Name: the chrop approach combines chip and mass spectrometry to dissect locus-specific proteomic landscapes of chromatin
Uploaded: 2014-04-11T21:00:00
Description: Watch this Scientific Journal Video about The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin at JoVE.com

Questa ricerca è stato originariamente pubblicato in Mol Proteomica cellulari. Soldi M. Bonaldi T. La Proteomica Indagine della cromatina domini funzionali rivela Nuove sinergie tra distinte Eterocromatina Componenti MCP. 2013; 12: 64-80. © Società Americana per la Biochimica e Biologia Molecolare. Ringraziamo Roberta Noberini (Istituto Italiano di Tecnologia e IEO, Italia) per la lettura critica del manoscritto. Lavoro TB è sostenuto da finanziamenti della Fondazione Armenise-Harvard Career Development Program Giovanni, l&#39;Associazione Italiana per la Ricerca sul Cancro e il Ministero della Salute italiano. Lavoro MS è stato sostenuto da una borsa di studio FIRC.

1. Colture Cellulari <ol><li> Mezzo standard per ChIP nativo <ol><li> Crescere cellule HeLa in modificata medio Dulbecco di Eagle (DMEM) supplementato con 10% siero fetale bovino (FBS), 1% glutammina, 1% Pen / Strep e 10 mM HEPES pH 7.5. </li></ol></li><li> Etichettatura SILAC di reticolazione ChIP <ol><li> Crescere cellule HeLa in SILAC DMEM, impoverito di lisina e arginina, integrati con il 10% dializzato FBS, 1% glutammina, 1% Pen / Strep, 10 mM HEPES pH 7.5 e sia la luce L-lisina ...

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Abbiamo recentemente descritto ChroP, una strategia quantitativa per la caratterizzazione su larga scala dei componenti proteici della cromatina. ChroP combina due approcci complementari utilizzati in campo epigenetico, Chip e MS, approfittando loro punti di forza e superando i rispettivi limiti. ChIP accoppiato al sequenziamento profondo (ChIP-Seq) consente la mappatura genoma di modificazioni degli istoni alla risoluzione di alcune nucleosomi 35. Pur vantaggiosa per la loro sensibilità, saggi basati su ant...

Cromatina è un complesso nucleoproteina altamente dinamico che è coinvolto come modello primario per tutti i processi di DNA-mediata. Il nucleosoma è l&#39;unità ripetuta di base della cromatina e costituito da un nucleo octameric proteica contenente due molecole di ciascun istone H2A canonica, H2B, H3 e H4, attorno al quale 147 bp di DNA sono avvolte 1,2. Tutti gli istoni fondamentali sono strutturati come un dominio globulare e flessibile N-terminale &quot;coda&quot; che sporge al di fuori del nucleosoma. Uno dei principali meccanismi di regolazione della struttura della cromatina e la dinamica si basa su covalenti modificazioni post-traduzionali (PTM), che si verificano principalmente sulla N-terminali degli istoni 3,4. Modificazioni degli istoni possono funzionare alterando la struttura superiore ordine cromatina, cambiando contatti tra istoni-DNA o tra nucleosomi, e controllando così l&#39;accessibilità di DNA-binding proteine ​​(meccanismi cis), o agendo come DockInSiti g di proteine ​​regolatrici, sia come unità singole o incorporati in complessi multimerici. Tali proteine ​​regolatrici possono esercitare la loro funzione in modi diversi: modulando direttamente l&#39;espressione genica (pe proteine ​​TAF), o alterando il posizionamento nucleosoma (cioè cromatina rimodellamento complessi) o modificando altri residui istoni (ad esempio proteine ​​con metil-transferasi o acetil- attività transferasi) (meccanismi trans) 5. L&#39;osservazione che distinto PTM modelli cluster alla specifica loci cromatina portato all&#39;elaborazione della ipotesi che diverse modifiche al sito di distinte possono sinergizzare per generare un codice molecolare mediare lo stato funzionale del DNA sottostante. Il &quot;codice dell&#39;istone ipotesi&quot; ha ottenuto grandi consensi negli anni, ma la sua verifica sperimentale è stata frenata da limiti tecnici 6,7. Proteomica basati su spettrometria di massa (MS) è emerso come unpotente strumento per mappare i modelli modificazione degli istoni e caratterizzare-cromatina proteine ​​che legano 8. MS rileva un cambiamento come Δmass specifico tra la massa sperimentale e teorica di un peptide. A livello di singoli istoni, MS fornisce un metodo imparziale e completa per mappare PTM, consentendo l&#39;individuazione di nuove modifiche e il loro concatenamento rivelando tra loro 9-14. Negli ultimi anni, una serie di strategie sono state sviluppate per sezionare la composizione proteomica di cromatina, compresa la caratterizzazione della intatte cromosomi mitotici 15, l&#39;identificazione di solubili Hptm-binding proteins 16-18 e l&#39;isolamento e l&#39;analisi di specifiche regioni della cromatina (ossia telomeri) 19,20. Tuttavia, l&#39;indagine delle sinergie specifico locus tra PTM degli istoni, le varianti, e proteine ​​della cromatina associate è ancora incompleto. Qui, descriviamo un nuovo approccio, denominato ChroP (CHRO matin P roteomics) 21, che abbiamo sviluppato per caratterizzare in modo efficiente i domini di cromatina funzionalmente distinte. Questo approccio si adatta immunoprecipitazione della cromatina (ChIP), un protocollo ben consolidata utilizzati nella ricerca epigenetica, per l&#39;efficace analisi proteomica basata su MS del campione arricchito. Abbiamo sviluppato due protocolli diversi, a seconda del tipo di cromatina utilizzato come ingresso e la domanda indirizzata da MS; in particolare: 1) circuito integrato di unfixed cromatina nativa digerito con MNase è impiegato per purificare mono-nucleosomi ed a sezionare le hPTMs co-associano (N-ChroP); 2) circuito integrato di cromatina reticolato frammentata mediante sonicazione è usato in combinazione con una strategia basata intergenomica SILAC-caratterizzare tutti co-arricchimento proteine ​​(X-ChroP) vincolante cromatina. Illustriamo qui la combinazione di N-e X-ChroP per l&#39;arricchimento e lo studio eterocromatina, utilizzando H3K9me3 come esca per i passi immunoprecipitazione. L&#39;uso di ChroP può essere estesostudiare sia le regioni distinte su cromatina, o cambiamenti nella composizione della cromatina all&#39;interno della stessa regione durante la transizione a uno stato funzionale diversa, aprendo così la strada a varie applicazioni in epigenetica.

