Dataset Information

TMTpro-18plex analysis of HEK293T cells transfected with DCAF siRNAs

ABSTRACT: HEK293T cells transfected with control, CUL4, COP1, DCAF3, DCAF14, or RBBP7 siRNA were lysed in 150 µL guanidine buffer. After heating and sonication, the lysates were centrifuged at 20,000 × g for 15 min at 4°C. The supernatants were recovered, and proteins (150 µg each) were purified by methanol-chloroform precipitation and resuspended in 20 µL of 0.1% RapiGest SF (Waters) in 50 mM triethylammonium bicarbonate. After sonication and heating at 95 °C for 10 min, the proteins were digested with 1.5 µg trypsin/Lys-C mix (V5072, Promega) at 37°C overnight. The digested peptides (60 µg each) were labeled with 0.5 mg TMTpro-18plex reagent (A52047, Thermo Fisher Scientific) for 1 h at 25°C. After quenching the labeling reactions with hydroxylamine, all TMT-labeled samples were pooled, acidified with TFA, and fractionated using offline high-pH reversed-phase chromatography on a Vanquish DUO UHPLC system (Thermo Fisher Scientific). The peptides were loaded onto a 4.6 × 250 mm Xbridge BEH130 C18 column with 3.5-µm particles (Waters) and separated using a 30-min multistep gradient of solvents A (10 mM ammonium formate, pH 9.0 in 2% ACN) and B (10 mM ammonium formate, pH 9.0 in 80% ACN), at a flow rate of 1 mL/min. Peptides were separated into 48 fractions and consolidated into 16 fractions. Each fraction was evaporated using a SpeedVac concentrator and dissolved in 0.1% TFA and 3% ACN. LC-MS/MS analysis of the resulting peptides (500 ng each) was performed on an EASY-nLC 1200 UHPLC system connected to a Q Exactive Plus mass spectrometer using a nanoelectrospray ion source (Thermo Fisher Scientific). The peptides were separated on a 150-mm C18 reversed-phase column with an inner diameter of 75 µm at a linear gradient of 4–20% ACN for 0–160 min and 20–32% ACN for 160–220 min, followed by an increase to 80% ACN for 10 min, and finally held at 80% ACN for 10 min. The mass spectrometer was operated in data-dependent acquisition mode with the top 15 MS/MS methods. The MS1 spectra were measured at a resolution of 70,000, an AGC target of 3e6, and a mass range of 375–1,400 m/z. The HCD MS/MS spectra were triggered at a resolution of 35,000, AGC target of 1e5, isolation window of 0.7 m/z, maximum injection time of 100 ms, and a normalized collision energy of 33. Dynamic exclusion was set to 20 s. Raw data were directly analyzed against the SwissProt database restricted to Homo sapiens using Proteome Discoverer version 2.5 with the Sequest HT search engine for identification and TMT quantification. The search parameters were as follows: (a) trypsin as an enzyme with up to two missed cleavages, (b) precursor mass tolerance of 10 ppm, (c) fragment mass tolerance of 0.02 Da, (d) TMTpro of lysine and peptide N-terminus and carbamidomethylation of cysteine as fixed modifications, and (e) oxidation of methionine as a variable modification. The peptides were filtered through a percolator node at an FDR of 1%. TMT quantification was performed using a reporter ion quantifier node. Normalization was performed so that the total sum of the abundance values for each TMT channel for all peptides was the same.

ORGANISM(S): Homo Sapiens (human)

SUBMITTER: Hidetaka Kosako

PROVIDER: PXD057876 | JPOST Repository | Fri Nov 14 00:00:00 GMT 2025

REPOSITORIES: jPOST

ACCESS DATA

Dataset's files

Source:

			Action	DRS
	147_Yamanaka_HEK293_siRNA_TMTpro18_Vanquish16_1_QEp.raw	Raw
	149_Yamanaka_HEK293_siRNA_TMTpro18_Vanquish16_2_QEp.raw	Raw
	151_Yamanaka_HEK293_siRNA_TMTpro18_Vanquish16_3_QEp.raw	Raw
	153_Yamanaka_HEK293_siRNA_TMTpro18_Vanquish16_4_QEp.raw	Raw
	155_Yamanaka_HEK293_siRNA_TMTpro18_Vanquish16_5_QEp.raw	Raw

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Publications

An interactome-based framework for DDB1- and CUL4-associated factor prioritization in targeted protein degradation.

