Global phosphoproteomic profiling reveals distinct signatures in B-cell non-Hodgkin lymphomas
Ontology highlight
ABSTRACT:
INSTRUMENT(S): LTQ Orbitrap XL
ORGANISM(S): Homo Sapiens (human)
SUBMITTER: 
Damian Fermin
PROVIDER: PXD000658 | Pride | 2014-01-09
REPOSITORIES: Pride
Publications
Global phosphoproteomic profiling reveals distinct signatures in B-cell non-Hodgkin lymphomas.
Rolland Delphine D Basrur Venkatesha V Conlon Kevin K Wolfe Thomas T Fermin Damian D Nesvizhskii Alexey I AI Lim Megan S MS Elenitoba-Johnson Kojo S J KS
The American journal of pathology 20140322 5
Deregulation of signaling pathways controlled by protein phosphorylation underlies the pathogenesis of hematological malignancies; however, the extent to which deregulated phosphorylation may be involved in B-cell non-Hodgkin lymphoma (B-NHL) pathogenesis is largely unknown. To identify phosphorylation events important in B-NHLs, we performed mass spectrometry-based, label-free, semiquantitative phosphoproteomic profiling of 11 cell lines derived from three B-NHL categories: Burkitt lymphoma, fo ...[more]
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2014-04-28 | PXD000505 | Pride
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2014-04-28 | PXD000504 | Pride
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2020-06-12 | PXD019098 | Pride
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Samples were incubated overnight at 4°C with rotation, followed by addition of ChIP Grade Protein G Magnet Beads (Catalog #: 9006, Cell Signaling Technology) and incubation for 2 h at 4o C with rotation. The beads were washed a total of four times, including three low salt washes followed by one high salt wash for 5 mins/wash at 4o C (SimpleChIP protocol #9003, Cell Signaling Technology). Immunoprecipitated chromatin was eluted from the beads with 150 ul of 1X ChIP Elution Buffer for 30 mins at 65o C in a thermomixer. To reverse crosslinks, 6 ul of 5M NaCl and 2 ul of 20 ug/ul Proteinase K were added to the chromatin followed by incubation at 65o C overnight. DNA was purified according to SimpleChIP protocol #9003, Cell Signaling Technology. q-PCR. To check the success of the chromatin immunoprecipitation, input and ChIP’ed DNA samples were amplified with SYBR Green PCR Master Mix (Applied Biosystems) on a 7900HT Fast Real-Time PCR System. Primer sets corresponding to Hox9a and actin genes were used as positive controls for both histone and RNA polymerase II IP’s. (see Supplementary Table X for primer sequences). Library construction, amplification and sequencing. Loaded fixed volume of total eluate. Library construction was performed on a NuGEN instrument using the protocol and reagents outlined in the Ovation SP Ultralow Library Systems kit. Libraries were then enriched via PCR. After amplification, DNA was measured. A fixed amount of the total measured DNA was used for sequencing in an Illumina Hiseq2000 instrument to obtain single read data. High-throughput sequencing and read mapping. Libraries for Illumina sequencing of the samples were prepared using the the protocol and reagents outlined in the Ovation SP Ultralow Library Systems kit , NuGen Mondrian SP+ (NuGEN, San Carlos, CA) . Samples were sequenced using an Illumina HiSeq2000, obtaining 1- by 50-bp reads.
