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Set1
Set1 is a gene that codes for Histone-lysine N-methyltransferase and H3 lysine-4 specific proteins ( H3K). Set1 proteins can also be referred to as COMPASS proteins. The first H3K4 methylase, ''Saccharomyces cerevisiae'' Set1/COMPASS, is highly conserved across a multitude of phylogenies. The histone methylation facilitated by Set1 is required for cell growth and transcription silencing through the repression of RNA polymerase II RNA polymerase II (RNAP II and Pol II) is a multiprotein complex that transcribes DNA into precursors of messenger RNA (mRNA) and most small nuclear RNA (snRNA) and microRNA. It is one of the three RNAP enzymes found in the nucleus of eukaryo .... The Set1C, COMPASS Complex, also aids in transcription elongation regulation and the maintenance of telomere length. References Genes {{Gene-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
COMPASS Complex
Introduction Complex Proteins Associated with Set1, also known as COMPASS, is a conserved protein complex playing a major role as a H3K4me3 methylase Methyltransferases are a large group of enzymes that all methylate their substrates but can be split into several subclasses based on their structural features. The most common class of methyltransferases is class I, all of which contain a Rossm ... in eukaryotes. Since it was first identified in 2001, other members of the COMPASS family of methylases with different functions have been discovered, in particular in humans. The Compass complex, or similar protein complexes, have been identified in species ranging from single celled fungi to humans. They play an important regulatory role in many invaluable biological processes including DNA repair, the progression of the cell cycle and transcription through the methylenation of histone lysines. The COMPASS complex is an example of a trithorax-group protein. The MLL1/SET domain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RNA Polymerase II
RNA polymerase II (RNAP II and Pol II) is a multiprotein complex that transcribes DNA into precursors of messenger RNA (mRNA) and most small nuclear RNA (snRNA) and microRNA. It is one of the three RNAP enzymes found in the nucleus of eukaryotic cells. A 550 kDa complex of 12 subunits, RNAP II is the most studied type of RNA polymerase. A wide range of transcription factors are required for it to bind to upstream gene promoters and begin transcription. Discovery Early studies suggested a minimum of two RNAPs: one which synthesized rRNA in the nucleolus, and one which synthesized other RNA in the nucleoplasm, part of the nucleus but outside the nucleolus. In 1969, science experimentalists Robert Roeder and William Rutter definitively discovered an additional RNAP that was responsible for transcription of some kind of RNA in the nucleoplasm. The finding was obtained by the use of ion-exchange chromatography via DEAE coated Sephadex beads. The technique separated the enzymes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Histone Methylation
Histone methylation is a process by which methyl groups are transferred to amino acids of histone proteins that make up nucleosomes, which the DNA double helix wraps around to form chromosomes. Methylation of histones can either increase or decrease transcription of genes, depending on which amino acids in the histones are methylated, and how many methyl groups are attached. Methylation events that weaken chemical attractions between histone tails and DNA increase transcription because they enable the DNA to uncoil from nucleosomes so that transcription factor proteins and RNA polymerase can access the DNA. This process is critical for the regulation of gene expression that allows different cells to express different genes. Function Histone methylation, as a mechanism for modifying chromatin structure is associated with stimulation of neural pathways known to be important for formation of long-term memories and learning. Animal models have shown methylation and other epigenetic re ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
