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Identification of Protein Interacting Partners Using Tandem Affinity Purification
Published on: February 25, 2012
Tandem affinity purification of miRNA target mRNAs (TAP-Tar)
Nora Nonne1, Maya Ameyar-Zazoua, Mouloud Souidi
1CNRS FRE 2944, Institut André Lwoff, Villejuif F-94801 and Université Paris-Sud, Villejuif F-94801, France.
Abstract:
MicroRNAs (miRNAs) bind to Argonaute proteins, and together they form the RISC complex and regulate target mRNA translation and/or stability. Identification of mRNA targets is key to deciphering the physiological functions and mode of action of miRNAs. In mammals, miRNAs are generally poorly homologous to their target sequence, and target identification cannot be based solely on bioinformatics. Here, we describe a biochemical approach, based on tandem affinity purification, in which mRNA/miRNA complexes are sequentially pulled down, first via the Argonaute moiety and then via the miRNA. Our 'TAP-Tar' procedure allows the specific pull down of mRNA targets of miRNA. It is useful for validation of targets predicted in silico, and, potentially, for discovery of previously uncharacterized targets.
Insights
Researchers developed a new biochemical method, tandem affinity purification for targets of microRNAs (miRNAs), to identify mRNA targets. This technique helps validate predicted targets and discover new ones.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- MicroRNAs (miRNAs) regulate gene expression by binding to Argonaute proteins, forming the RISC complex.
- Identifying miRNA targets is crucial for understanding miRNA function and mechanism of action.
- Bioinformatic prediction of miRNA targets in mammals is challenging due to low sequence homology.
Purpose of the Study:
- To develop a biochemical method for specific identification of messenger RNA (mRNA) targets bound by miRNAs.
- To provide a tool for validating computationally predicted miRNA targets.
- To facilitate the discovery of novel, uncharacterized miRNA targets.
Main Methods:
- A novel biochemical approach termed 'TAP-Tar' (tandem affinity purification for targets of microRNAs) was developed.
- The method utilizes sequential affinity purification, first targeting Argonaute proteins and then the miRNA itself.
- This process specifically isolates mRNA/miRNA complexes.
Main Results:
- The TAP-Tar procedure successfully achieved specific pull-down of miRNA-bound mRNA targets.
- The method demonstrated utility in validating previously predicted miRNA targets.
- The approach holds potential for discovering new, uncharacterized miRNA targets.
Conclusions:
- The TAP-Tar procedure offers a robust biochemical method for identifying miRNA targets.
- This technique enhances the accuracy of miRNA target validation beyond in silico predictions.
- TAP-Tar is a valuable tool for advancing research into miRNA biology and function.
