Name: detection of rna-binding proteins by in vitro rna pull-down in adipocyte culture
Uploaded: 2016-07-22T15:00:00
Description: Watch this Scientific Journal Video about Detection of RNA-binding Proteins by In Vitro RNA Pull-down in Adipocyte Culture at JoVE.com

This work was funded by Singapore NRF fellowship (NRF-2011NRF-NRFF001-025) as well as CBRG (NMRC/CBRG/0070/2014).

NOTE: The RNA of interest in the context of this study is a fragment of AR 3&#39;UTR.
1. Preparation of Biotin-labeled RNA
<ol>
	<li>To obtain the RNA, amplify T7-AR-oligo by PCR, followed by in vitro transcription using a commercial kit and following manufacturer&#39;s instructions11. 
	NOTE: Primers for PCR are listed in Table 4: T7-AR-F and T7-AR-R.</li>
	<li>For non-specific binding control, amplify a partial sequence of the firefly luciferase (F...

<ol>
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lncRNAs and RBPs have vital roles in health and disease, however the molecular mechanisms of these molecules are poorly understood. Identification of proteins that interact with lncRNA molecules is a key step towards elucidating the regulatory mechanisms. Enrichment of RBPs by the RNA pull-down assay system is based on in-solution capture of interacting complex so that proteins from a cell lysate can be selectively extracted using biotinylated RNA baits bound to streptavidin magnetic beads. Several other methods such as ...

A correction to the author list was made to: <a href="http://www.jove.com/video/54207/detection-rna-binding-proteins-vitro-rna-pull-down-adipocyte">Detection of RNA-binding Proteins by In Vitro RNA Pull-down in Adipocyte Culture</a>.
The author list has been updated from:
Qianfan Bai1*, Zhiqiang Bai1*, Lei Sun1,2
1Cardiovascular and Metabolic Disorders Program, Duke-NUS Medical School
2Institute of Molecular and Cell Biology, Singapore
*These authors contributed equally
to:
Qianfan Bai1*, Zhiqiang Bai1*, Shaohai Xu3, Lei Sun1,2
1Cardiovascular and Metabolic Disorders Program, Duke-NUS Medical School
2Institute of Molecular and Cell Biology, Singapore
3Division of Bioengineering, School of Chemical &#38; Biomedical Engineering, Nanyang Technological University
*These authors contributed equally

A correction to the author list was made to: Detection of RNA-binding Proteins by In Vitro RNA Pull-down in Adipocyte Culture.

Erratum: Detection of RNA-binding Proteins by In Vitro RNA Pull-down in Adipocyte Culture

RBPs are proteins that bind to the double or single stranded RNA in cells and participate in forming RNA-protein complexes. RBPs may bind a variety of RNA species, including mRNA and long noncoding RNAs (lncRNAs), and exert their influence at post-transcriptional levels. Both RBPs and lncRNAs are emerging as novel regulators in adipose development and function1,2,3. To understand the mechanism of RBP- and lncRNA-mediated regulation of cellular pathways, it is often necessary to detect the interaction between a specific RNA molecule and one or several RBPs, and, sometimes, to identify the full spectrum of protein partners of a RNA transcript. However, the experiment can be challenging due to the high content of lipids in adipocytes. The RNA pull-down protocol described here can be employed to retrieve the protein partners of a specific RNA from the adipocyte lysates of primary cultures4,5.
Rationale for this protocol is summarized as follows. An RNA bait is in vitro transcribed from an DNA template, biotin-labeled and conjugated to streptavidin-coated magnetic beads4. The RNA bait is incubated with cellular lysates to allow for the formation of RNA-protein complexes, which are subsequently pulled down on a magnetic stand. More specifically, the RNA pull-down protocol described below use an RNA fragment from AR 3&#39;UTR as the bait to retrieve HuR protein, a universally expressed RBP bound to 3&#39;UTR of mRNAs6,7, from theadipocytelysate of primary culture. To test the binding specificity of this assay, a non-relevant RNAas well as blank streptavidin beads is included as control. This protocol is compatible with western blotting or mass spectrometry (MS) to confirm the capture of a specific RBP or to identify the full repertory of captured RBPs, respectively8.
Several techniques are available to study RNA-protein interactions. To reveal RNAs bound by a given RBP, RIP (RNA immunoprecipitation) and CLIP (UV crosslinking and immunoprecipitation) can be applied. In contrast, to identify protein partners of a given RNA, RNA pull-down, ChIRP (chromatin isolation by RNA purification), CHART (capture hybridization analysis of RNA targets) and RAP (RNA antisense purification) can be applied. In comparison with the later ones, RNA pull-down technique takes less effort to set up. It can be employed to capture proteins in vitro and in vivo. The in vivo approach of RNA pull-down, which is technically more challenging than its in vitro counterpart, preserves RNA-protein interactions by crosslinking in cells, captures aptamer-tagged RNAs of interest from cells, and subsequently detects bound RBPs. RNA pull-down can be used to enrich low abundant RBPs, and to isolate and identify the RNA-protein complexes that have diverse functional roles in controlling cellular regulation9,10.