2016-07-01 | GSE79573 | GEO
Project description:Proteomic analysis of pervanadate-induced tyrosine-phosphorylated proteins in hepatocellular carcinoma WRL 68 cells Protein tyrosine phosphorylation plays critical roles in modulating biological processes such as cellular proliferation, differentiation, migration, apoptosis and metabolism. To profile tyrosine phosphorylated (pTyr) proteins as well as search novel pTyr proteins as cross-talk points among different cellular pathways, we developed a rapid and efficient approach to identify cellular pTyr proteins and their complexes by a combination of subcellular proteomics approach with signal transduction strategies. Human hepatocytic cells from WRL68 cell line were treated with pervanadate (POV), subfractionated into four fractions and then subjected to immunoaffinity purification with anti-pTyr antibody. The eluted mixtures of the anti-pTyr purification were identified by LC-MS/MS. Subcellular fractionation and affinity purification of tyrosine-phosphorylated proteins: WRL68 cells were first grown to 80% confluence in MEM complete medium and then the medium replaced with serum free media. After 15 h, the cells were either untreated or stimulated with 0.1 mM pervanadate (1 mM sodium orthovanadate, 3 mM H2O2) for 10 min. 150-mm cultures of WRL 68 cells were rinsed twice with 4? PBS and then scraped from the dish in 750?l of hypotonic buffer (10 mM Tris, 1 mM NaF, 10 mM IAA, pH 7.5) containing a cocktail of protein inhibitors. After a 20-min incubation on ice, the cells were passed about five times through a 25-g needle. The resulting lysate was subjected to a 15min centrifugation at 1000 rpm at 4?, after which the pellet was resuspended in 250?l of hypotonic buffer and re-extracted by a second round of the trituration and centrifugation. The supernatants of the first and second spins were combined, adjusted to 0.25 M NaCl, and separated into cytosolic (supernatant) and membrane (pellet) fractions bycentrifugation at 19,000 rpm (43,000 g) for 90 min at 4?. All the pellets and total cell lysate were resuspended in RIPA buffer (50 mM Tris-HCl, 150 mM NaCl, 1% Triton X-100, 0.1% SDS, 1% deoxycholic acid sodium) containing 1mM pervanadate with a cocktail of protein inhibitors with sonication aid. Cleared cell lysates were incubated overnight at 4? with 30?l monoclonal anti-phosphotyrosine-agrose (Sigma). Precipitated immune complexes were washed three times with 1×HNTG (20 mM HEPES, 150 mM NaCl, 0.1% Triton X-100, 10% Glycerol, pH 7.5) and then eluted with 100 mM phenyl phosphate (Sigma) in lysis buffer at 4?. Enzyme digestion, mass spectrometry and protein identification: The sample was digested according to the published method. Chromatography was performed using a surveyor LC system (Thermo Finnigan,SanJose,CA) on C18 reverse phase column(RP, 180 µm x 150 mm, BioBasic® C18, 5 µm, Thermo Hypersil-Keystone). The pump flow rate is split 1:100 for a colum flow rate of 1.5 µL/min.The column effluent is directly electrosprayed using the orthogonal metal needle source without further splitting.Mobile phase A is 0.1% formic acid in water,and the B mobile phase is 0.1% formic acid in acetonitrile. The separation of peptides obtained by enzymatic digest of bile sample was achieved with a gradient of 2-80% B over 360 min.The column effluent from the reverse phase column was analyzed by LCQ Deca XP ion-trap mass spectrometer.The micro-electrospray interface uses a 30 µm metal needle that is orthogonal to the inlet of the LCQ.The mass spectrometer was set that one full MS scan was followed by three MS/MS scans on the three most intense ion from the MS spectrum with the following Dynamic Exclusion™ settings: repeat count, 1; repeat duration, 0.5 min; exclusion duration, 3.0 min. The acquired MS/MS spectra were automatically searched against protein database for human proteins (SWISS-PROT/TrEMBL) using the TurboSEQUEST