem-cell physiology. Two well-known E3 ubiquitin ligases, Trim25 (also called Efp) and Trim71 (also called Lin41), are validated as RBPs, revealing a potential link between RNA biology and protein-modification pathways. Our study confirms and expands the atlas of RBPs, providing a useful resource for the study of the RNA-RBP network in stem cells.
2018-08-29 | PXD008914 | Pride
Project description:Here, we performed RNA-interactome capture (RIC) on nuclear fractions from human embryonic stem cells (hESCs). The poly(A)+ RNA-bound proteome was determined by UV light-mediated cross-linking (CL) of RNAs to proteins in living cells, followed by nuclei isolation, oligo(dT) purification of poly(A)-RNA-protein complexes, and mass spectrometry analysis of captured proteins. As a control, we applied a similar strategy to non-cross-linked (non-CL) samples. RIC was performed in four independent biological replicates. This data accompanies the manuscript: "Uncovering the RNA-binding protein landscape in the pluripotency network of human embryonic stem cells". Abstract: "Embryonic stem cell (ESC) self-renewal and cell-fate decisions are driven by a broad array of molecular signals. While transcriptional regulators have been extensively studied in human ESCs (hESCs), the extent to which RNA-binding proteins (RBPs) contribute to human pluripotency remains unclear. Here, we carry out a proteome-wide screen and identify 810 proteins that directly bind RNA in hESCs. We reveal that RBPs are preferentially expressed in hESCs and dynamically regulated during exit from pluripotency and early lineage specification. Moreover, we show that nearly 200 RBPs are affected by knockdown of OCT4, a master regulator of pluripotency, several dozen of which are directly bound by this factor. Intriguingly, over 20 percent of the proteins detected in our study are putative DNA- and RNA-binding proteins (DRBPs), among them key transcription factors (TFs). Using fluorescently labeled RNA and seCLIP (single-end enhanced crosslinking and immunoprecipitation) experiments, we discover that the pluripotency-associated STAT3 and OCT4 TFs interact with RNA in hESCs and confirm the direct binding of STAT3 to the conserved NORAD long-noncoding RNA. Taken together, our findings indicate that RBPs have a more widespread role in human pluripotency than previously appreciated, reinforcing the importance of post-transcriptional regulation in stem cell biology".
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Project description:The dNTPase activity of tetrameric SAM and HD domain containing deoxynucleoside triphosphate triphosphohydrolase 1 (SAMHD1) plays a critical role in cellular dNTP regulation. SAMHD1 also associates with stalled DNA replication forks, DNA repair foci, ssRNA, and telomeres. The above functions require nucleic acid binding by SAMHD1, which may be modulated by its oligomeric state. Here we establish that the guanine-specific A1 activator site of each SAMHD1 monomer is used to target the enzyme to guanine nucleotides within single-stranded (ss) DNA and RNA. Remarkably, nucleic acid strands containing a single guanine base induce dimeric SAMHD1, while two or more guanines with ~20 nucleotide spacing induce a tetrameric form. A cryo-EM structure of ssRNA-bound tetrameric SAMHD1 shows how ssRNA strands bridge two SAMHD1 dimers and stabilize the structure. This ssRNA-bound tetramer is inactive with respect to dNTPase and RNase activity.
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Project description:In the current work, we present a comprehensive coverage of the RNA-binding protein (RBP) interactome of Drosophila at four levels of resolution. The highest level tackled in our study represents the RNA-protein complexes, which we address by combining formaldehyde crosslinking of Drosophila S2 cells followed by polyA+ pulldown using oligo-dT beads. On the second level of resolution we identified direct RBPs in the cell using UV crosslinking. Given the paucity of information available on the RNA-binding regions in the Drosophila RBPs that we uncovered, we developed the CAPRI methodology to dissect RNA binding domains (RBDs) on a systematic level. The CAPRI technique provided the final two levels of resolution of our study. The protocol utilised FASP to enable isolation of peptides crosslinked to RNA and peptides adjacent to these crosslinked sites. The CAPRI pipeline mapped both the peptides in proximity to RNA and the precise amino acids contacting RNA. The RNA crosslinked peptide analysis was made by de novo peptide analysis software, PEAKS (Bioinformatics Solutions Inc). In a separate analysis, we also applied FA crosslinking to RBD capture and showed it to be a viable complementary method to the CAPRI workflow. We next applied CAPRI interactome capture to human cells in order to analyse the evolutionary conservation of newly identified RNA binding domains between the two species. These interactome capture techniques and the datasets acquired using them are discussed in detail in the following sections. In summary, we present a comprehensive resource for the study of RNA-protein interactions at a high throughput scale.