Yamanaka Satoshi S Nagaoka Koya K Shoya Yuki Y Nishino Kohei K Mikura Yumi Y Tanaka Kenshi K Konishi Keisuke K Hasegawa Yoshinori Y Hijikata Atsushi A Kosako Hidetaka H Sawasaki Tatsuya T

Molecular cell 20260401 7

The DDB1- and CUL4-associated factor (DCAF) family functions as substrate receptors within Cullin4-really interesting new gene (RING) ubiquitin ligases (CRL4s), facilitating proteasomal degradation of targeted substrates. Although CRL4-based targeted protein degradation (TPD) has emerged as a promising strategy to modulate undruggable proteins, the complex formation, substrates, and functional properties of many DCAFs remain poorly defined. In this study, using proximity biotinylation-based inte ...[more]

PMID: 41932313

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Project description:The experiment consists of M.hyp 232 cultures digests analyzed on two mass specs, LTQ Velos Pro and LTQ FT Ultra LTQ Velos Pro: Six cell culture replicates of M.hyo 232 were hydrophobically separated using tree detergents: Digitonin, Tween, and SDS. Each francion, including the insoluble pellet, was trypsin digested and then cleaned using an SCX trap follwed by a RP trap to remove detergents. Each fraction was sepated using a Dionex U3000 splitless nanoflow system operating at 333 nl per minute using a gradient of 2% ACN to 50% ACN in 4 hours. Eluate was analyzed using an LTQ Velos Pro mass spectrometer with 20 MS/MS scans of the 20 most intense peaks from each MS scan. Dynamic exclusion was enable for 3 minutes for each m/z with a repeat count of 1. LTQ FT Ultra: Two cell pellets for high resolution analysis were lysed and trypsin digested. Digested peptides were dried, resuspended in 20 mM KH2PO4, 20% ACN, pH 3 (Buffer A) in 2.5 µL and transferred to low retention vials in preparation for separation using an Ultimate 3000 configured for 2D-LC. Each sample was loaded at 15 µl/min onto an SCX microtrap for the first dimension of separation, involving SCX steps of Buffer A + 0, 5, 10, 15, 20, 25, 30, 40, 50, 100, 250, 500, and 1000 mM KCl. For the second dimension of separation, each eluted salt step was desalted with an inline peptide microtrap with 2% ACN, 0.1% FA at 5 µl/min. Once desalted, the microtrap was switched into line with a fritless nano column (75µm x ~10cm) containing C18 media (5µ, 200 Å Magic, Michrom). Peptides were eluted using a gradient of 2% to 36% ACN, 0.1% FA at 350 nl/min over 60 min and electrospray ionized for analysis using an LTQ FT Ultra mass spectrometer. A survey scan m/z 350-1750 was acquired in the FT ICR cell (Resolution = 100,000 at m/z 400, with an accumulation target value of 1,000,000 ions). Up to the 6 most abundant ions (>3,000 counts) with charge states > +2 were sequentially isolated and fragmented within the linear ion trap using collisionally induced dissociation with an activation q = 0.25 and activation time of 30 ms at a target value of 30,000 ions. M/z ratios selected for MS/ MS were dynamically excluded for 30 seconds. Analysis: X!tandem searches were performed using the Mycoplasma hyopneumoniae strain 232 reference protein set from NCBI. The only difference between the searches for the LTQ Velos and LTQ FT was the precursor mass tolenance being set to +-1500ppm and +-24ppm respectively. Decoy searches were performed and the data filtered at e-value <= 0.01 with single peptide proteins discarded. These results are included in the submission as two tab-delimited text files.

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.