program in the BioWorks™ 3.0 software suite. An accepted SEQUEST result had to have a ?Cn score of at least 0.1 (regardless of charge state) and Xcorr (one charge?1.5, two charges?2.0, three charges?2.5). Single peptides that alone identify a protein were manually validated after meeting the above criteria. Bioinformatics analysis: The pI and MW of the proteins were analyzed using ExPASy proteomics tools accessed from http://cn.expasy.org/tools/#proteome. The grand average hydropathicity (GRAVY) values were determined according to Kyte-Doolittle. The protein subcellular location annotation was from SwissProt &TrEMBL protein database (http://us.expasy.org/sprot/). The protein function family was categorized according to Gene Ontology (GO) annotation terms extracted by InterPro (http://www.ebi.ac.uk./interpro/). The annotation of protein phosphorylation was from SwissProt &TrEMBL protein database (http://us.expasy.org/sprot/) and PhosphoSite (http://www.phosphosite.org). The kinases were annotated according to human kinome. Keywords: other
2005-04-07 | GSE2408 | GEO
Project description:Human primary macrophages were infected with influenza A virus (H3N2/Udorn strain, HA 256) for 6 hrs or left untreated. Cells were collected and lysed with HEPES lysis buffer (50 mM HEPES, 150 mM NaCl, 1 mM EDTA, 1 % NP-40, pH 7.4) including protease and phosphatase inhibitor cocktails. The cell lysates were centrifuged and the supernatant was collected and the protein content was measured with Bio-Rad DC™ protein assay (Bio-Rad). The proteins were reduced, alkylated, and enzymatically digested in-solution with trypsin. The digestion was stopped by adding FA (final c = 1 %). The samples were centrifuged 9168 x g for 10 min and desalted with Sep-Pak Vac RP C18 cartridges (Waters, MA, USA), following fractionation by strong cation exchange chromatography (SCX). The peptides were separated on a 200 x 4.6 mm, 5 μm, 200 Å PolySULFOETHYL A™ column (PolyLC, USA). The fractions were vacuum centrifuged and desalted as before, following phosphopeptide-enrichment with PHOS-Select™ Iron Affinity Gel (Sigma Aldrich, MO, USA). LC-MS/MS was performed with a Q Exactive hybrid quadrupole-orbitrap tandem mass spectrometer coupled to an EASY-nLC 1000 nanoflow liquid chromatograph (Thermo Fisher Scientific). A 100 μm x 3 cm trap column and a 75 μm x 15 cm analytical column were in-house packed with Magic C18AQ resin (200 Å, 5 μm; Michrom Bioresources). The mobile phases were 2% acetonitrile, 0.2% formic acid (A) and 95% acetonitrile, 0.2% formic acid (B). LC gradient elution condition was 2% B (0 min), 20% B (70 min), 40% B (100 min), and then 100% B (105-110 min), with a flow rate of 300 nl/min. Data dependent acquisition was performed in positive ion mode. MS spectra were acquired from m/z 300 to m/z 2000 at a resolution of 70,000 at m/z 200 with a target value of 1,000,000 and maximum injection time of 120 ms. The 10 most abundant precursor ions of which charge states were 2+ or higher were selected for higher energy collisional dissociation (HCD) with an isolation window of 2 and normalized collision energy of 30. MS/MS spectra were acquired at a resolution of 17,500 at m/z 200 with a target value of 50,000, maximum injection time of 250 ms, and the lowest mass fixed at m/z 100. Dynamic exclusion duration was 30 s.
2016-08-08 | PXD001620 | Pride
