Name: novel rna-binding proteins isolation by the rapid methodology
Uploaded: 2016-09-30T14:00:00
Description: Watch this Scientific Journal Video about Novel RNA-Binding Proteins Isolation by the RaPID Methodology at JoVE.com

Wir danken Prof. Jeff Gerst und Boris Slobodin für ihre hilfreiche Ratschläge bei der schnellen Protokoll der Einrichtung und Bereitstellung der erforderlichen Plasmide. Wir danken auch Dr. Avigail Atir-Lande für ihre Hilfe dieses Protokoll und Dr. Tamar Ziv vom Smoler Proteomics Zentrum für ihre Hilfe bei der LC-MS / MS-Analyse zu etablieren. Wir danken Prof. TG Kinzy (Rutgers) für den YEF3 Antikörper. Diese Arbeit wurde durch Gewährung 2011013 vom Binationale Science Foundation unterstützt.

Hinweis: eine Sequenz einfügen, bestehend aus 12 MS2-Bindungsstellen (MS2 Schleifen; MS2L) in den genomischen Locus gewünschten, in der Regel zwischen dem offenen Leserahmen (ORF) und der 3&#39;-UTR. Ein detailliertes Protokoll für diese Integration wird an anderer Stelle 22 vorgesehen. Stellen Sie sicher , die richtige Insertion und Expression durch PCR, Northern - Analyse oder RT-PCR 20,23. Es ist wichtig zu überprüfen, dass die Integration nicht mit der Synthese des 3&#39;-UTR nicht beigetr...

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Verschiedene Methoden verwenden , um die Isolierung von spezifischen mRNAs ihre zugehörigen Proteine 11,34 35 zu identifizieren. Diese Verfahren gelten in vitro und in vivo - Strategien RNA-Protein - Wechselwirkungen zu untersuchen. In - vitro - Verfahren inkubieren exogen RNA mit Zelllysat transkribiert RBPs zu erfassen und RNP - Komplexe 36,37 isolieren. Ein wirksames Konzept dieser Art wurde kürzlich vorgestellt, die die Identifizierung neuer Prot...

