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Mod Spec

質量分析計によるヒストン修飾定量解析

Mod Spec® は、質量分析計を使って80種類以上の異なるヒストン修飾の相対量を一度に解析する手法です. Mod Spec® は、エピジェネティックな変化が疾患や薬物処理に応答して生じているかどうかを判断するための出発点になります。多くの修飾変化を一度に見出すことで、予想された変化の確認だけでなく、予期しない重要な変化などを発見できることも期待できます。

紹介チラシはこちらから

ヒストン修飾変化の解析例:

  • エピジェネティックな阻害剤への反応
  • 正常細胞と罹患細胞の比較
  • Knock-out 細胞 や動物細胞
  • 薬剤処理した移植サンプル
  • ヒト生検サンプル

What our customers are saying about us ...

"While working on the molecular mechanism of an epigenetic drug, we outsourced Mod Spec® to Active Motif in order to get a broader overview of the drug-induced changes of histone modifications. Overall, we were very pleased with the quality of the service, the kept timeline and last but not least, the fair price. We found surprising things that were not on our radar before."
Matthias Lauth, PhD
Phillips University
Marburg, Germany
Learn More >

 

プロセス

細胞ペレットや組織をActive Motif にお送りいただければ、ヒストンの抽出、サンプル調製を行い、Thermo Scientific™ TSQ Quantum Ultra™ Triple-Stage Quadrupole Mass Spectrometerにて分析を行います. すべてのサンプルは、トリプリケートで解析し、理解しやすい形のデータに変換してお渡しいたします。通常は、サンプルを受領後4-6週間で結果をお知らせいたします。

必要なサンプル量

  • 細胞: 2 - 5 million
  • 組織: 25 - 100 mg

Mod Spec® 受託解析の見積もり依頼Services Request Button


Histone modifications detected by Mod Spec®
H1.4: K25UN *H3R2UN: K4ME2 H3: Q55ME1 H3.3: K27AC
H1.4: K25AC *H3R2UN: K4ME3 H3: K56UN H3.3: K27M
H1.4: K25ME1 H3R2UN: Q5UN H3: K56AC H3.3: K27ME1
H1.4: K25ME2 H3R2UN: Q5ME1 H3: K56ME1 H3.3: K27ME2
H1.4: K25ME3 H3: K9UN H3: K64UN H3.3: K27ME3
^H2A: K5UN H3: K9AC H3: K64AC H3.3: K36UN
^H2A: K5AC H3: K9ME1 H3: K79UN H3.3: K36AC
^H2A: K9UN H3: K9ME2 H3: K79AC H3.3: K36ME1
^H2A: K9AC H3: K9ME3 H3: K79ME1 H3.3: K36ME2
^H2A: K36UN H3: K14UN H3: K79ME2 H3.3: K36ME3
^H2A: K36AC H3: K14AC H3: K79ME3 H4: K5UN
^H2A1: K13UN H3: K18UN H3: K122UN H4: K5AC
^H2A1: K13AC H3: K18AC H3: K122AC H4: K8UN
^H2A1: K15UN H3: K18ME1 H3.1: K27UN H4: K8AC
^H2A1: K15AC H3: Q19UN H3.1: K27AC H4: K12UN
^H2A1: K15UB H3: Q19ME1 H3.1: K27ME1 H4: K12AC
^H2A3: K13UN H3: K23UN H3.1: K27ME2 H4: K16UN
^H2A3: K13AC H3: K23AC H3.1: K27ME3 H4: K16AC
^H2A3: K15UN H3: K23ME1 H3.1: K36UN H4: K20UN
^H2A3: K15AC H3: R42UN H3.1: K36AC H4: K20AC
^H2A3: K15UB H3: R42ME2 H3.1: K36ME1 H4: K20ME1
*H3R2UN: K4UN H3: R49UN H3.1: K36ME2 H4: K20ME2
*H3R2UN: K4AC H3: R49ME2 H3.1: K36ME3 H4: K20ME3
*H3R2UN: K4ME1 H3: Q55UN H3.3: K27UN  

 

^ Multiple H2A isoforms may contribute to the signal for modifications on H2A.

* H3R2me2 and H3K4me2/3 are mutually exclusive modifications. H3R2 methylation prevents H3K4 methylation. Therefore, H3K4 modifications  are reported only on the H3R2 unmodified peptide. For more information, see Nature. 2007 Oct 18; 449(7164):933-7.

H3.2 may contribute to signals for modifications labeled H3.1.

 
Name Cat No. 価格 (税抜)  
Mod Spec® 25085 Request Quote
Mod Spec<sup>®</sup> data from control HeLa cells and HeLa cells treated for 7 days with 0.5uM GSK-126
Figure 1: Mod Spec® data from control HeLa cells and HeLa cells treated for 7 days with 0.5uM GSK-126.(Click image to enlarge)

GSK126 is an inhibitor that blocks the methytransferase activity of EZH2, resulting in global decreases in H3K27me2 and H3K27me3. A) A selection of H3 modifications are shown from Active Motif’s Mod Spec® assay that confirm significant decreases in H3K27 methylation with concomitant increases in acetylated and unmodified H3K27 (highlighted in yellow). Changes at H3K36 were also detected (highlighted in red). B) A selection of H4 modifications do not show significant changes in response to GSK126 treatment.

 

EZH2 inhibition results in decreased H2K27me3 levels
Figure 2: Mod Spec® data from control HEK293 cells and HEK293 cells treated for 6 hours with 5 mM sodium butyrate (NaB).

NaB is a general HDAC inhibitor and treatment is expected to increase histone acetylation levels. A) Mod Spec® data for a selection of acetylated and unmodified histone sites is shown. Acetylation is increased at all sites after treatment. Unmodified peptide is displayed for some sites and shows a concomitant decrease after NaB treatment. B) Methylation at various histone residues is not affected by NaB treatment.

 

How does Mod Spec® work?

  1. Histones are extracted from samples.
  2. Derivatization of histones using propionic anhydride.
    • Mass spectrometry of proteins requires digestion of the proteins into small peptides before being injected into the mass spectrometer. However, if peptides are too small they can not be separated in the LC step and if too big they are too complex to analyze. The most common method of digestion is with trypsin, an enzyme that cleaves proteins at lysine and arginine residues. This presents a problem when analyzing histones since histone tails are rich in lysine, resulting in digested peptides that are too small. Propionylation, using propionic anhydride, blocks cleavage at lysines while allowing digestion at arginines to occur. The resulting peptides are of the appropriate size for mass spec analysis.
  3. Histones are digested with trypsin.
  4. Samples are analyzed on a Triple-Stage Quadrupole Mass Spectrometer.
    • Peptides of the appropriate molecular weight are selected.
    • Peptides are further fragmented in the collision chamber.
    • Peptides fragments of interest are selected and analyzed by mass spectrometry.
  5. Fragments are analyzed and graphed to show changes between samples.
How does Mod Spec™ work?