Project description:Female Sprague-Dawley rats were randomly separated into two groups: i) trained (Ex group) and ii) sedentary (Cont group). Animals from the Ex group were adapted to treadmill exercise for two consecutive weeks, involving a gradual increase in the running time till 60 min/day at 20 m/min, 0% grade, 5 days/week. This exercise program remained constant until the end of the 54 weeks. Mitochondria isolation from 10 animals (5 Ex group and 5 Cont group) was performed using the conventional methods of differential centrifugation. Mitochondrial protein extracts were reduced with dithiothreitol, alkylated with iodoacetamide and digested with trypsin using the FASP procedure (18). Briefly, each sample was solubilized in 4 % SDS, 0.1 M DTT, 0.1 M HEPES and incubated for 30 min at 60 C. Then, samples were mixed with 0.2 mL of a solution of 8 M Urea, 0.1 M HEPES, pH 8.5 (UH solution), loaded into the filtration devices (3k Microcon, Millipore), centrifuged at 14,000 g for 20 min, and washed twice with UH solution. After centrifugation, the concentrates were alkylated with 50 mM iodoacetamide in UH solution (dark, 25 C, 20 min), and washed twice with UH solution. The concentrate was diluted with 0.1 mL of 50 mM ammonium bicarbonate (ABC) and digested overnight (37 C) with the addition of 2 ug of trypsin diluted in 30 uL of 50 mM ABC. The resulting tryptic peptides were collected by centrifugation and the filter were washed twice with 50 uL of 50 mM ABC. Eluted peptides were acidified with 10 uL of formic acid and cleaned up on a homemade Empore C18 column (3M, St. Paul, MN, USA) (ref) for subsequent phospho-enrichment and/or analysis by LC-MS/MS. The dried protein digest was dissolved with 10 uL (3 % ACN, 0.1 % TFA), diluted 1:5 with loading buffer (1 M glycolic acid, 5 % TFA, 80 % ACN) and phosphopeptides were enriched on TiO2-beads as previously described (19). Briefly 5 mg of "Titansphere TiO2 5 um" were suspended in 100 uL of 100 % ACN, immobilized in a pipette-column and washed using 5 uL of loading buffer. Each sample was loaded in each pipette-column and then washed with 30 uL of washing buffer (1 % TFA, 80 % ACN). Phosphopeptides were eluted from the beads with 25 uL of 25 % ACN (v/v) containing 25 % NH4OH (m/v), acidified with 10 uL of 10 % TFA and vacuum- concentrated to approximately 4 uL. Samples were finally diluted to 10 uL with H2O + 0.1% formic acid prior to injection. The peptides mixtures were analyzed by online nanoflow liquid chromatography tandem mass spectrometry (nanoLC-MS/MS) on an EASY-nLC system (Proxeon Biosystems, Odense, Denmark) connected to the LTQ Orbitrap Velos instrument (Thermo Fisher Scientific, Bremen, Germany) through a nanoelectrospray ion source. Six microliters of the peptide mixture were auto-sampled directly onto the analytical HPLC column (120 mm x75 um I.D., 3 um particle size (Nikkyo Technos Co., Ltd.) with a 120-min gradient from 5 % to 50 % ACN in 0.1 % FA. The effluent from the HPLC column was directly electrosprayed into the mass spectrometer. The LTQ Orbitrap Velos instrument was operated in data-dependent acquisition mode to automatically switch between full scan MS and MS/MS acquisition. The MS survey scan was performed in the FT cell recording a window between 350 and 2000 m/z. The resolution was set to 60 000, and the automatic gain control was set to 1,000,000 ions with a maximal acquisition time of 400 ms. The 20 most intense peptide ions with charge states great than or equal to 2 were sequentially isolated to a target value of 5,000 and fragmented in the high-pressure linear ion trap by low-energy CID with normalized collision energy of 35% Q value of 0.25, and an activation time of 10 ms. Raw files were processed using Proteome Discoverer version 1.3 (Thermo Fisher Scientific, Bremen). Peak lists were searched using Mascot software version 2.3 (Matrix Science, UK) against a SwissProt database containing entries corresponding to Rattus norvegicus (version of July 2012), a list of common contaminants, and all the corresponding decoy entries. Trypsin was chosen as enzyme and a maximum of two miscleavages were allowed. Carbamidomethylation (C) was set as a fixed modification, whereas oxidation (M) and phosphorylation (STY) were used as variable modifications. Searches were performed using a peptide tolerance of 7 ppm, a product ion tolerance of 0.5 Da. Resulting data files were filtered for FDR less than 1 % at peptide level.