RNA-bindende Proteine (RBPs) stellen etwa 10% der S. cerevisiae Proteine 1,2 und etwa 15% von Säugetierproteinen 3-5. Sie sind in vielen zellulären Prozessen wie mRNA posttranskriptionales Verarbeitung und Regulation, Übersetzung, Ribosomenbiogenese, tRNA-Aminoacylierung und Modifikation, Chromatin-Remodeling beteiligt, und vieles mehr. Eine wichtige Untergruppe von RBPs ist die mRNA-bindende Proteine (mRNPs) 6,7. Im Zuge der mRNA Reifung, binden verschiedene RBPs das Transkript und vermitteln ihre Kern Verarbeitung, Export aus dem Zellkern, zelluläre Lokalisation, Übersetzung und Abbau 6-8. Somit bestimmt die unterschiedliche Menge von RBPs auf ein bestimmtes Transkript zu jedem Zeitpunkt verpflichtet, ihre Verarbeitung und letztlich sein Schicksal. Die Identifizierung von RBPs mit einer mRNA verbunden sind, könnten unser Verständnis der Prozesse zugrunde liegen, ihre Post-Transkriptionsregulation verbessern. Diverse genetischeWurden in mRNA Regulation beteiligten Proteine zu identifizieren (in 9-11 prüft), mikroskopische, biochemische und bioinformatische Methoden verwendet. Jedoch nur wenige dieser Verfahren ermöglichen die Identifizierung von Proteinen mit einer bestimmten Ziel-mRNA assoziiert. Bemerkenswert ist die Hefe-Drei-Hybrid-System (Y3H), die die mRNA von Interesse als Köder verwendet eine Expressionsbibliothek in Hefezellen zu screenen. Positive Klone werden in der Regel durch eine Wachstumsselektion oder Reporterexpression 12-14 beobachtet. Der Hauptvorteil dieses Verfahrens ist die große Anzahl von Proteinen, die in einer zellulären Umgebung und die Fähigkeit, abgetastet werden kann, die Festigkeit des RNA-Protein-Wechselwirkung zu messen. Nachteile sind die relativ große Anzahl an falsch positiven Ergebnissen aufgrund der unspezifischen Bindung, und das hohe Potenzial für falsch negative Ergebnisse darauf zurückzuführen, zum Teil auf Fehlfaltungen des Fusionsproteins Beute oder der Köder-RNA. Eine Alternative zur genetischen Ansatz ist Affinität purifiKation RNA mit seinen assoziierten Proteinen. Poly A enthaltenden mRNAs kann durch die Verwendung von Oligo-dT-Säulen isoliert werden, und deren assoziierte Proteine ​​durch Massenspektrometrie detektiert werden. Die RNA-Protein-Wechselwirkung in seinem zellulären Kontext durch Vernetzung erhalten, die Kurzstrecken-kovalente Bindungen macht. Die Verwendung der Oligo - dT - Säule ergibt eine globale Sicht auf die gesamte Proteom , die mit jeder Poly - A-haltige mRNA 3,5,15 zugeordnet ist. Allerdings bedeutet dies nicht eine Liste von Proteinen bereitzustellen, die mit einer bestimmten mRNA assoziiert sind. Nur sehr wenige Methoden zur Verfügung, eine solche Identifikation zu erreichen. Das Paar Verfahren beinhaltet die Transfektion von Nukleinsäure mit Komplementarität zum Ziel - mRNA 16,17. Die Nukleinsäure wird auch an ein Peptid gebunden, das in der Nähe des Interaktionsstelle zu RBPs Vernetzung ermöglicht. Nach der Vernetzung kann das RBP-Peptid-Nukleinsäure isoliert und Proteomik-Analyse unterzogen werden. Vor kurzem wurde ein Aptamer-basierte Methodikerfolgreich angewendet 18 aus Säugerzelllinien extrahiert. Ein RNA-Aptamer mit verbesserter Affinität an Streptavidin wurde auf eine Sequenz von Interesse (AU-rich Element (ARE) in diesem Fall) entwickelt und aufgeschmolzen. Das Aptamer-ARE-RNA wurde an Streptavidin-Kügelchen und gemischt mit Zelllysat angebracht. Proteine, die mit der ARE-Sequenz zugeordnet wurden gereinigt und identifiziert durch Massenspektrometrie (MS). Obwohl dieses Verfahren Verbände detektiert , die außerhalb der zellulären Einstellungen auftreten (dh in vitro), ist es wahrscheinlich in der Zukunft modifiziert werden , um die Aptamere in das Genom einzuführen und somit die Isolierung von Proteinen mit der mRNA , während in der zugeordneten Freigabe Zellmilieu (dh in vivo). In Hefe, wo genetische Manipulationen gut etabliert sind, bietet die schnelle Methode (entwickelt von Prof. Jeff Gerst Labor) eine Ansicht der in vivo - Vereinigungen 19. RaPID kombiniert die spezifische und starke Bindung des MS2-Hüllprotein (MS2-CP) an die MS2-RNA-Sequenz und der Streptavidin-Bindungsdomäne (SBP) konjugierte Kügelchen an Streptavidin. Dies ermöglicht eine effiziente Reinigung von MS2-markierten mRNAs durch Streptavidinkügelchen. Darüber hinaus wird die Expression von 12 Kopien von MS2-Schleifen können bis zu sechs MS2-CPs bis gleichzeitig an die RNA binden und die Effizienz seiner Isolation zu erhöhen. Dieses Protokoll wurde daher vorgeschlagen, die Identifizierung neuer mRNA-assoziierten Proteinen zu ermöglichen, sobald die eluierten Proben Proteomik-Analyse durch Massenspektrometrie unterzogen werden. Wir RaPID kürzlich verwendet , um neue Proteine zu identifizieren mit der Hefe assoziiert PMP1 mRNA 20. PMP1 mRNA wurde zuvor gezeigt , mit der ER - Membran und dessen 3&#39; - untranslatierten Region (UTR) wurde 21 in diesem Verband eine wichtige Determinante erwiesen assoziiert. So RBPs die PMP1 3 &#39;UTR binden , sind wahrscheinlich eine wichtige Rolle bei der Lokalisierung zu spielen. RaPID gefolgt von Flüssigkeitschromatographeny-Massenspektrometrie / Massenspektrometrie (LC-MS / MS) führte zur Identifizierung vieler neuer Proteine , die mit PMP1 20 interagieren. Wir berichten hier über ein detailliertes Protokoll der Methodik RaPID bieten, wichtige Kontrollen, die getan werden müssen, und technische Tipps, die Ausbeute und Spezifität verbessern kann.

