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EpiCypher——優(yōu)質(zhì)核小體的選擇

2024-04-19
瀏覽次數(shù): 54

越來(lái)越多的證據(jù)表明,核小體是體外表征許多染色質(zhì)調(diào)節(jié)因子的最佳底物。隨著攜帶完全確定組蛋白修飾的重組核小體的出現(xiàn),為下一代染色質(zhì)研究提供了新的或更好的方法(如染色質(zhì)結(jié)合蛋白分析、酶分析、抗體譜分析)。EpiCypher擁有令人印象深刻的產(chǎn)品目錄,其中包括83個(gè)獨(dú)特的重組核小體庫(kù)存,并且有能力生產(chǎn)定制設(shè)計(jì)核小體,質(zhì)量高、周期短,助力您的研究!

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在科研實(shí)驗(yàn)中,如果您要使用重組核小體進(jìn)行染色質(zhì)實(shí)驗(yàn),則需考慮以下幾點(diǎn):

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1、用于開(kāi)發(fā)修飾組蛋白的方法。確保使用無(wú)疤痕方法整合所需的PTMs是很重要的,這種方法可以重現(xiàn)天然組蛋白結(jié)構(gòu)。EpiCypher 使用幾種不同的方法獲得修飾的組蛋白,所有方法都會(huì)無(wú)疤痕整合組蛋白修飾。

為什么這很重要呢?許多市售的重組核小體是使用組蛋白PTM類似物構(gòu)建的,如甲基賴氨酸類似物(MLAs) 10,其會(huì)導(dǎo)致修飾位點(diǎn)的氨基酸序列發(fā)生變化。這些非天然組蛋白修飾類似物已被證明會(huì)破壞與染色質(zhì)調(diào)節(jié)蛋白和組蛋白PTM特異性抗體的相互作用,并且這對(duì)研究生理機(jī)制來(lái)講是不理想的。因此,使用這些方法合成的核小體時(shí)應(yīng)格外謹(jǐn)慎11-13。

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2、修飾組蛋白的純度。組裝完全定義的同質(zhì)核小體的下一步是對(duì)修飾組蛋白進(jìn)行嚴(yán)格的質(zhì)量控制。

在質(zhì)控結(jié)果中,HPLC 跡線應(yīng)顯示是單一洗脫物質(zhì),表明組蛋白純度>95%;平行高分辨率質(zhì)譜(HRMS)應(yīng)在預(yù)期質(zhì)量的1道爾頓范圍內(nèi)顯示一個(gè)單峰,沒(méi)有任何意義的額外電荷質(zhì)量(m/z)信號(hào)(例如圖2A)。EpiCypher的所有修飾組蛋白均通過(guò)HPLC和HRMS分析進(jìn)行驗(yàn)證。

為什么這很重要呢?不必要的物質(zhì)(如甲硫氨酸氧化)可能引起結(jié)構(gòu)改變,并影響靜電相互作用或疏水相互作用,從而損害下游核小體組裝的效率。

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EpiCypher——優(yōu)質(zhì)核小體的選擇

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3、組裝核小體的質(zhì)量控制(QC)指標(biāo)。DNA組裝后核小體的質(zhì)量驗(yàn)證對(duì)最終產(chǎn)品的信任保證至關(guān)重要。?

EpiCypher使用天然PAGE分析DNA上的dNuc組裝,其中使用約150bp DNA的高效組裝應(yīng)該只產(chǎn)生單一物質(zhì),這相對(duì)于未組裝的游離DNA,其遷移率降低(圖2B,下圖)。

為什么這很重要呢?因?yàn)楸晃廴镜挠坞xDNA會(huì)誘導(dǎo)染色質(zhì)修飾酶(如NSD2)的異?;钚裕员仨毐苊?。此外,次優(yōu)組裝可能導(dǎo)致樣品的異質(zhì)性混合,包括錯(cuò)誤定位的核小體。

我們還使用考馬斯染色對(duì)最終的dNucs進(jìn)行SDS-PAGE分析,以確保四種組蛋白的化學(xué)計(jì)量相等(圖2C,下圖)。然后,我們通過(guò)免疫印跡證實(shí)了整合組蛋白PTM的存在(圖2C,上圖)。

為什么這很重要呢?如果其他種類的蛋白質(zhì)污染或偏離1:1:1:1的比例,則可能表明組蛋白降解或組裝不良,因此有必要重新解析每個(gè)組蛋白。而免疫印跡對(duì)于確定修飾是否存在于組蛋白的正確位置上非常重要。

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核小體相關(guān)產(chǎn)品

分類

貨號(hào)

產(chǎn)品名稱

rNucs Human Recombinant?

