Recombinant Mononucleosomes H3K4me2 (EPL)

Catalog No: 81073 Format: 20 µg $400 Buy

Expressed In: E. coli Protein Species: Human

Expressed Protein Ligation

Recombinant Mononucleosomes H3K4me2 (EPL) has been generated using the patented Expressed Protein Ligation (EPL) technology. EPL can be used to generate methylated, acetylated or phosphorylated histones. In EPL, the histone globular domain is ligated to a peptide that contains the N-terminal histone tail with the desired site-specific modification. The ligation reaction maintains the native histone bonds, and the resulting recombinant protein more closely mimics natural histones.

Contents

A representative Technical Data Sheet (TDS) is provided here. Please refer to the lot-specific TDS you will receive with your order for the lot-specific buffer contents and protein concentration.

Background

In vivo, histones are wrapped around by DNA in chromatin. Therefore, nucleosomes are more physiologically relevant substrates than histones and histone-derived peptides for in vitro studies. More importantly, some histone methyltransferases are significantly more active, as well as specific, when using nucleosomal substrates in HMT assays, such as DOT1L and NSD family enzymes. Nucleosomes are also widely used in histone methyltransferase screening assays to identify small molecular inhibitors for drug discovery.

Application Notes

Recombinant Mononucleosomes H3K4me2 (EPL) are suitable for use in the study of enzyme kinetics, inhibitor screening, and selectivity profiling.

Protein Details

Recombinant Mononucleosomes H3K4me2 (EPL) consist of a 167 bp of 601 DNA and two molecules each of histones H2A that includes amino acids 1-130 (end) (accession number NP_003503.1), H2B that includes amino acids 1-126 (end) (accession number NP_003509.1), H3.2 that includes amino acids 1-136 (end) (accession number NP_066403.2) with dimethylation at lysine 4, and H4 that includes amino acids 1-103 (end) (accession number NP_003539.1). All of these histones were expressed in E. coli cells. The molecular weight of histone octamer is ~108 kDa.

H3K4me2 (Histone H3 dimethyl Lys4) protein is generated using expressed protein ligation (EPL) technology. Truncated human Histone H3.2 is produced in E. coli and purified using FPLC. The purified protein is subsequently ligated to a N-terminal histone tail peptide containing dimethyl lysine 4 via a native peptide bond.

 

Recombinant Mononucleosomes H3K4me2 (EPL) SDS PAGE
13% SDS-PAGE Coomassie staining
Purity: ≥ 95% 

Recombinant Mononucleosomes H3K4me2 (EPL) - DNA gel
Mononucleosomes were run on a 2% agarose gel and stained with ethidium bromide. Lane 1: DNA marker. Lane 2: 601 DNA. Lane 3: Intact nucleosome. Intact nucleosomes migrate much higher than free 601 DNA.
The agarose gel result shows almost all of 601 DNA wraps histone octamers to form nucleosomes. 

Recombinant Mononucleosomes H3K4me2 (EPL) tested by Western blot.
Unmodified nucleosomes (Lane 1) and Recombinant Mononucleosomes H3K4me2 (EPL) (Lane 2) were detected with anti-H3K4me2 antibody (Cat# 39679) and anti-H4 antibody (Cat# 61300), respectively. H3 was detected as loading control.
Only Recombinant Mononucleosomes H3K4me2 (EPL) can be detected by anti-H3K4me2 antibody.

Storage

Recombinant proteins in solution are temperature sensitive and must be stored at -80°C to prevent degradation. Avoid repeated freeze/thaw cycles and keep on ice when not in storage.

Guarantee

This product is for research use only and is not for use in diagnostic procedures. This product is guaranteed for 6 months from date of arrival.