<table border="0" cellpadding="0" cellspacing="0" width="702">
	<tbody>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">DMEM&#160;</td>
			<td style="width:145px;">Lonza</td>
			<td style="width:119px;">BE12-614F</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">FBS</td>
			<td style="width:145px;">Invitrogen</td>
			<td style="width:119px;">10270-106</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">SILAC DMEM</td>
			<td style="width:145px;">M-Medical</td>
			<td style="width:119px;">FA30E15086</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">Dialyzed FBS</td>
			<td style="width:145px;">Invitrogen</td>
			<td style="width:119px;">26400-044</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">Lysine 0 (12C6 14N2 L-lysine)</td>
			<td style="width:145px;">Sigma Aldrich</td>
			<td style="width:119px;">L8662</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">Arginine 0 (12C6 14N4 L-arginine)</td>
			<td style="width:145px;">Sigma Aldrich</td>
			<td style="width:119px;">A6969</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;">Lysine 8 (13C6 15N2 L-lysine)</td>
			<td style="width:145px;">Sigma Aldrich</td>
			<td>68041</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;">Arginine 10 (13C6 15N4 L-arginine)</td>
			<td style="width:145px;">Sigma Aldrich</td>
			<td>608033</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">Micrococcal Nuclease</td>
			<td style="width:145px;">Roche</td>
			<td style="width:119px;">10 107 921 001</td>
			<td></td>
		</tr>
		<tr height="53">
			<td height="53" style="height:53px;width:271px;">Complete, EDTA-free Protease Inhibitor Cocktail Tablets</td>
			<td style="width:145px;">Roche</td>
			<td style="width:119px;">04 693 132 001</td>
			<td></td>
		</tr>
		<tr height="63">
			<td height="63" style="height:63px;width:271px;">Spectra/Por 3 dialysis tubing, 3.5K MWCO, 18mm flat width, 50 foot length</td>
			<td style="width:145px;">Spectrumlabs</td>
			<td style="width:119px;">132720</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:271px;">QIAquick PCR purification kit</td>
			<td style="width:145px;">QIAGEN</td>
			<td style="width:119px;">28104</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:271px;">Anti-Histone H3 tri-methylated K9-ChIP grade</td>
			<td>Abcam</td>
			<td>ab8898</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;">Histone H3 peptide tri-methyl K9&#160;</td>
			<td>Abcam</td>
			<td style="width:119px;">ab1773</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;">Dynabeads Protein G</td>
			<td>Invitrogen</td>
			<td style="width:119px;">100.04D</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:271px;">NuPAGE Novex 4-12%&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; Bis-Tris Gel&#160;</td>
			<td>Invitrogen&#160;</td>
			<td>NP0335BOX</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;">Colloidal Blue Staining Kit</td>
			<td>Invitrogen&#160;</td>
			<td>LC6025</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;">LDS Sample Buffer</td>
			<td>Invitrogen&#160;</td>
			<td>NP0007</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">Formaldheyde</td>
			<td style="width:145px;">Sigma Aldrich</td>
			<td style="width:119px;">F8775</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">Aceti anhydride-d6</td>
			<td style="width:145px;">Sigma Aldrich</td>
			<td style="width:119px;">175641-1G</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">Formic Acid</td>
			<td style="width:145px;">Sigma Aldrich</td>
			<td style="width:119px;">94318-50ML-F</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:271px;">Iodoacetamide &#8805;99% (HPLC), crystalline</td>
			<td style="width:145px;">Sigma Aldrich</td>
			<td style="width:119px;">I6125</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">DL-Dithiothreitol</td>
			<td style="width:145px;">Sigma Aldrich</td>
			<td style="width:119px;">43815</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:271px;">Sequencing Grade Modified Trypsin, Frozen 100ug (5 &#215; 20&#956;g)</td>
			<td>Promega</td>
			<td style="width:119px;">V5113</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">Nanospray OD 360&#956;m x ID 75&#956;m, tips ID 8&#956;m uncoated Pk 5</td>
			<td style="width:145px;">Microcolumn Srl</td>
			<td style="width:119px;">FS360-75-8-N-5-C15</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:271px;">&#160; ReproSil-Pur 120 C18-AQ, 3 &#181;m&#160;&#160; 15 % C</td>
			<td style="width:145px;">Dr. Maisch GmbH</td>
			<td style="width:119px;">r13.aq.</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">C18 extraction disk, 47 mm</td>
			<td style="width:145px;">Agilent Technologies</td>
			<td style="width:119px;">1&#8203;2&#8203;1&#8203;4&#8203;5&#8203;0&#8203;0&#8203;4</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">Carbon extraction disk, 47 mm</td>
			<td style="width:145px;">Agilent Technologies</td>
			<td style="width:119px;">12145040</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;width:271px;">Cation extraction disk</td>
			<td style="width:145px;">Agilent Technologies</td>
			<td style="width:119px;">66889-U</td>
			<td></td>
		</tr>
	</tbody>
</table>