Nucleosomes, No PTMs

16-0006

Mononucleosomes, biotinylated

16-0009

Mononucleosomes, non-biotinylated

16-0024

Mononucleosomes, desthiobiotinylated

16-0027

Tailless Nucleosomes, biotinylated

16-0023

Mononucleosomes, H3.1 ΔN2, biotinylated

16-0016

Mononucleosomes, H3.1 ΔN32, biotinylated

16-1016

Mononucleosomes, H3.1 ΔN32, non-biotinylated

16-0017

Mononucleosomes, H3.3 ΔN32, biotinylated

16-1017

Mononucleosomes, H3.3 ΔN32, non-biotinylated

16-0018

Mononucleosomes, H4 ΔN15, biotinylated

16-3004

Dinucleosomes, biotinylated

16-3104

Dinucleosomes, non-biotinylated




dNucs Designer Recombinant?

Nucleosomes with PTMs

16-0321

H3K4me1, biotinylated

16-0334

H3K4me2, biotinylated

16-1334

H3K4me2, non-biotinylated

16-0316

H3K4me3, biotinylated

16-1316

H3K4me3, non-biotinylated

16-0402

H3K4,K9me3, biotinylated

16-0403

H3K4,K27me3, biotinylated

16-0335

H3K4me3,K9,14,18ac, biotinylated

16-0325

H3K9me1, biotinylated

16-0324

H3K9me2, biotinylated

16-0315

H3K9me3, biotinylated

16-0338

H3K27me1, biotinylated

16-0339

H3K27me2, biotinylated

16-0317

H3K27me3, biotinylated

16-1317

H3K27me3, non-biotinylated

16-0397

H3.1K27me3,S28phos, biotinylated

16-0322

H3K36me1, biotinylated

16-0319

H3K36me2, biotinylated

16-0320

H3K36me3, biotinylated

16-1320

H3K36me3, non-biotinylated

16-0390

H3.3K36me3, biotinylated

16-0367

H3K79me1, biotinylated

16-0368

H3K79me2, biotinylated

16-0369

H3K79me3, biotinylated

16-0393

H4K12me1, biotinylated

16-0331

H4K20me1, biotinylated

16-0332

H4K20me2, biotinylated

16-0333

H4K20me3, biotinylated

16-1333

H4K20me3, non-biotinylated




vNucs Histone Variants

16-0013

H2AX, biotinylated

16-1013

H2AX, non-biotinylated

16-0366

H2AXS139phos, biotinylated

16-0014

H2AZ.1, biotinylated

16-1014

H2AZ.1, non-biotinylated

16-0015

H2AZ.2, biotinylated

16-0011

H3.3, biotinylated

16-0012

H3.3, non-biotinylated




Mutant Nucs Defined Amino?

Acid Substitutions

16-0029

H2AE61A, biotinylated

16-1029

H2AE61A, non-biotinylated

16-0030

H2AE92K, biotinylated

16-1030

H2AE92K, non-biotinylated

16-0031

H2BE105A,E113A, biotinylated

16-1031

H2BE105A,E113A, non-biotinylated

16-0349

Oncogenic Nucs (oncoNucs)

16-0350

H3.3K9M, biotinylated

16-1323

H3.3K27M, biotinylated

16-0323

H3.3K27M, non-biotinylated

16-0346

H3.3G34R, biotinylated

16-0347

H3.3G34V, biotinylated

16-0348

H3.3G34W, biotinylated

16-0344

H3.3K36M, biotinylated




Methyl DNA Nucs Nucleosomes?

with Methylated DNA

16-2043

Mononucleosomes, Recombinant,?