2014-02-14 | PXD000354 | Pride
Project description:MicroPoly(A)Pure kits (Ambion) were used to prepare mRNA from P. salmonis-infected and control Atlantic salmon head kidney. Head kidney mRNA samples were prepared from pooled (n = 10) infected or control kidney. Approximately 200 ng of infected or control head kidney mRNA was used as template in aRNA synthesis reactions. Two infected head kidney samples were pooled to yield 8.9 ug of aRNA, and a single control head kidney sample contained 8.4 ug of aRNA. Infected and control head kidney aRNA samples were visualized on agarose gels to check quality and quantity (data not shown). Except for the amounts of aRNA and reverse transcription (RT) primer used, head kidney target labeling reactions and microarray hybridizations were identical. Head kidney target syntheses used 2 ug of aRNA and 2 ug of random primers (Roche). RT primers were mixed with aRNA samples, and nuclease-free H2O (Invitrogen) was added to make 10 ul total volume. Samples were incubated at 70 degrees C for 4 min, then placed on ice. RT reactions included 50 mM Tris HCl pH 8.3, 75 mM KCl, 3 mM MgCl2, 10 mM DTT, 0.5 mM each dATP, dCTP, and dGTP, 0.2 mM dTTP, 0.05 mM Cy3-dUTP or Cy5-dUTP (Amersham), 40U RNAguard ribonuclease inhibitor (Amersham), and 400U Superscript II Rnase H- reverse transcriptase (Invitrogen). RT reactions were incubated at 42 degrees C for 2.5 h, followed by addition of 0.025U RNase A (Sigma) and 1.5U RNase H (New England BioLabs) and incubation at 37 degrees C for 30 min. Labeled targets were cleaned using the Qiaquick PCR purification kit (Qiagen) and precipitated, with 300 mM sodium acetate, 1 ul of 20 ug/ul glycogen (Invitrogen), and 2.5 volumes of 100% ethanol, at -20 degrees C overnight. Each labeled target was recovered by centrifugation (14,000 rpm, 4 degrees C, 1 h), washed in 70% ethanol, air-dried, and resuspended in 60 ul of hybridization buffer: 50% deionized formamide, 5X SSC, 0.1% SDS, 5 ul of 5 ug/ul oligo dT (5’T18[Q-N]3’), 5 ul of 2 ug/ul BSA (Pierce), and 2 ul of 10 ug/ul sonicated human placental DNA (Sigma). Targets were incubated at 96 degrees C for 3 min, and then at 65 degrees C until applied to microarrays. Microarrays were prepared for hybridization by washing 2 X 5 min in 0.1% SDS, washing 5 X 1 min in MilliQ H2O, immersing 3 min in 95 degrees C MilliQ H2O, and drying by centrifugation (2000 rpm, 5 min, in 50 ml conical tube). Microarray hybridizations were run in the dark under HybriSlips hybridization covers (Grace Biolabs) in slide hybridization chambers (Corning) submerged in a 45 degrees C water bath for 16 h. Coverslips were floated off in 45 degrees C (1X SSC, 0.2% SDS), and arrays were washed 1 X 10 min in 45 degrees C (1X SSC, 0.2% SDS), 3 X 4 min in room temperature (0.1X SSC, 0.1% SDS), and 4 X 4 min in room temperature 0.1X SSC. Slides were dried by centrifugation as before. Fluorescent images of hybridized arrays were acquired immediately at 10 um resolution using ScanArray Express (PerkinElmer). The Cy3 and Cy5 cyanine fluors were excited at 543 nm and 633 nm respectively, and the same laser power (90%) and photomultiplier tube (PMT) settings were used for all slides in a study (PMT 75 Cy3, PMT 63 or 64 Cy5 for head kidney study). Fluorescent intensity data were extracted from TIF images using Imagene 5.5 software (Biodiscovery). Keywords: other
2004-02-11 | GSE1031 | GEO
Project description:In mammals, the peptide hormone vasopressin controls renal water excretion, largely through its actions in the renal collecting duct to regulate the molecular water channel aquaporin-2 (AQP2). There are two modes of regulation: 1) short-term regulation by membrane trafficking; and 2) long-term regulation involving vasopressin-induced changes in the abundance of the aquaporin-2 protein. Defects in the long-term regulation have been implicated in multiple water balance disorders. With the objetive to identify genes that are transcriptionally regulated in response to vasopressin in cultured mouse collecting duct cells (mpkCCD), we carried out both RNA-seq to measure all transcripts (n=9) and ChIP-seq for RNA polymerase II (Polr2a) binding along the genome (n=3). Observations were made both after 24-hr treatment with the vasopressin analog dDAVP and with vehicle. Protocol:Confluent