<table border="0" cellpadding="0" cellspacing="0" width="632">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:239px;">Tris</td>
			<td style="width:107px;">sigma</td>
			<td style="width:119px;">T1503</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">SDS</td>
			<td>bio-lab</td>
			<td align="right">1981232300</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">DTT</td>
			<td>sigma</td>
			<td>D9779</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Acidic Phenol (pH 4.3)</td>
			<td>sigma</td>
			<td>P4682</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Acidic Phenol: Chloroform (5:1, pH 4.3)</td>
			<td>sigma</td>
			<td>P1944</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Chloroform</td>
			<td>bio-lab</td>
			<td align="right">3080521</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Formaldehyde</td>
			<td>Frutarom</td>
			<td align="right">5551820</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Glycine</td>
			<td>sigma</td>
			<td>G7126</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">NP-40</td>
			<td>Calbiochem</td>
			<td align="right">492016</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Heparin</td>
			<td>Sigma</td>
			<td>H3393</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Phenylmethylsulfonyl Flouride (PMSF)</td>
			<td>Sigma</td>
			<td>P7626</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Leupeptin</td>
			<td>Sigma</td>
			<td>L2884</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Aprotinin</td>
			<td>Sigma</td>
			<td>A1153</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Soybean Trypsin Inhibitor</td>
			<td>Sigma</td>
			<td>T9003</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Pepstatin</td>
			<td>Sigma</td>
			<td>P5318</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">DNase I</td>
			<td>Promega</td>
			<td>M610A</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Ribonuclease&#160; Inhibitor</td>
			<td>Takara</td>
			<td>2313A</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Glass Beads</td>
			<td>Sartorius</td>
			<td>BBI-8541701</td>
			<td>0.4-0.6mm diameter&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Mini BeadBeater</td>
			<td>BioSpec</td>
			<td colspan="2">Mini BeadBeater 16</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Guanidinium</td>
			<td>Sigma</td>
			<td>G4505</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Avidin</td>
			<td>Sigma</td>
			<td>A9275</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Streptavidin Beads</td>
			<td>GE Healthcare&#160;</td>
			<td>17-5113-01</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Bovine serum albumin (BSA)</td>
			<td>Sigma</td>
			<td>A7906</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Yeast tRNA</td>
			<td>Sigma</td>
			<td>R8508</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Biotin</td>
			<td>Sigma</td>
			<td>B4501</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Yeast extract</td>
			<td>Bacto</td>
			<td dir="LTR">288620</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">peptone</td>
			<td>Bacto</td>
			<td dir="LTR">211677</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Glucose</td>
			<td>Sigma</td>
			<td>G8270</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">1 x Phosphate-Buffered saline (PBS)</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">0.2 M NaOH</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">4 x Laemmli Sample Buffer (LSB)</td>
			<td></td>
			<td></td>
			<td>0.2 M Tris-Hcl pH 6.8, 8% SDS, 0.4 M DTT, 40% glycerol, 0.04% Bromophenol-Blue.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Hot phenol lysis buffer</td>
			<td></td>
			<td></td>
			<td>10 mM Tris pH 7.5, 10 mM EDTA, 0.5% SDS&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">3 M Sodium Acetate pH 5.2</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">100% and 70% Ethanol (EtOH)</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">RNase-free water</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;">RaPID lysis buffer</td>
			<td></td>
			<td></td>
			<td>20 mM Tris pH 7.5, 150 mM NaCl, 1.8 mM MgCl2, 0.5% NP-40, 5 mg/ml Heparin, 1 mM Dithiothreitol (DTT), 1 mM Phenylmethylsulfonyl Flouride (PMSF), 10 &#181;g/ml Leupeptin, 10 &#181;g/ml Aprotinin, 10 &#181;g/ml Soybean Trypsin Inhibitor, 10 &#181;g/ml Pepstatin, 20 U/ml DNase I, 100 U/ml Ribonuclease&#160; Inhibitor.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">2x Cross-linking reversal buffer</td>
			<td></td>
			<td></td>
			<td dir="LTR">100 mM Tris pH 7.4, 10 mM EDTA, 20 mM DTT, 2 % SDS.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">RaPID wash buffer</td>
			<td></td>
			<td></td>
			<td>20 mM Tris-HCl pH 7.5,&#160; 300 mM NaCl, 0.5% NP-40</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">0.5 M EDTA pH 8</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Silver Stain Plus Kit</td>
			<td>Bio-Rad&#160;</td>
			<td>161-0449</td>
			<td>For detecting proteins in polyacrylamide gels</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">SD selective medium&#160;</td>
			<td></td>
			<td></td>
			<td>1.7 g/l Yeast nitrogen base with out amino acids and ammonium sulfate, 5 g/l Ammonium sulfate, 2% glucose, 350 mg/l Threonine, 40 mg/l Methionine, 40 mg/l Adenine, 50 mg/l Lysine, 50 mg/l Tryptophan, 20 mg/l Histidine, 80 mg/l Leucine, 30 mg/l Tyrosine, 40 mg/l Arginine</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Anti-eEF3 (EF3A,YEF3)</td>
			<td colspan="2">Gift from Kinzy TG. (UMDNJ Robert Wood Johnson Medical School)</td>
			<td>1:5,000</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Anti GFP antibody</td>
			<td>Santa Cruz</td>
			<td>sc-8334</td>
			<td>1:3,000</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Anti rabbit IgG-HRP conjugated</td>
			<td>SIGMA</td>
			<td>A9169</td>
			<td>1:10,000</td>
		</tr>
	</tbody>
</table>