Project description:Bacteria was grown at 30C in 3 different conditions, i.e. SYN (syngas and minimal medium- ATCC no 1789), AC (0.3% acetate in minimal medium- ATCC no 1789) and TSB (tryptic soy broth). After harvesting by centrifugation, O. carboxidovorans pellets (1g) were lysed in 100 mM Tris-Cl pH 8.0, 2% Triton X-100, 2.6 mg/ml sodium azide, 8 mM PMSF by sonication on ice (4 pulses of 15 s duration each). For each condition of growth 4 samples (1g pellets) were separately treated (i.e. lysed and processed further). The supernatants were treated with 50% cold TCA, and the precipitated protein washed with acetone. The pellets were resuspended in solubilization buffer (7M urea, 20 mM tris-Cl, pH 8.0, 5 mM EDTA, 5 mM MgCl2, 4% CHAPS), and protein concentration was determined using the Plus One 2-D Quant Kit (Amersham) following the manufacturers instructions. Protein samples from each treatment were stored at -80 C. One hundred micrograms of each protein sample was resuspended in 0.1 M ammonium bicarbonate, 5% HPLC grade ACN, reduced in 5 mM DTT (65 C, 5 min), alkylated in 10 mM iodoacetamide (30 C, 30 min), and then trypsin digested until there was no visible pellet (1:50 w/w 37 C, 16 h). Peptides were desalted using a peptide microtrap (Michrom BioResources, Auburn, CA) and eluted using a 0.1% TFA, 95% ACN solution. Desalted peptides were dried in a vacuum centrifuge and resuspended in 20 ?l of 0.1% formic acid. Peptides were separated by strong cation exchange (SCX) liquid chromatography (LC) followed by reverse phase (RP) LC coupled directly in line with electrospray ionization (ESI) tandem mass spectrometry (MS/MS). 2DLC ESI MS/MS was done exactly as described (1). All searches were done using TurboSEQUEST (Bioworks Browser 3.2; Thermo Electron). Mass spectra and tandem mass spectra were searched against all annotated proteins from the strain OM5 including all the annotated plasmid-encoded proteins. Cysteine carbamidomethylation and methionine oxidation (single and double) were included in the search strategy. We used the reverse database functionality in Bioworks 3.2 and searched MS2 data against a reversed OM5 database using identical search criteria.

