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Scientific Background
Chromatin, the material into which genomic DNA is packaged in eukaryotes, is a very dynamic structure. The smallest subunit of chromatin is the nucleosome, consisting of ~147 base pairs of DNA wrapped around an octamer of core histone proteins. The histone octamer is composed of a central heterotetramer of histones H3 and H4, flanked by two heterodimers of histones H2A and H2B. Each nucleosome is separated by 10 to 60 bp of linker DNA. The resulting nucleosomal array constitutes a chromatin fiber of about 10 nm in diameter. This arrangement is folded into more condensed fibers (about 30 nm) that are stabilized by binding of a linker histone (Histone H1) to each nucleosome core.
Product Description
E. coli ExpressionRecombinant Recombinant Nucleosome Human protein is produced using a validated E. coli expression system and supplied in aqueous buffer solution. Suitable for enzyme kinetics, inhibitor screening, binding assays, structural studies, and related biochemical research applications.
Protein Specifications
| UniProt ID | Q7L7L0, Q16778, P68431, P62805 |
|---|---|
| Expression System | E. coli |
| Affinity Tag | N-terminal His-tag, Biotin |
| Molecular Weight | 113.8 kDa |
| Formulation | 20 mM Tris-HCl, pH 7.5, 1 mM EDTA, 1 mM DTT, and 20% glycerol. |
| Storage | Stable at -80°C for at least 6 months from date of receipt, when stored as direc… |
| Biosafety Level | Not applicable (BSL-1) |
Safety & Handling
Avoid freeze/thaw cycles.
This protein was produced in E. coli. Expression system selection determines post-translational processing, disulfide bond formation, and co-factor incorporation — all of which affect enzymatic activity. Insect cell (Sf9) systems are preferred for kinases and multi-subunit enzymes that require phosphorylation or chaperone assistance; E. coli is used for structurally simpler proteins.
The expressed amino acid region is specified in the product description. Confirm the region includes your domain of interest — the active site, binding pocket, or substrate recognition sequence — before placing your order. Refer to the UniProt database for domain annotation.
Purity is assessed by SDS-PAGE; see the Certificate of Analysis. A gel image is provided with each lot. BPS Bioscience performs rigorous QC on each lot, including purity assessment and functional activity testing where applicable. Contact technical support if purity ≥99% is required for biophysical measurements.
Substrate for histone methyltransferase or acetyltransferase assays. Ideal for screening small molecular inhibitors of histone methyltransferases and acetyltransferases for drug discovery and HTS applications. Since these nucleosomes were prepared in Refer to the product datasheet for validated protocols and recommended assay conditions. Contact BioHippo technical support for application-specific guidance.
Stable at -80°C for at least 6 months from date of receipt, when stored as directed Avoid repeated freeze-thaw cycles — prepare single-use working aliquots. Add BSA or glycerol to aliquots if storing diluted enzyme is necessary. Typical stability is at least 6 months at −80°C.
BioHippo offers flexible sourcing for qualified research institutions and partners.
- Bulk quantities: Large-scale orders for HTS campaigns or structural studies.
- Custom constructs: Alternative tag positions, truncation variants, or point mutants may be available upon request.
- Biotinylated variants: Avi-Tag site-specific biotinylation is available for SPR/BLI surface capture applications.
- Extended QC data: Activity assay data, SEC-HPLC profiles, or additional purity methods available on request.
Contact BioHippo customer support for custom requirements.
- Meagher, R.B., Mussar, K.J., Epigenetics Chromatin 2012 Jul 20,5(1):11.
- Huang, H., et al., Biosystems 2012 Aug,109(2):214-9.