novel rna-binding proteins isolation by the rapid methodology

RNA-binding proteins (RBPs) play important roles in every aspect of RNA metabolism and regulation. Their identification is a major challenge in modern biology. Only a few in vitro and in vivo methods enable the identification of RBPs associated with a particular target mRNA. However, their main limitations are the identification of RBPs in a non-cellular environment (in vitro) or the low efficiency isolation of RNA of interest (in vivo). An RNA-binding protein purification and identification (RaPID) methodology was designed to overcome these limitations in yeast and enable efficient isolation of proteins that are associated in vivo. To achieve this, the RNA of interest is tagged with MS2 loops, and co-expressed with a fusion protein of an MS2-binding protein and a streptavidin-binding protein (SBP). Cells are then subjected to crosslinking and lysed, and complexes are isolated through streptavidin beads. The proteins that co-purify with the tagged RNA can then be determined by mass spectrometry. We recently used this protocol to identify novel proteins associated with the ER-associated PMP1 mRNA. Here, we provide a detailed protocol of RaPID, and discuss some of its limitations and advantages.

RaPID ermöglicht die Isolierung einer spezifischen Ziel-RNA mit seinen assoziierten Proteinen. Kritisch für den Erfolg hält die RNA intakt, so viel wie möglich, wodurch eine ausreichende Menge der Proteine ​​zu erhalten. Um die Isolation Effizienz und Qualität der RNA, Northern - Analyse durchgeführt (Abbildung 1A) bestimmen. Die Northern-Analyse hat den Vorteil, unmittelbar auf die Effizienz und die Qualität der raschen Meldung. Somit können die relativen Me...

Watch this Scientific Journal Video about Novel RNA-Binding Proteins Isolation by the RaPID Methodology at JoVE.com

Novel RNA-Binding Proteins Isolation by the RaPID Methodology

RNA-protein interactions lie at the heart of many cellular processes. Here, we describe an in vivo method to isolate specific RNA and identify novel proteins that are associated with it. This could shed new light on how RNAs are regulated in the cell.

Neuartige RNA-bindende Proteine ​​Isolation durch die rasche Methodik

RNA-binding proteins (RBPs) play important roles in every aspect of RNA metabolism and regulation. Their identification is a major challenge in modern ...