Project description:Prefrontal cortex tissue slices from a cognitively and neurpathologically normal human subject were obtained from the University of Pennsylvania (UPenn) Brain Bank. 300-350 mg grey matter was homogenized in 1.5 ml solution A (0.32 M sucrose, 1mM MgCl2 and 0.1mM CaCl2) with a Teflon pestle. ~100 ?l of the homogenate was saved, solubilized with 1% SDS and clarified by centrifugation. To prepare the [13C6]brain ISTD, 400 mg labeled MouseExpress brain tissue (Cambridge Isotopes, MA) was homogenized in 4 ml buffer A as described above, centrifuged at 1,000 x g for 10 min to clarify, agitated on a rocker at 4�C for 30 min, and centrifuged at 10,000 x g for 20 min. The pellet, a crude membrane fraction, was dissolved in 2 ml 20 mM Tris pH 7.4 with 1% SDS. Total protein in all preparations was quantified with the micro BCA assay (Pierce) and all solutions were supplemented with protease and phosphate inhibitor cocktails (Sigma) as well as 1 mM sodium fluoride and sodium orthovanadate (Sigma). Human cortex homogenate was mixed with the [13C6]brain ISTD (1?g/?l) at a ratio of 2:1(?g/?g) and processed for LC-MS/MS: 40 ?l preparations were heated with lithium dodecyl sulfate (LDS) (Invitrogen) buffer at 95�C for 20 min, separated on a 1.5 mm 4-12% Bis-Tris Gel (Invitrogen), cut into five fractions, chopped into ?2 mm cubes, washed in 200 ?l 50% acetonitrile (ACN) containing 25 mM NH4HCO3, reduced in 300 ?l 10 mM DTT, alkylated in 300 ?l 55 mM iodoacetamide (Sigma), and digested with 80-120 ?l trypsin (.025 ?g/?l) (Promega) overnight at 37�C, so that the amount of trypsin was 1:5 of the total protein to be digested by mass. Peptides were recovered from gel cubes into 200 ?l 50/50 H2O/ACN with 3% formic acid by vortex-mixing and sonication for 20 min each, twice. Samples were then evaporated to a 100 ?l volume, brought to 1ml in H20 with 0.1% formic acid, desalted with Oasis� HLB cartridges (Waters), evaporated almost to completion and suspended in ~ 45?l H2O with 0.1% formic acid, and filtered with 0.22 �m Ultra free-MC filter cartridges (Millipore). LC-data dependant -MS/MS analyses were conducted on a Q Exactive (ThermoFisher Scientific) quadrupole orbi-trap hybrid instrument with an Easy nLC-II (ThermoFisher Scientific) nano-pump/autosampler. 3?l peptide sample (~ 1 ug) was loaded and resolved on a 20 cm x 75 �m proteopepII C18 packed tip column over a 90 min gradient at a flow rate of 350 nL/min, 0-35% mobile phase B (ACN, 0.1 formic acid). A data-dependent top 10 method was used to acquire a 70,000 resolution full scan to trigger ten 17,500 resolution HCD scans. Ions were isolated for MS/MS analysis with a 2.0 Da window on the quadrupole. Average cycle times were 1.2 sec. Each sample was analyzed in triplicate. Raw files from triplicate injections were searched together within Proteome Discoverer 1.3 (ThermoFisher Scientific) using SEQUEST and the human refseq. database (release 47, ftp://ftp.ncbi.nih.gov/refseq/H_sapiens/mRNA_Prot/). Search parameters allowed trypsin to cleave after Lysine and Arginine and have 2 missed cleavages. Precursor ion mass tolerance was set to 15 ppm and fragment ion mass tolerance was 20 mmu. The dynamic modification of methionine (oxidation = 15.995 Da) and lysine (13C6 = 6.020 Da), in addition to the static modification of cysteine (carbamidomethylation = 57.021 Da) was accepted on up to 4 residues per peptide. Within the Proteome Discoverer Software, SILAC pairs were identified using the �2 plex� workflow node, and all peptides were rescored using the Percolator algorithm node. Finally, peptides were filtered at 1% false discovery rate (FDR).

Project description:NTERA-2 cells were treated with DMSO, 0.3 µM Po-P, 0.3 µM Le-P, 0.3 µM F-P, 0.3 µM Cl-P, or 0.3 µM F3C-P for 16 h in three biological replicates. The cells were lysed in 100 µL guanidine buffer (6 M guanidine-HCl, 100 mM HEPES-NaOH, pH 7.5, 10 mM TCEP, 40 mM chloroacetamide). After heating and sonication, proteins (100 µg each) were purified by methanol–chloroform precipitation and resuspended in 20 µL 0.1% RapiGest SF (Waters) in 50 mM triethylammonium bicarbonate. After sonication and heating at 95 °C for 10 min, the proteins were digested with 2 µg trypsin/Lys-C mix (Promega) at 37 °C overnight. The digested peptides (40 µg each) were labeled with 0.5 mg TMTpro-18plex reagents (Thermo Fisher Scientific) for 1 h at 25 °C. After the reaction was quenched with hydroxylamine, all the TMT-labeled samples were pooled, acidified with TFA, and fractionated by offline high-pH reversed-phase chromatography on a Vanquish DUO UHPLC (Thermo Fisher Scientific) as described previously. Briefly, the peptides were loaded onto a 4.6 × 250 mm Xbridge BEH130 C18 column with 3.5 mm particles (Waters) and separated using a 30 min multistep gradient of solvents A (10 mM ammonium formate at pH 9.0 in 2% ACN) and B (10 mM ammonium formate pH 9.0 in 80% ACN), at a flow rate of 1 mL/min. Peptides were separated into 48 fractions, which were consolidated into 16 fractions. Each fraction was evaporated in a SpeedVac concentrator and dissolved in 0.1% TFA and 3% ACN. LC-MS/MS analysis of the resultant peptides (500 ng each) was performed on an EASY-nLC 1200 UHPLC connected to a Q Exactive Plus mass spectrometer through a nanoelectrospray ion source (Thermo Fisher Scientific). The peptides were separated on the analytical column (75 μm × 15 cm, 3 μm; Nikkyo Technos) with a linear gradient of 4–20% for 0–115 min and 20–32% for 115–160 min, followed by an increase to 80% ACN for 10 min and finally held at 80% ACN for 10 min. The mass spectrometer was operated in data-dependent acquisition mode with a top 10 MS/MS method. MS1 spectra were measured with a resolution of 70,000, an AGC target of 3e6, and a mass range from 375 to 1,400 m/z. MS/MS spectra were triggered at a resolution of 35,000, an AGC target of 1e5, an isolation window of 0.7 m/z, a maximum injection time of 150 ms, and a normalized collision energy of 33. Dynamic exclusion was set to 20 s. Raw data were directly analyzed against the SwissProt database restricted to Homo sapiens using Proteome Discoverer version 2.4 with the Sequest HT search engine for identification and TMT quantification. The search parameters were as follows: (a) trypsin as an enzyme with up to two missed cleavages; (b) precursor mass tolerance of 10 ppm; (c) fragment mass tolerance of 0.02 Da; (d) TMT of lysine and peptide N-terminus and carbamidomethylation of cysteine as fixed modifications; (e) oxidation of methionine as a variable modification. Peptides were filtered at an FDR of 1% using the Percolator node. TMT quantification was performed using the Reporter Ions Quantifier node. Normalization was performed such that the total sum of the abundance values for each TMT channel over all peptides was the same.

