RNA-protein Interaction Analysis Service

RNA-binding proteins (RBPs) are master regulators of post-transcriptional gene expression, governing mRNA splicing, localization, stability, translation, and the functions of non-coding RNAs. Precisely mapping the interactions between RBPs and their RNA targets is therefore fundamental to understanding cellular physiology, development, and disease mechanisms. CD BioSciences provides a suite of sensitive and robust RNA-protein interaction analysis services, from validating specific interactions to genome-wide discovery, empowering your research into the dynamic RNA-protein interactome.

Overview of RNA-Protein Interactions

Following transcription, an RNA molecule's fate is determined by a complex network of interactions with specific RBPs. These interactions dictate every step of a RNA's life cycle, forming a critical layer of regulation that is as important as transcription itself. Dysregulation of these interactions is directly linked to a wide array of diseases, including cancer, neurological disorders, and viral pathogenesis. Systematically identifying and characterizing RNA-protein complexes is thus essential for advancing both basic molecular biology and translational medicine.

Fig.1 Schematic diagram summarizing the various roles of RNA binding proteins (RBPs). (Kelaini S, et al., 2021)

Applications of RNA-Protein Interaction Analysis

Mapping RNA-protein interactions provides direct, functional insight into post-transcriptional regulatory networks. It moves beyond correlative expression data to identify the direct targets of an RBP, revealing its mechanistic role. These assays are crucial for studying non-coding RNAs (e.g., lncRNAs, miRNAs) by identifying their protein partners and functional complexes. In disease research, they can pinpoint aberrant RBP binding events that drive pathogenesis. Furthermore, these services are indispensable for drug discovery, enabling the identification and validation of novel therapeutic targets within the RBP-RNA interface.

Our Services

CD BioSciences offers a comprehensive portfolio of RNA-protein interaction analysis services designed to capture these dynamic complexes with high specificity and resolution. Our platform combines classical biochemical methods with next-generation sequencing-based approaches to deliver precise mapping of RBP binding sites, supporting research from mechanistic studies to high-throughput target discovery.

Core Assay Items

RNA Immunoprecipitation (RIP) Service

This service utilizes specific antibodies to immunoprecipitate an RBP of interest along with its bound endogenous RNAs. We offer both RIP-qPCR (for validating suspected targets) and RIP-Seq (for unbiased, genome-wide identification of RNA targets). This approach is ideal for studying native, physiological interactions under various cellular conditions, providing insights into RBP function in processes like stress response, differentiation, and cell cycle regulation.

Crosslinking and Immunoprecipitation (CLIP) Service

Our CLIP service employs UV crosslinking to covalently capture direct RNA-protein interactions in vivo, followed by rigorous purification and high-throughput sequencing. We offer advanced methodologies including HITS-CLIP/CLIP-Seq for genome-wide binding site mapping, PAR-CLIP which utilizes photoreactive nucleoside analogs for high-resolution mapping via mutation analysis, and eCLIP (enhanced CLIP) that incorporates optimized adapters and size-matched input controls to significantly reduce background and improve specificity for the most reliable interaction data.

Service Applications

Mechanistic Studies of RBPs & ncRNAs

1. Genome-wide identification of mRNA and non-coding RNA targets for a novel or uncharacterized RBP.
2. Determination of binding site motifs and structural preferences of an RBP.
3. Investigation of how disease-associated mutations in an RBP alter its RNA binding landscape.

Disease Mechanism & Biomarker Discovery

1. Comparative analysis of RBP interactomes in healthy versus diseased tissue samples.
2. Identification of dysregulated RNA targets in pathways relevant to cancer, neurodegeneration, or autoimmune diseases.
3. Discovery of specific RBP-RNA complexes that can serve as potential diagnostic biomarkers.

Drug Discovery & Therapeutic Development

1. Validation of the direct RNA targets of a therapeutic RBP target.
2. Screening for small molecules or oligonucleotides that disrupt specific pathogenic RBP-RNA interactions.
3. Mode-of-action studies for drugs designed to modulate RBP function.

Service Technologies

UV Crosslinking Platforms

We utilize optimized ultraviolet (UV) crosslinking, primarily at 254 nm, to covalently capture transient RNA-protein interactions within live cells, preserving the native interactome for analysis. For enhanced resolution, PAR-CLIP methodologies incorporate photoreactive nucleoside analogs to achieve precise mapping.