Hemi-methylated 199x601 DNA, biotinylated

16-2143

Mononucleosomes, Recombinant,?

Hemi-methylated 199x601 DNA, non-biotinylated

16-2044

Mononucleosomes, Recombinant,?

199x601 DNA, biotinylated

16-2144

Mononucleosomes, Recombinant,?

199x601 DNA, non-biotinylated

16-2045

Mononucleosomes, Recombinant, Symmetrically?

Methylated 199x601 DNA, biotinylated




EpiDyne??Chromatin Remodeling?

Assay Substrates

16-4201

EpiDyne FRET Nucleosome Remodeling?

Assay Substrate

16-4101

EpiDyne Nucleosome Remodeling Assay?

Substrate ST601-GATC1

16-4112

EpiDyne Nucleosome Remodeling Assay?

Substrate ST601-GATC1,2, biotinylated

16-4113

EpiDyne Nucleosome Remodeling Assay?

Substrate ST601-GATC1,2,3, biotinylated

16-4114

EpiDyne Nucleosome Remodeling Assay?

Substrate ST601-GATC1, 50-N-66, biotinylated

16-4115

EpiDyne Nucleosome Remodeling Assay?

Substrate ST601-GATC1,2, 50-N-66, biotinylated

16-4116

EpiDyne Nucleosome Remodeling Assay?

Substrate ST601-GATC1,2,3, 50-N-66, biotinylated




SNAP Spike-in Controls

19-1002

SNAP-CUTANA? K-MetStat Panel

19-1001

SNAP-ChIP K-MetStat Panel

19-2001

SNAP-ChIP OncoStat Panel

19-3001

SNAP-ChIP K-AcylStat Panel




dCypher? Nucleosome Panels

16-9001

dCypher? Nucleosome Full Panel

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想了解更多關(guān)于EpiCypher重組核小體技術(shù)和產(chǎn)品的信息嗎?請(qǐng)聯(lián)系欣博盛!

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EpiCypher的注冊(cè)商標(biāo)和知識(shí)產(chǎn)權(quán)可見(jiàn)鏈接:https://www.epicypher.com/intellectual-property/。

本文中的所有其他商標(biāo)和商品均為其各自公司所有。

本文翻譯自鏈接:https://www.epicypher.com/resources/blog/finding-the-best-substrate-for-studying-histone-modifications/,如與原文有出入的地方,請(qǐng)以英文原文為準(zhǔn)。

未經(jīng)EpiCypher公司事先書(shū)面同意,本文件不得部分或全部復(fù)制。

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關(guān)于EpiCypher公司:

EpiCypher是一家成立于2012年的表觀遺傳學(xué)公司。從專有組蛋白肽陣列平臺(tái)EpiGold?開(kāi)始,EpiCypher開(kāi)發(fā)了一系列同類產(chǎn)品。同時(shí),EpiCypher是重組核小體制造和開(kāi)發(fā)的全球領(lǐng)導(dǎo)者。利用其獨(dú)有技術(shù),不斷增加產(chǎn)品庫(kù)中高純度修飾重組核小體(dNucs?)產(chǎn)品。dNuc?多樣性的產(chǎn)品為破譯組蛋白編碼和加速藥物開(kāi)發(fā)提供了強(qiáng)大的工具。

EpiCypher還將dNuc?技術(shù)廣泛的應(yīng)用于多種分析測(cè)定產(chǎn)品中,包括:SNAP-ChIP??Spike-in Controls(用于抗體分析和ChIP定量), EpiDyne??底物(用于染色質(zhì)重塑和抑制劑篩選及開(kāi)發(fā)),dCyher?測(cè)定(用于探究表觀遺傳蛋白質(zhì)-組蛋白PTM結(jié)合相互作用)。最近,EpiCypher還推出了針對(duì)ChIC、CUT&RUN和CUT&Tag的高靈敏度表觀基因組圖譜CUTANA?分析。



?EpiCypher——優(yōu)質(zhì)核小體的選擇

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