Mononucleosomes, Human Recombinant Biotinylated Description: Mononucleosomes assembled from recombinant human histones expressed in E. coli (two each of histones H2A, H2B, H3 and H4. Accession numbers: H2A-P04908; H2B-O60814; H3.1-P68431; H4-P62805) wrapped by 147 base pairs of 601 positioning sequence DNA. There is a 5’ biotin-TEG group on the DNA which makes them ideal for use in nucleosome binding assays and pull-down experiments. The nucleosome is the basic subunit of chromatin.
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Mononucleosomes, Human Recombinant Biotinylated Formulation: Purified recombinant mononucleosomes (50 µg total mass protein+DNA, 27.3 µg protein) in 10 mM Tris-HCl pH 7.5, 1 mM EDTA, 25 mM NaCl, 2 mM DTT, & 20% glycerol.
Mononucleosomes, Human Recombinant Biotinylated Storage and Stability: Stable for six months at -20°C from date of receipt. For best results, aliquot and avoid multiple freeze/thaws.
Mononucleosomes, Human Recombinant Biotinylated Application Notes: Mononucleosomes, Human Recombinant Biotinylated are highly purified and are suitable for use as substrates in enzyme screening assays or for nucleosome binding experiments. The absence of post-translational histone modifications makes them ideal for conducting enzyme activity and screening assays. The biotin group on the DNA makes pull-down experiments possible, allowing you to isolate the nucleosomes after your assay is complete. EpiCypher Mononucleosomes, Human Recombinant Biotinylated do not contain free DNA which could alter assayed activities.
References: Strelow JM et al (2016). J Biomol Screen 21: 786-794. Link Munari F et al (2012). J Biol Chem 287: 33756-33765. Link Luger K et al (1999). Methods Mol Biol 119: 1-16. Link Lowary PT and J Widom (1998). J Mol Biol 276: 19-42. Link
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DNA Gel Data: Mononucleosomes, Human Recombinant Biotinylated run on an agarose gel and stained with ethidium bromide to visualize DNA. Lane 1: DNA extracted from nucleosomes (100 ng). Lane 2: Intact nucleosomes (200 ng total, ~100 ng DNA and ~100 ng histone protein) run on gel. Intact nucleosomes migrate much higher than free DNA, thus the DNA resolves at a higher molecular weight when nucleosome-bound. Note absence of free DNA in Lane 2 (arrow), indicating all DNA complexed with histones. Click image to enlarge.
Protein Gel Data: Coomassie stained PAGE gel of proteins in Mononucleosomes, Human Recombinant Biotinylated (0.5 µg) to demonstrate the purity and integrity of the histones in the preparation. Sizes of molecular weight markers and positions of the core histones (H2A, H2B, H3 and H4) are indicated. Click image to enlarge.
Histone Methyltransderas Assay Data: Recombinant SET8 histone methyltransferase was used in radioactive methyltransferase assays with a variety of substrates as indicated, with SET8 exhibiting the highest level of activity in combination with recombinant nucleosomes (rNucs). Click image to enlarge.