1. Covalent capture of direct, in vivo RNA-protein interactions
2. Single-nucleotide resolution binding site mapping via PAR-CLIP
3. Preservation of native cellular interaction states

High-Stringency RNP Isolation

Following crosslinking, target complexes are isolated under rigorous denaturing conditions using high-specificity antibodies, followed by a series of high-stringency washes to eliminate nonspecific background. Complex-bound RNA is precisely trimmed using controlled RNase digestion.

1. Rigorous purification under denaturing conditions to minimize background
2. High-specificity antibody-based isolation of target complexes
3. Precise RNA footprint isolation via controlled RNase digestion

Integrated NGS & Dedicated Bioinformatics

Purified RNA footprints are converted into sequencing libraries and analyzed on Illumina platforms. The data is processed through a specialized CLIP-seq bioinformatics pipeline for comprehensive analysis.

1. High-depth sequencing on Illumina NGS platforms
2. Specialized bioinformatics pipeline for peak calling and motif discovery
3. Comprehensive functional annotation of binding sites

Service Workflow

Project Design

We initiate with a detailed discussion to understand your research objectives, select the optimal method (RIP or specific CLIP variant), and finalize the experimental design, including sample types and controls.

Sample Prep & Crosslinking

Your provided cells or tissues are processed. For CLIP protocols, samples undergo optimized UV crosslinking to covalently capture direct RNA-protein interactions instantly within the native cellular context.

Cell Isolation & Purification

Cells are lysed under stringent conditions. The target RBP-RNA complex is isolated using high-specificity antibodies coupled to magnetic beads, followed by rigorous washing to remove non-specific associations.

Report Delivery

You receive a comprehensive package including raw/processed data, a full report of high-confidence binding sites, motif analysis, visualization tracks, and publication-ready figures, with expert interpretation support.

Sequencing & Data Analysis

Libraries are subjected to high-depth sequencing on Illumina platforms. Data is processed through a dedicated CLIP analysis pipeline for alignment, peak calling, motif discovery, and functional annotation of binding sites.

Library Construction

On-bead RNA is fragmented, adapter-ligated, and radiolabeled for visualization. Complexes are gel-purified, proteins are digested, and RNA is extracted to build strand-specific cDNA libraries ready for sequencing.

Deliverables

Upon project completion, you will receive a comprehensive data package, including:

1. Detailed experimental protocol and project summary.
2. Raw sequencing data (FASTQ files) and processed alignment files (BAM/BED).
3. A final report listing all high-confidence RBP binding sites (genomic coordinates).
4. Motif analysis results and visualization (sequence logos, genome browser tracks).
5. Functional enrichment analysis (GO, KEGG pathways) of genes associated with binding sites.
6. Publication-ready figures (binding distribution plots, motif logos, volcano plots for differential binding).

Why Choose Us?

1. Methodology Expertise. We offer the full spectrum from standard RIP to state-of-the-art eCLIP, providing guidance to select the most rigorous and appropriate technique for your biological question.
2. Stringent Specificity Controls. All CLIP experiments include critical controls such as size-matched input (SMI) and IgG/bead-only controls to distinguish true signals from background and artifacts.
3. Integrated Wet-Lab & Dry-Lab Pipeline. Our seamless integration of optimized laboratory protocols with advanced, CLIP-dedicated bioinformatics ensures high-quality, interpretable data.
4. Customizable & Collaborative. We work with client-provided antibodies, cell lines, or specific experimental conditions (e.g., drug treatments, knockdowns) to tailor the study to your exact research context.

Frequently Asked Questions (FAQs)

CD BioSciences provides accurate and insightful RNA-protein interaction analysis to decode the complex post-transcriptional regulatory networks governing cell function and disease. By combining deep expertise in ribonucleoprotein biochemistry with cutting-edge sequencing and bioinformatics, we deliver reliable, high-resolution interaction maps tailored to your specific research objectives. Contact us to discuss how we can help map your RBP's functional landscape.

1. Kelaini S, Chan C, Cornelius V A, et al. RNA-binding proteins hold key roles in function, dysfunction, and disease[J]. Biology, 2021, 10(5): 366.