The overall goal of this procedure is to efficiently isolate specific RNA with proteins that are associated with the RNA in vivo. This method can help answer key questions in RNA metabolism and regulation, such as what is a distinct set of fau-bee-pees bound to a particular transcript. The main advantage of this technique is the high efficiency of isolation, which allows follow up identification of noble mRNA associated proteins.The rapid methodology utilizes a yeast strain that co-expresses MS2-tagged MRNA and a fusion protein of an MS2 binding protein and a streptavadin binding protein. Grow 500 milliliters of yeast cells at 30 degrees Celsius in synthetic dextrose or SD selective medium to an OD600 of 0.8 to 1.0. When the cells are ready, centrifuge at 3000 times G for 4 minutes at room temperature and discard the supernatant.Wash the cells in PBS and centrifuge again. Discard the supernatant and re-suspend the cells in an equal volume of SD without methionine. Incubate for 45 to 60 minutes at 30 degrees celcius to induce expression of the fusion protein.After 45 to 60 minutes, set aside 10 milliliters of the cells for RNA extraction and use the remaining cells for rapid purification. To begin this procedure, add to the cells 1.35 milliliters of 37%formaldehyde, to a final concentration of 0.1%to cross-link the RNA-protein complexes. Continue incubating at 30 degrees Celsius for 10 minutes.To stop cross-linking, add 26.5 milliliters of 2.5 molar glycine, to a final concentration of 0.125 molar, and incubate at 30 degrees Celsius for 3 minutes. From here on, keep everything on ice and work quickly to minimize RNA degradation. Centrifuge the cells at 3000 times G for 4 minutes at 4 degrees Celsius.Discard the supernatant, add 45 milliliters of cold PBS, and centrifuge again. Remove the supernatant and re-suspend the cells in 5 milliliters of rapid lysis buffer that contains a high concentration of Rnase inhibitors. Divide the cell suspension into aliquots of 500 microliters in screw-capped microfuge tubes and add approximately 400 milligrams of chilled glass beads to each aliquot.Lyse the cells in a bead-beater for three minutes. Immediately put the lysate on ice. Transfer the lysate to new microfuge tubes.Cut the top off a 5 milliliter syringe and put it on an empty 15 milliliter tube to serve as an adapter for screw-cap tubes. Use a hot needle to pierce a small hole in the bottom of each tube and place them on top of the adapted 15 milliliter tubes. Centrifuge the tub assemblies at 3000 times G for one minute at 4 degrees Celsius to elute the lysate to the 15 milliliter tubes.Transfer the flowthrough from each 15 milliliter tube to a new 1.5 milliliter tube and centrifuge at 10, 000 times G for 10 minutes at 4 degrees Celsius to clear the cell debris. Pool the supernatant from all 1.5 milliliter tubes into a single 15 milliliter tube. Set aside 1/50th and 1/100th volume of the lysate for RNA and protein isolation respectively.Begin the rapid procedure for isolating RNA protein complexes by adding 300 micrograms of Avidin to the cell lysate. Incubate for 30 minutes at 4 degrees Celsius under constant rolling. While the cell lysate is being incubated with Avidin, pre-wash the streptavidin beads, transfer about 300 microliters of the streptavadin bead slurry to weigh 1.5 milliliters microcentriuge tube, centrifuge the preparation, and then remove the upper supernatant which will result in 250 microliters of beads.Add 1 milliliter of rapid lysis buffer to the beads and centrifuge at 660 times G for 2 minutes at 4 degrees Celsius. Remove the supernatant and wash again with rapid lysis buffer. To block the beads, add 0.5 milliliters of rapid lysis buffer, 0.5 