the chrop approach combines chip and mass spectrometry to dissect locus-specific proteomic landscapes of chromatin

Cromatina è un complesso nucleoproteina altamente dinamico fatto di DNA e proteine ​​che controlla vari processi DNA-dipendente. Struttura della cromatina e la funzione in regioni specifiche è regolato dalla arricchimento locale della istone post-traslazionale modifiche (hPTMs) e varianti, proteine ​​della cromatina vincolanti, compresi fattori di trascrizione, e la metilazione del DNA. La caratterizzazione proteomica di composizione cromatina in corrispondenza di zone funzionali distinti è stata finora ostacolata dalla mancanza di protocolli efficienti per arricchire tali domini alla purezza e quantità appropriata per la successiva analisi approfondita da spettrometria di massa (MS). Descriviamo qui una strategia proteomica cromatina di nuova concezione, denominato ChroP (cromatografia matin P roteomics), per cui un immunoprecipitazione della cromatina preparativa è utilizzato per isolare le regioni della cromatina distinte le cui caratteristiche, in termini di hPTMs, varianti e co-associati proteine ​​non istoniche, sono analizzati da MS. Illustriamo luire la creazione di ChroP per l&#39;arricchimento e l&#39;analisi delle regioni heterochromatic trascrizionalmente silenti, caratterizzato dalla presenza di tri-metilazione della lisina 9 su istone H3. I risultati ottenuti dimostrano il potenziale di ChroP in fondo caratterizzare il proteoma eterocromatina e dimostrare come una strategia analitica potente per comprendere come i determinanti proteici distinti di cromatina interagiscono e sinergizzare stabilire configurazioni strutturali e funzionali specifici locus.

Cromatina immunoprecipitazione è una potente tecnica utilizzata per profilare la localizzazione di una proteina o una modificazione degli istoni lungo il genoma. In un equivalente di proteomica, ChIP è seguito da proteomica basati su MS per identificare qualitativamente e quantitativamente le hPTMs, varianti istoniche e proteine ​​della cromatina vincolanti che sono immunoprecipitati con la modifica o la proteina di interesse, utilizzati come &quot;esca&quot;. Nell&#39;approccio N-ChroP, illustrato in Figu...