Project description:MM1.S cells were treated with DMSO, 0.3 µM Po-P, 0.3 µM Le-P, 0.3 µM F-P, 0.3 µM Cl-P, or 0.3 µM F3C-P for 16 h in three biological replicates. The cells were lysed in 100 µL guanidine buffer (6 M guanidine-HCl, 100 mM HEPES-NaOH, pH 7.5, 10 mM TCEP, 40 mM chloroacetamide). After heating and sonication, proteins (100 µg each) were purified by methanol–chloroform precipitation and resuspended in 20 µL 0.1% RapiGest SF (Waters) in 50 mM triethylammonium bicarbonate. After sonication and heating at 95 °C for 10 min, the proteins were digested with 2 µg trypsin/Lys-C mix (Promega) at 37 °C overnight. The digested peptides (40 µg each) were labeled with 0.5 mg TMTpro-18plex reagents (Thermo Fisher Scientific) for 1 h at 25 °C. After the reaction was quenched with hydroxylamine, all the TMT-labeled samples were pooled, acidified with TFA, and fractionated by offline high-pH reversed-phase chromatography on a Vanquish DUO UHPLC (Thermo Fisher Scientific) as described previously. Briefly, the peptides were loaded onto a 4.6 × 250 mm Xbridge BEH130 C18 column with 3.5 mm particles (Waters) and separated using a 30 min multistep gradient of solvents A (10 mM ammonium formate at pH 9.0 in 2% ACN) and B (10 mM ammonium formate pH 9.0 in 80% ACN), at a flow rate of 1 mL/min. Peptides were separated into 48 fractions, which were consolidated into 16 fractions. Each fraction was evaporated in a SpeedVac concentrator and dissolved in 0.1% TFA and 3% ACN. LC-MS/MS analysis of the resultant peptides (500 ng each) was performed on an EASY-nLC 1200 UHPLC connected to a Q Exactive Plus mass spectrometer through a nanoelectrospray ion source (Thermo Fisher Scientific). The peptides were separated on the analytical column (75 μm × 15 cm, 3 μm; Nikkyo Technos) with a linear gradient of 4–20% for 0–115 min and 20–32% for 115–160 min, followed by an increase to 80% ACN for 10 min and finally held at 80% ACN for 10 min. The mass spectrometer was operated in data-dependent acquisition mode with a top 10 MS/MS method. MS1 spectra were measured with a resolution of 70,000, an AGC target of 3e6, and a mass range from 375 to 1,400 m/z. MS/MS spectra were triggered at a resolution of 35,000, an AGC target of 1e5, an isolation window of 0.4 m/z, a maximum injection time of 100 ms, and a normalized collision energy of 31. Dynamic exclusion was set to 20 s. Raw data were directly analyzed against the SwissProt database restricted to Homo sapiens using Proteome Discoverer version 2.4 with the Sequest HT search engine for identification and TMT quantification. The search parameters were as follows: (a) trypsin as an enzyme with up to two missed cleavages; (b) precursor mass tolerance of 10 ppm; (c) fragment mass tolerance of 0.02 Da; (d) TMT of lysine and peptide N-terminus and carbamidomethylation of cysteine as fixed modifications; (e) oxidation of methionine as a variable modification. Peptides were filtered at an FDR of 1% using the Percolator node. TMT quantification was performed using the Reporter Ions Quantifier node. Normalization was performed such that the total sum of the abundance values for each TMT channel over all peptides was the same.