monolayers mpkCCD cells were washed in ice-cold 1X PBS (Ca+2/Mg+2-free) followed by cross-linking in 1.11% formaldehyde in Covaris Fixing Buffer (5.5 ml) for 5min at room temperature with gentle rocking (PN 520075, Covaris, Woburn, Massachusetts). Cross-linking was terminated by the addition of 0.3 ml of 1X Covaris Quenching Buffer with rocking. The buffer solution was aspirated and 1X ice-cold PBS was added to each plate. Cells were scraped into 15ml conical tubes, spun down (200 x g, 5 min), and washed twice with PBS. After the second wash, cell pellets were resuspended in 10 ml of 1X Covaris Lysis Buffer for 10 min at 4o C with rocking. Nuclei were pelleted by spinning at 1,700 x g for 5 min at 4o C. Nuclear pellets was resuspended in the 1X Covaris Wash Buffer and incubated for 10 mins at 4o C with rocking. Samples were spun at 1,700 x g for 5 min at 4o C. Nuclear pellets were washed twice with the Covaris Non-ionic Shearing Buffer and spun at 1,700 x g for 5 min at 4o C. Nuclei were resuspended in Covaris Non-ionic Shearing Buffer (Maximum of 1-3x 10^7cells per ml of buffer). Shearing. Two 20 ul aliquots of the resuspended pellets were removed prior to shearing to be used as subsequent unsheared controls for immunoblotting and agarose gel electrophoresis. The remaining samples were transferred to AFA tubes (TC12 x 12 mm) and volumes adjusted to 1 ml (V)). Samples were sheared using a Covaris S2 SonoLAB Single system for two minutes (Duty cycle: 5%; Intensity: 4; cycle: 200). Total nuclear protein concentration of each sample in mcg/ml (R) was determined with the BCA Protein Assay Kit (Thermo Scientific, Rockford, IL). To test shearing efficiency, a 20 ul aliquot from each tube was removed after shearing to test the efficacy of shearing. The aliquots, including the unsheared sample, were incubated with 100 ul 1X TE buffer, 10 ul 10% SDS, and RNAse A (10 ug/ul, Cell Signaling Technology, Danvers, Massachusetts) for 30 mins at 37o C. 1 ul proteinase K (20 ug/ul) was added and the samples were incubated overnight at 65o C. The DNA was purified using DNA Clean & Concentrator columns (Catalog #: D4013, Zymo Research, Irvine, CA) and ran on an E-gel EX 2% agarose (Invitrogen, Carlsbad, CA). Target fragment sizes for chromatin immunoprecipitation were in the range of 150-700 bp in length with average fragment size of 300 bp. Testing epitope integrity (immunoblotting). Total protein content was determined with the BCA Protein Assay Kit (Thermo Scientific, Rockford, IL). Samples were then diluted with sample buffer (5X Laemmli buffer) at 20% (v/v) of the entire sample volume. Proteins were resolved by SDS-PAGE (4-20% polyacrylamide gels, Criterion, Bio-Rad, Hercules, CA) and transferred electrophoretically onto nitrocellulose membranes as previously described (Hwang, 2010). Membranes were probed with anti-RNA polymerase II (Catalog #: MMS-126R, Covance). The antibody was used at a 1:500 dilution (anti-RNA polymerase II) (in Odyssey blocking buffer containing 0.1% Tween 20) overnight at 4°C. After 1-h incubation with secondary antibody (Li-Cor Biosciences 680 anti-rabbit immunoglobulin G or 800 anti-mouse immunoglobulin G; Lincoln, NE) at 1:5000 dilution, sites of antibody-antigen reaction were detected using an Odyssey infrared imager (Li-Cor). Chromatin immunoprecipitation. 10 ul of sample equivalent to 2% input was removed prior to IP. Chromatin Immunoprecipitation was performed using 30-90 ug of sheared chromatin in 500 uL of 1X Covaris Non-ionic Shearing Buffer with 10 μl anti-RNA polymerase II antibodies. Samples were incubated overnight at 4°C with rotation, followed by addition of ChIP Grade Protein G Magnet Beads (Catalog #: 9006, Cell Signaling Technology) and incubation for 2 h at 4o C with rotation. The beads were washed a total of four times, including three low salt washes followed by one high salt wash for 5 mins/wash at 4o C (SimpleChIP protocol #9003, Cell Signaling Technology). Immunoprecipitated chromatin was eluted from the beads with 150 ul of 1X ChIP Elution Buffer for 30 mins at 65o C in a thermomixer. To reverse crosslinks, 6 ul of 5M NaCl and 2 ul of 20 ug/ul Proteinase K were added to the chromatin followed by incubation at 65o C overnight. DNA was purified according to SimpleChIP protocol #9003, Cell