Watch this Scientific Journal Video about The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin at JoVE.com

The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin

Combinando nativa e reticolazione cromatina immunoprecipitazione con alta risoluzione di Spettrometria di Massa, l&#39;approccio ChroP permette di sezionare il composito dell&#39;architettura proteomica delle modificazioni degli istoni, le varianti e le proteine ​​non istoniche Synergizing a domini di cromatina funzionalmente distinte.

L&#39;approccio ChroP Combina ChIP e Spettrometria di Massa a sezionare Locus-specifiche proteomica Paesaggi della cromatina

Chromatin is a highly dynamic nucleoprotein complex made of DNA and proteins that controls various DNA-dependent processes. Chromatin structure and ...

Research

JoVE Journal

Biology

MALDI Sample Preparation: the Ultra Thin Layer Method

MALDI Preparazione del campione: il metodo ultra sottile strato

This video demonstrates the preparation of an ultra-thin matrix/analyte layer for analyzing peptides and proteins by Matrix-Assisted Laser Desorption ...

Ricerca

Biologia

A Quantitative Assessment of The Yeast Lipidome using Electrospray Ionization Mass Spectrometry

Una valutazione quantitativa del Lipidome lievito con ionizzazione Electrospray Spettrometria di massa

Lipids are one of the major classes of biomolecules and play important roles membrane dynamics, energy storage, and signalling1-4. The budding yeast ...

Chromatin Immunoprecipitation (ChIP) to Assay Dynamic Histone Modification in Activated Gene Expression in Human Cells

Chromatin Immunoprecipitation ChIP to Assay Dynamic Histone Modification in Activated Gene Expression in Human Cells

Immunoprecipitazione della cromatina (ChIP) per analisi modifica dinamica Histone nell&#39;espressione genica attivata nelle cellule umane

In response to a variety of extracellular ligands, the STAT (signal transducer and activator of transcription) transcription factors are rapidly recruited ...

Chromatin Immunoprecipitation (ChIP) using Drosophila tissue

Chromatin Immunoprecipitation ChIP using Drosophila tissue

Immunoprecipitazione della cromatina (ChIP) con Drosophila Tessuto

Epigenetics remains a rapidly developing field that studies how the chromatin state contributes to differential gene expression in distinct cell types at ...

Profiling Thiol Redox Proteome Using Isotope Tagging Mass Spectrometry

Profiling tiolo Proteome Redox Utilizzando tag spettrometria di massa isotopica

Pseudomonas syringae pv. tomato strain DC3000 not only causes bacterial speck disease in Solanum lycopersicum but also on Brassica species, as well as on ...

A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry

A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry

Un nuovo approccio per l&#39;analisi comparativa dei multiproteico Complessi Basato su<sup&gt; 15</sup&gt; N metabolica Etichettatura e quantitativa Spettrometria di Massa

The introduced protocol provides a tool for the analysis of multiprotein complexes in the thylakoid membrane, by revealing insights into complex ...

Capture Compound Mass Spectrometry - A Powerful Tool to Identify Novel c-di-GMP Effector Proteins

Capture spettrometria di massa Compound - un potente strumento per identificare nuovi c-di-GMP effettori Proteine

Considerable progress has been made during the last decade towards the identification and characterization of enzymes involved in the synthesis ...

Selected Reaction Monitoring Mass Spectrometry for Absolute Protein Quantification

Reazione selezionato Monitoraggio spettrometria di massa per Absolute Protein Quantificazione

Absolute quantification of target proteins within complex biological samples is critical to a wide range of research and clinical applications. This ...

Amplification, Next-generation Sequencing, and Genomic DNA Mapping of Retroviral Integration Sites

Amplificazione, sequenziamento di prossima generazione, e DNA genomico mappatura dei siti di integrazione retrovirali

Retroviruses exhibit signature integration preferences on both the local and global scales. Here, we present a detailed protocol for (1) generation of ...

Identification of MyoD Interactome Using Tandem Affinity Purification Coupled to Mass Spectrometry

Identificazione di MyoD Interattoma Utilizzando Tandem Affinity Purification accoppiato alla spettrometria di massa

Skeletal muscle terminal differentiation starts with the commitment of pluripotent mesodermal precursor cells to myoblasts. These cells have still the ...