EC Number   |
Natural Substrates |
|---|
   2.3.1.48 | acetyl-CoA + histone H4 |
H4R3 methylation, catalyzed by PRMT1, facilitates beta-globin transcription by regulating histone acetyltransferase binding, and histone H3 and H4 acetylation, overview |
| 2.3.1.48 | acetyl-CoA + histone H4 |
Hat1 is a primary enzyme for di-acetylating cytosolic histone H4 at Lys5 and Lys12 in the cytosol |
| 2.3.1.48 | more |
HATs perform a conserved mechanism of acetyl-transfer, where the lysine-containing substrate directly attacks enzyme-bound acetyl-CoA. The ability of HATs to form distinct multi-subunit complexes provide a means to regulate HAT activity by altering substrate specificity, targeting to specific loci, enhancing acetyltransferase activity, restricting access of non-target proteins, and coordinating the multiple enzyme activities of the complex |
| 2.3.1.48 | more |
HBO1 histone acetylase is involved in DNA replication licensing and associates with replication origins, located within the HPRT1 coding sequence, specifically during the G1 phase of the cell cycle in a manner that depends on the replication licensing factor Cdt1, but is independent of the Cdt1 repressor geminin |
| 2.3.1.48 | acetyl-CoA + histone H4 |
HBO1 is an H4-specific histone acetylase, and is a coactivator of the DNA replication licensing factor Cdt1. HBO1 acetylase activity is essential for DNA licensing of replication origins, where it controls H4 acetylation at the origins. H4 acetylation at origins is cell-cycle regulated, with maximal activity at the G1/S transition |
| 2.3.1.48 | more |
HBO1 occurs as a component of a multiprotein complex with histone H3 and H4 acetyltransferase activity in 293 cells. The mammalian complex corresponding to the yeast NuA4 complex contains the MYST HAT Tip60 |
| 2.3.1.48 | acetyl-CoA + histone H4 |
HBO1 regulates global histone H4 acetylation |
| 2.3.1.48 | more |
HBO1, Sas2 and Sas3 are involved in transcriptional repression enhancing Sir1-mediated epigenetic gene silencing. NuA3 and NuA4 complexes contain the MYST HATs Sas3 and Esa1, respectively. Sas2 histone acetylation of H4K16 opposed by Sir2 deacetylation of H4K16 at the euchromatin/heterochromatin interface maintains the boundary between regions of transcriptionally active and silent telomeric chromatin. Esa1 plays a role in maintaining the integrity of the DNA, rather than open chromatin structure and high-level transcriptional activity |
| 2.3.1.48 | more |
histone acetylation and deacetylation is an epigenetic mechanism in volved in regulation of mIRNA production. GCN5 has a general repressive effect on microRNAs, miRNAs, and it targets a subset of MIRNA genes, GCN5 is required for acetylation of histone H3 lysine 14 at these loci, overview |
| 2.3.1.48 | histone + acetyl-CoA |
histone acetylation is an important posttranslational modification correlated with gene activation, the HAC1 is involved in the regulation of flowering time via repression of flowering locus C, the enzyme participates in many physiological processes, including proliferation, differentiation, and apoptosis |
