Online inquiry

RAP for RNA-Protein Interactions Analysis

Armed with advanced technical equipment and abundant experience, Creative Biolabs provides one-stop RNA-protein interaction analysis services using the RAP method to meet your scientific research goal.

Introduction to RAP Technology

RNA antisense purification (RAP) is a novel technology for the detection of RNA-RNA and RNA-protein interactions. Developed by Engreitz et al. in 2013, RAP was an RNA-centric biochemical purification method mainly designed for the characterization of large noncoding RNA (lncRNA)-a group of critical regulators in chromatin structure, gene expression, and cellular activities.

Firstly, the RAP utilizes the biotinylated antisense RNA as probes to target endogenous RNA, specifically the complementary part of antisense RNA by base-pairing in the RNA-protein complexes. Then, the biotinylated RNA-protein complexes are incubated with streptavidin-coated magnetic beads, by which the target RNA-protein complexes are pulled down and precipitated. Afterward, other analytical tools, such as high-throughput sequencing and mass spectrometry, are used to identify the genes and proteins that interact with the target RNA. Besides, the RAP is also known as RNA pull-down assays or RNA affinity purification, which has been able to map RNA-DNA/RNA-protein interactions in vivo.

Schematic diagram of RAP. Fig.1 Schematic diagram of RAP. (Engreitz, 2013)

RAP for RNA-Protein Interactions Analysis

RNA-protein interactions have profound effects on gene expression regulation, including pre-mRNA splicing, RNA stabilization, and localization, as well as protein translation. Understanding RNA-protein interaction and its mechanism are of great significance to the elaboration of a series of biological and pathological processes.

Multiple methods have been developed for the analysis of RNA-protein interactions, including chromatin isolation by RNA purification (ChIRP), RNA immunoprecipitation (RIP), cross-linking and immunoprecipitation (CLIP). RAP technology has exhibited multiple advantages in RNA-protein interaction analysis. Compared to these similar techniques, the most significant and critical feature of RAP is using a long antisense biotinylated oligo probe (>60 nucleotides) to cover the entire target RNA. Besides, the RAP also features with:

  • High binding affinity and sensitivity
  • High resolution
  • Genomic mapping of target RNAs
  • Diversity: the target of interaction can be DNA, RNA, and proteins

At Creative Biolabs, technical experts have developed a comprehensive set of in vitro and in vivo assays for the analysis of RNA-protein interactions. Added by our advanced platform (especially sequencing technologies and liquid chromatography-mass spectrometry (LC-MS)), we offer fast and custom RNA-protein interactions analysis services based on the RAP method. Besides, RNA-protein interactions analysis by other methods is also available, which mainly includes but is not limited to ChIRP, RIP, and CLIP.

For specific analysis, please do not hesitate to contact us for more details. Our scientists will satisfy you with suitable methods and solutions.


  1. Engreitz, J. M.; et al. The Xist lncRNA exploits three-dimensional genome architecture to spread across the X-chromosome. Science. 2013, 341(6147): 1237973.
All products and services are For Research Use Only and CANNOT be used in the treatment or diagnosis of disease.