2019-07-02 | PXD013338 | Pride
Project description:We developed an anti-dsRNA antibody co-immunoprecipitation coupled with quantitative mass spectrometry to comprehensively identify RBPs bound to cellular dsRNAs. To minimize false positives, we conducted a quantitative mass spectrometry analysis under two additional conditions: first, by treating the samples with RNase T1 to degrade single-stranded RNAs, and second, by performing a pull-down using synthetic double-stranded RNA, poly(I:C). The interactomes through these three methods provide an unbiased and thorough characterization of potential dsRBPs bound to cellular dsRNAs.
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Project description:RNA-binding proteins (RBPs) determine RNA fate from synthesis to decay. Employing two complementary protocols for covalent UV crosslinking of RBPs to RNA, we describe a systematic, unbiased, and comprehensive approach, termed "interactome capture," to define the mRNA interactome of proliferating human HeLa cells. We identify 860 proteins that qualify as RBPs by biochemical and statistical criteria, adding more than 300 RBPs to those previously known and shedding light on RBPs in disease, RNA-binding enzymes of intermediary metabolism, RNA-binding kinases, and RNA-binding architectures. Unexpectedly, we find that many proteins of the HeLa mRNA interactome are highly intrinsically disordered and enriched in short repetitive amino acid motifs. Interactome capture is broadly applicable to study mRNA interactome composition and dynamics in varied biological settings.
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Project description:Novel RNA-guided cellular functions are paralleled by an increasing number of RNA binding proteins (RBPs). We present “serial interactome capture” (serIC), a multiple purification procedure of UV-crosslinked poly(A)-RNA-protein complexes that enables global RBP detection with maximal specificity. We apply serIC to nuclei of proliferating K562 cells to obtain the first human nuclear interactome. The domain composition of the 382 identified nuclear RBPs markedly differs from previous IC experiments, including fewer factors without known RNA binding domains that are in better agreement with computationally predicted RNA binding. serIC extends the number of DNA-RNA binding proteins (DRBPs), and reveals a network of RBPs involved in p53 signaling and double strand break repair. serIC is an effective tool to couple global RBP capture with additional selection or labelling steps for specific detection of highly purified RBPs. The nuclear interactome presented here is a stepping-stone towards deciphering of the functional RNA-protein network in the mammalian nucleus.
2016-10-21 | MSV000080265 | MassIVE
Project description:RNA-binding proteins (RBPs) paly critical roles in regulating the maintenance and differentiation of embryonic stem cells. A critical step in understanding the functions of RBPs is the identification of their bound RNA transcripts. Towards this aim, we developed an inducible strategy named as RNA-Editing-Based-RNA-seq (REB-seq) to capture the potential RNA targets bound by the RBPs-of-interest. Fused with the catalytic domain of ADAR or APOBEC1 that mediate the A to I (A to G) or C to U (C to T) editing, respectively, REB-seq identifies the bound RNAs by transcriptome profiling without the necessity of high-performance antibodies for the RBPs. Using REB-seq, we characterized the mRNAs bound by the m6A readers IGF2BP1, IGF2BP2, and IGF2BP3 in human embryonic stem cells. We also incorporated machine learning strategy to the analysis of REB-seq data to improve the accuracy of target RNA characterization. Furthermore, REB-seq identifies associated single nucleotide polymorphisms that may affect the RBP binding and imply the disease pathogenesis. Collectively, REB-seq coupled with machine learning can be applied to capture RNA transcripts bound by RBPs-of-interest easily and robustly.
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