Project description:MM1.S cells were treated with DMSO or 10 µM thalidomide or its derivatives for 5 h in two biological replicates. The cells were lysed in 200 µL guanidine buffer (6 M guanidine-HCl, 100 mM HEPES-NaOH, pH 7.5, 10 mM TCEP, 40 mM chloroacetamide). After heating and sonication, proteins (100 µg each) were purified by methanol–chloroform precipitation and resuspended in 20 µL 0.1% RapiGest SF (Waters) in 50 mM triethylammonium bicarbonate. After sonication and heating at 95 ºC for 10 min, the proteins were digested with 2 µg trypsin/Lys-C mix (Promega) at 37 ºC overnight. The digested peptides (40 µg each) were labeled with 0.5 mg TMTpro-18plex reagents (Thermo Fisher Scientific) for 1 h at 25 ºC. After the reaction was quenched with hydroxylamine, all the TMT-labeled samples were pooled, acidified with TFA, and fractionated by offline high-pH reversed-phase chromatography on a Vanquish DUO UHPLC (Thermo Fisher Scientific) as described previously. Briefly, the peptides were loaded onto a 4.6 × 250 mm Xbridge BEH130 C18 column with 3.5 µm particles (Waters) and separated using a 30 min multistep gradient of solvents A (10 mM ammonium formate at pH 9.0 in 2% ACN) and B (10 mM ammonium formate pH 9.0 in 80% ACN), at a flow rate of 1 mL/min. Peptides were separated into 48 fractions, which were consolidated into 16 fractions. Each fraction was evaporated in a SpeedVac concentrator and dissolved in 0.1% TFA and 3% ACN. LC-MS/MS analysis of the resultant peptides (500 ng each) was performed on an EASY-nLC 1200 UHPLC connected to a Q Exactive Plus mass spectrometer through a nanoelectrospray ion source (Thermo Fisher Scientific). The peptides were separated on the analytical column (75 μm × 15 cm, 3 μm; Nikkyo Technos) with a linear gradient of 4–20% for 0–115 min and 20–32% for 115–160 min, followed by an increase to 80% ACN for 10 min and finally held at 80% ACN for 10 min. The mass spectrometer was operated in data-dependent acquisition mode with a top 15 MS/MS method. MS1 spectra were measured with a resolution of 70,000, an AGC target of 3e6, and a mass range from 375 to 1,400 m/z. MS/MS spectra were triggered at a resolution of 35,000, an AGC target of 1e5, an isolation window of 0.7 m/z, a maximum injection time of 150 ms, and a normalized collision energy of 32. Dynamic exclusion was set to 20 s. Raw data were directly analyzed against the SwissProt database restricted to Homo sapiens using Proteome Discoverer version 2.5 with the Sequest HT search engine for identification and TMT quantification. The search parameters were as follows: (a) trypsin as an enzyme with up to two missed cleavages; (b) precursor mass tolerance of 10 ppm; (c) fragment mass tolerance of 0.02 Da; (d) TMT of lysine and peptide N-terminus and carbamidomethylation of cysteine as fixed modifications; (e) oxidation of methionine as a variable modification. Peptides were filtered at an FDR of 1% using the Percolator node. TMT quantification was performed using the Reporter Ions Quantifier node. Normalization was performed such that the total sum of the abundance values for each TMT channel over all peptides was the same.

