背景介绍 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. Such 30 nm fibers are then condensed in vivo to form thicker interphase fibers or the most highly compacted metaphase chromosome structures 产品介绍 Human recombinant nucleosomes consisting of 147 bp DNA (PCR) and 2 molecules each of histones H2A (a.a. 2-130(end)), H2B (a.a. 2-126(end)), H3 (a.a. 2-137(end)), and H4 (a.a. 2-103(end)), expressed in an E. coli expression system. GenBank Accession Nos. are NM_033445, NM_003528, NM_003532, and NM_003548, respectively. Each histone protein has an N-terminal His-tag. Each H2B has a C-terminal Cys added as a biotinylation site. Total histone MW (before biotinylation) =113.8 kDa.