milliliters of BSA, and 10 microliters of yeast TRNA and incubate for 1 hour at 4 degrees Celsius with constant rotation.Wash the beads twice with 1 milliliter of rapid lysis buffer. Add 250 microliters of the pre-washed streptavidin beads to the avidin containing lysate and incubate for 1 hour at 4 degrees Celsius with constant rotation. This incubation time is a compromise between providing sufficient binding time and minimizing the chances for RNA degradation.After one hour, centrifuge at 660 times G for 2 minutes at 4 degrees Celsius to clear the streptavidin beads. Transfer the supernatant to a 15 milliliter tube. Set aside 1/50th and 1/100th volume of the lysate for RNA and protein isolation respectively.Add 1 milliliter of rapid lysis buffer to the beads. Mix by pipetting, transfer to a new 1.5 milliliter microcentrifuge tube and centrifuge at 660 times G for 2 minutes at 4 degrees Celsius. Wash three more times with rapid lysis buffer.After the final wash with rapid lysis buffer, remove the supernatant, add 1 milliliter of rapid wash buffer, and rotate for 5 minutes at 4 degrees Celsius. Centrifuge and wash 2 more times with rapid wash buffer. Wash the beads with 1 milliliter of PBS and centrifuge as before.Remove the supernatant, add to the beads 120 microliters of PBS, and rotate for 5 minutes in a roller. Centrifuge as before and collect all the supernatant for RNA and protein extraction as the wash sample. To elute RNA and RNA-associated proteins, add 120 microliters of 6 millimolar biotin in PBS to the beads, and incubate for 45 minutes at 4 degrees Celsius with constant rotation.Centrifuge the beads and transfer the eluded material to a new 1.5 milliliter tube. Spin the eluted sample again and transfer the upper phase to a new 1.5 milliliter tube to ensure no carry-over of beads. Take samples for RNA or protein extraction.To determine the isolation efficiency and quality of RNA, Northern Analysis was performed for two tagged RNAs. PMP1 and FPR1, from cast cell lysis, rapid cell lysis, and after elution with biotin. Ribosomal RNAs were detected by ethidium bromide staining, and the lack of ribosomal RNAs in the elution sample indicates the stringency of purification.The stringency and specificity of the purification are further demonstrated by the lack of a signal of an untagged MRNA in the elution samples. The apparent signal in the FPR1 lane, which is not of the size of ACT1, is a leftover from previous hybridization with the MS2L probe. Although the input RNA is somewhat more degraded compared to the RNA that was purified by the Hot Phenol protocol, a significant amount of full length tagged RNA is isolated specifically, as revealed by the strong signal in the elution fractions.Protein samples can be analyzed by SDS-PAGE and silverstaining prior to proteomics analysis. The MS2-CP-GFP-SBP fusion protein, indicated by the arrow, demonstrates equal protein loading. The asterisks indicate bands with differential intensities that were later cut out of the gel for mass-spectrometry analysis.While attempting this procedure, it's important to wear gloves, ensure a clean work-area, prepare solution with RNA free water, and work quickly and efficiently to reduce protocol time. Don't forget that working with reagents like phenol and formaldehyde can be extremely hazardous, and precautions such as working in a chemical hood should always be taken while performing this procedure. After watching this video, you should have a good understanding of how to efficiently and effectively purify RNA of fayn-tress and its associated body.Following this procedure, other methods like RNA-Seq can be performed in order to detect RNAs that bind the transcript of interest.