Project description:Proteome quantification using TMT reagents and off-line basic peptide fractionation was done as described previously in Grand, 2021, with the exception that the isolated nuclei were used as a starting material rather than whole cells to enable detection of transcription factors which are generally less abundant proteins in the cell, and that nine channels from a TMTpro16 reagent kit were used. Briefly, mESCs, NGN2 24h induced cells and MyoD1 24h induced cells were harvested in triplicates of 10 million per sample. Nuclei were isolated by suspending in 4 ml of nuclear extraction buffer (10 mM HEPES pH 7.9, 10 mM KCl, 10 mM EDTA, 0.5% NP-40, 1 mM DTT and complete protease inhibitor (Roche)) and incubating on ice for 10 min with vortexing every 2 minutes. Nuclei were collected by centrifugation (800g, 10 min, 4 °C), washed with ice cold PBS and suspended in 1% sodium deoxycholate in 50 mM HEPES buffer (pH 8.5). The nuclear lysate was disrupted with sonication. Proteins were reduced, alkylated and Lys-C/trypsin digested. Fifty micrograms of peptides from each biological replicate were labelled using channels 128C-131C from a TMT 16plex isobaric labelling reagents kit (Lot# VJ313476, Thermo Fisher Scientific). Dried TMT-labeled peptides were dissolved in 20 μL of 10 mM ammonium formate (pH 10, high pH Buffer A), and high-pH reversed-phase chromatography was employed using an Agilent 1100 HPLC system with an autosampler, a YMC Triart C18 0.5 x 250 mm column, and a fraction collector. The peptides were separated using the following binary buffer system: high-pH Buffer A (20 mM ammonium formate in water, pH 10) and high-pH Buffer B (20 mM ammonium formate pH 10 in 90% acetonitrile) at a flow rate of 12 μL/minute. The gradient duration was a total of 115 min, with mobile phase compositions in %B as follows: 0-5 min at 2%-15%, 5-15 min at 15%-25%, 15-80 min at 25%-45%, 80-85 min at 45%-65%, 85-95 min at 65%-100%, 95-100 min at 100%, 100-101 min at 100%-2%, and 101-115 min at 2%, resulting in 48 fractions after sample concatenation. Samples were acidified with 1% TFA and dried in a speed vac. Peptides reconstituted in 2% acetonitrile, 0.1% formic acid were on-line separated on a C18 50 cm μPAC column using a EASYnLC-1000 system (all Thermo Fisher Scientific) mounted on a Digital PicoView nanospray source (New Objective), connected to an Orbitrap Fusion Lumos mass spectrometer (Thermo Fisher Scientific). Peptide elution was achieved using a linear gradient of increasing concentration of acetonitrile in 0.1% formic acid at a flow rate of 500 nl/min: 0-2 min: 2%, 2-8 min: 2-6%, 8-89 min 6-22%, 89-107 min: 22-40%, 107-111 min: 40-80%, 111-115 min: 80% (washing), 115-116 min: 80-2%, 116-120 min: 2% (equilibration). For MS data acquisition in a data-dependent mode, ions for survey MS1 scans were recorded in profile mode in the Orbitrap detector at a resolution of 120,000 in the range of 400-1400 m/z every 3 seconds for a maximum of 100 ms to reach the normalized AGC target of 50%. The most abundant precursors were selected in the quadrupole within an isolation window of 0.7 m/z for MS2 HCD fragmentation based on advanced peak determination, monoisotopic peak determination set to peptides, within charge states 2-8, dynamic exclusion of 60 s within +/-10 ppm tolerance for isotopes and different charge states, with a minimum intensity of 5e4, with normalized collision energy 34% for a maximum injection time of 200 ms to reach the normalized AGC target of 80%. MS2 HCD spectra were and recorded in the “normal” range, starting at 100 m/z at 50,000 resolution in the Orbitrap analyzer in centroid mode.