Signaling Technology. q-PCR. To check the success of the chromatin immunoprecipitation, input and ChIPâ??ed DNA samples were amplified with SYBR Green PCR Master Mix (Applied Biosystems) on a 7900HT Fast Real-Time PCR System. Primer sets corresponding to Hox9a and actin genes were used as positive controls for both histone and RNA polymerase II IPâ??s. (see Supplementary Table X for primer sequences). Library construction, amplification and sequencing. Loaded fixed volume of total eluate. Library construction was performed on a NuGEN instrument using the protocol and reagents outlined in the Ovation SP Ultralow Library Systems kit. Libraries were then enriched via PCR. After amplification, DNA was measured. A fixed amount of the total measured DNA was used for sequencing in an Illumina Hiseq2000 instrument to obtain single read data. High-throughput sequencing and read mapping. Libraries for Illumina sequencing of the samples were prepared using the the protocol and reagents outlined in the Ovation SP Ultralow Library Systems kit , NuGen Mondrian SP+ (NuGEN, San Carlos, CA) . Samples were sequenced using an Illumina HiSeq2000, obtaining 1- by 50-bp reads. We combine RNA-seq and ChIP-seq to identify genes whose mRNA abundances change in tandem with changes in RNA polymerase II binding, as a mean to identify genes that are transcriptionally regulated in response to vasopressin. In addition, the pattern of RNA polymerase II binding along the gene provides important information about regulatory mechanisms. We identify two populations of genes regulated by vasopressin in mpkCCD cells, viz. 1) those with increases in transcript abundance and increases in RNA polymerase II binding throughout the gene body and; 2) genes that show increases in RNA polymerase II binding in the promotor proximal region but do not produce increases in transcript level. The former group is restricted to 35 genes and includes Aqp2. The latter group is made up of the majority of expressed genes and is presumably due to a widespread increase in transcriptional initiation without proportionate release of pausing.
2016-07-01 | E-GEOD-79573 | biostudies-arrayexpress
Project description:Plant Growth and Treatment. Seedlings of Arabidopsis thaliana GVG::FLAG-NtMEK2DD were grown in 50 ml of half-strength Murashige and Skoog medium at 22°C under continuous light (70 µE/m2/sec). Twelve-day-old seedlings were treated with DEX (1 µM) or ethanol (control) and collected 6 h after treatment. Protein Extraction and MOAC Enrichment of Phosphoproteins. Protein extraction from seedlings and enrichment of phosphoprotein. The concentration of protein in extracts was determined using the Bio-Rad protein assay kit with BSA as the standard. Western Blotting Analysis and Immunodetection. Protein samples were subjected to SDS-PAGE, transferred to nitrocellulose, and used for immunodetection. Mouse monoclonal anti-Flag M2 antibodies were purchased from Sigma-Aldrich; all other antibodies were from New England Biolabs. Chemiluminescence detection of antigen-antibody complexes was done with Immobilon™ Western substrate (Millipore). Enrichment of Phosphopeptides by MOAC. For in-solution protein digestion, total proteins or MOAC-enriched phosphoproteins were predigested for 5 h with endoproteinase Lys-C (1/100 w/w) followed by trypsin digestion (Poroszyme immobilized trypsin (1/100 v/w)) overnight. Protein digests were desalted using a SPEC C-18 96-well plate (Varian) according to the manufacturer’s instructions. TiO2 beads were purchased from Glygen Inc. Mass Spectrometry and Protein Identification. Peptides were analyzed using an Orbitrap XL mass spectrometer (Thermo Scientific). Chromatography was performed using a Chromolith CapRod C18 monolithic column with 0.1% (v/v) formic acid (FA) in ultrapure H2O and 0.1% (v/v) FA in 90% (v/v) acetonitrile (ACN) in ultrapure H20 as mobile phases and a gradient from 10% to 35% organic phase in 120 min with a flow rate of 500 nl/min. Multistage activation/pseudoMS3 was enabled for acquisition of CID tandem MS (MS/MS) mass spectra of phosphopeptides with a neutral loss mass list of 97.97, 48.999, 32.66 and 24.49 Da. Database search was performed with the Proteome Discoverer Software version 1.2. using the SEQUEST algorithm.
2012-12-11 | PXD000048 | Pride