84-4053-22　［取扱停止］HIST4H4 100ul　318840

特徴

• The nucleosome, made up of four core histone proteins (H2A, H2B, H3, and H4), is the primary building block of chromatin.
• Originally thought to function as a static scaffold for DNA packaging, histones have now been shown to be dynamic proteins, undergoing multiple types of post-translational modifications, including acetylation, phosphorylation, methylation, and ubiquitination.
• Histone acetylation occurs mainly on the amino-terminal tail domains of histones H2A (Lys5), H2B (Lys5, 12, 15, and 20), H3 (Lys9, 14, 18, 23, 27, and 56), and H4 (Lys5, 8, 12, and 16) and is important for the regulation of histone deposition, transcriptional activation, DNA replication, recombination, and DNA repair.
• Hyper-acetylation of the histone tails neutralizes the positive charge of these domains and is believed to weaken histone-DNA and nucleosome-nucleosome interactions, thereby destabilizing chromatin structure and increasing the accessibility of DNA to various DNA-binding proteins.
• In addition, acetylation of specific lysine residues creates docking sites for a protein module called the bromodomain, which binds to acetylated lysine residues.
• Many transcription and chromatin regulatory proteins contain bromodomains and may be recruited to gene promoters, in part, through binding of acetylated histone tails.
• Histone acetylation is mediated by histone acetyltransferases (HATs), such as CBP/p300, GCN5L2, PCAF, and Tip60, which are recruited to genes by DNA-bound protein factors to facilitate transcriptional activation.
• Deacetylation, which is mediated by histone deacetylases (HDAC and sirtuin proteins), reverses the effects of acetylation and generally facilitates transcriptional repression.Histone H4 lysine 5 is acetylated by multiple HAT proteins.
• Acetylation by Esa1p in yeast, or Tip60 in mammalian cells, may contribute to both transcriptional activation and DNA repair, including non-homologous end joining and replication-coupled repair.
• Applications:Suitable for use in Western Blot, Immunohistochemistry.
• Other applications not tested.
• Recommended Dilution:Western Blot: 1:500-1:2000Immunohistochemistry: 1:50-1:200Optimal dilutions to be determined by the researcher.
• Storage and Stability:May be stored at 4°C for short-term only.
• Aliquot to avoid repeated freezing and thawing.
• Store at -20°C.
• Aliquots are stable for 12 months after receipt.
• For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.