<table border="0" cellpadding="0" cellspacing="0" width="857">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:499px;">Major materials used in this study.</td>
			<td style="width:177px;"></td>
			<td style="width:109px;"></td>
			<td style="width:72px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">MEGAscript kit</td>
			<td>&#160;Ambion</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Biotin-14-CTP&#160;</td>
			<td>Invitrogen</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">NucAway spin columns&#160;</td>
			<td>Ambion</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Dynabeads M-280 Streptavidin&#160;</td>
			<td>Invitrogen</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">HuR (3A2) mouse monoclonal antibody (sc-5261)&#160;</td>
			<td>Santa Cruz Biotechnology</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Goat anti-mouse IgG-HRP(sc-2005)&#160;</td>
			<td>Santa Cruz Biotechnology</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Hypure Molecular Biology Grade Water (nuclease-free)&#160;</td>
			<td>HyClone</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Phosphate Buffer Saline (1&#215;PBS)</td>
			<td>&#160;HyClone</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">RNase inhibitor&#160;</td>
			<td>Bioline</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Protease inhibitor&#160;</td>
			<td>Sigma</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Pfu Turbo DNA polymerase&#160;</td>
			<td>Agilent Technologies</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">TRIsure</td>
			<td>&#160;Bioline</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Name</td>
			<td>Company</td>
			<td>Catalog Number</td>
			<td>Comments</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Major equipment used in this study.</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sorvall Legend Micro 21R centrifuge&#160;</td>
			<td>Thermo Scientific</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Sorvall Legend X1R centrifuge&#160;</td>
			<td>Thermo Scientific</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Bio-Rad T100 thermal cycler&#160;</td>
			<td>Bio-Rad</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Nanodrop 2000&#160;</td>
			<td>Thermo Scientific</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">BOECO rotator Multi Bio RS-24&#160;</td>
			<td>BOECO,Germany</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Protein gel electrophoresis and blotting apparatus&#160;</td>
			<td>Bio-Rad</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">DynaMag-2 magnet&#160;</td>
			<td>Life Technologies</td>
			<td></td>
			<td></td>
		</tr>
	</tbody>
</table>

detection of rna-binding proteins by in vitro rna pull-down in adipocyte culture

RNA-binding proteins (RBPs) are emerging as a regulatory layer in the development and function of adipose. RBPs play a key role in the gene expression regulation at posttranscriptional levels by affecting the stability and translational efficiency of target mRNAs. RNA pull-down technique has been widely used to study RNA-protein interaction, which is necessary to elucidate the mechanism underlying RBPs&#39; as well as long non-coding RNAs&#39; (lncRNAs) function. However, the high lipid abundance in adipocytes poses a technical challenge in conducting this experiment. Here a detailed RNA pull-down protocol is optimized for primary adipocyte culture. An RNA fragment from androgen receptor&#39;s (AR) 3&#39; untranslated region (3&#39;UTR) containing an adenylate-uridylate-rich elementwas used as an example to demonstrate how to retrieve its RBP partner, HuR protein, from adipocyte lystate. The method described here can be applied to detect the interactions between RBPs and noncoding RNAs, as well as between RBPs and coding RNAs.

In this demo experiment, an AR RNA fragment was used as the bait to capture its binding protein HuR. Both a FL RNA bait that is non-relevant to HuR protein, and an aliquot of unconjugated blank streptavidin beads served as negative controls. RNA-protein interactions can occur either in nucleus or cytoplasm, and this pull-down protocol can be applied to either total or fractionated (nuclear or cytoplasmic) cell lysates. Analysis of proteins by western blotting shows that the sample of 15 &...

Watch this Scientific Journal Video about Detection of RNA-binding Proteins by In Vitro RNA Pull-down in Adipocyte Culture at JoVE.com

Detection of RNA-binding Proteins by In Vitro RNA Pull-down in Adipocyte Culture

An RNA pull-down protocol is optimized here for detection of interactions between RNA-binding proteins (RBPs) and noncoding as well as coding RNAs. An RNA fragment from androgen receptor (AR) was used as an example to demonstrate how to retrieve its RBP from lystate of primary brown adipocytes.

Detection of RNA-binding Proteins by In Vitro RNA Pull-down in Adipocyte Culture

RNA-binding proteins (RBPs) are emerging as a regulatory layer in the development and function of adipose. RBPs play a key role in the gene expression ...

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