Research

JoVE Journal

Genetics

Conjugative Mating Assays for Sequence-specific Analysis of Transfer Proteins Involved in Bacterial Conjugation

Konjugative Mating Assays für sequenzspezifische Analyse der Übertragung beteiligten Proteine ​​in bakteriellen Konjugation

The transfer of genetic material by bacterial conjugation is a process that takes place via complexes formed by specific transfer proteins. In Escherichia ...

Forschung

Genetik

Kinetics of Lagging-strand DNA Synthesis In Vitro by the Bacteriophage T7 Replication Proteins

Kinetics of Lagging-strand DNA Synthesis In Vitro by the Bacteriophage T7 Replication Proteins

Kinetik der Verzögerungs-DNA-Synthese<em&gt; In Vitro</em&gt; Von den Bakteriophagen T7 Replikationsproteine

Here we provide protocols for the kinetic examination of lagging-strand DNA synthesis in vitro by the replication proteins of bacteriophage T7. The T7 ...

Bidirectional Retroviral Integration Site PCR Methodology and Quantitative Data Analysis Workflow

Bidirektionale Retrovirale Integrationsstelle PCR Methodik und quantitative Datenanalyse Workflow

Integration Site (IS) assays are a critical component of the study of retroviral integration sites and their biological significance. In recent retroviral ...

A Standard Methodology to Examine On-site Mutagenicity As a Function of Point Mutation Repair Catalyzed by CRISPR/Cas9 and SsODN in Human Cells

Eine Standardmethodik, vor-Ort-Mutagenität als Funktion der Punktmutation Reparatur katalysiert durch CRISPR/Cas9 und SsODN in den menschlichen Zellen zu untersuchen

Combinatorial gene editing using CRISPR/Cas9 and single-stranded oligonucleotides is an effective strategy for the correction of single-base point ...

Methodology for Accurate Detection of Mitochondrial DNA Methylation

Methodik für die präzise Erkennung der mitochondrialen DNA-Methylierung

Quantification of DNA methylation can be achieved using bisulfite sequencing, which takes advantage of the property of sodium bisulfite to convert ...

Novel Sequence Discovery by Subtractive Genomics

Neue Sequenz Entdeckung durch subtraktive Genomics

Subtractive genomics can be used in any research where the goal is to identify the sequence of a gene, protein, or general region that is embedded in a ...

Sequencing of mRNA from Whole Blood using Nanopore Sequencing

Sequenzierung von mRNA aus Vollblut mit Nanopore-Sequenzierung

Sequencing in remote locations and resource-poor settings presents unique challenges. Nanopore sequencing can be successfully used under such conditions, ...

Mass Spectrometry-Based Proteomics Analyses Using the OpenProt Database to Unveil Novel Proteins Translated from Non-Canonical Open Reading Frames

Massenspektrometrie-basierte Proteomics Analysen mithilfe der OpenProt-Datenbank zu enthüllen neue Proteine übersetzt aus dem nicht-kanonischen Open Reading Frames

Genome annotation is central to today's proteomic research as it draws the outlines of the proteomic landscape. Traditional models of open reading frame ...

An Assay for Quantifying Protein-RNA Binding in Bacteria

Ein Assay zur Quantifizierung der Protein-RNA-Bindung in Bakterien

In the initiation step of protein translation, the ribosome binds to the initiation region of the mRNA. Translation initiation can be blocked by binding ...

Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins

Erkundung des Sequenzraums zur Identifizierung von Bindungsstellen für regulatorische RNA-bindende Proteine

Gene regulation plays an important role in all cells. Transcriptional, post-transcriptional (or RNA processing), translational, and post-translational ...

Neuartige RNA-bindende Proteine ​​Isolation durch die rasche Methodik

Neuartige RNA-bindende Proteine Isolation durch die rasche Methodik