Histone deacetylase 6, domain 1 and histone deacetylase 10
Histone deacetylases 6 and 10 are class IIb Zn-dependent enzymes that catalyze hydrolysis of N(6)-acetyl-lysine of a histone to yield a deacetylated histone (EC 3.5.1.98). Histone acetylation/deacetylation process is important for mediation of transcriptional regulation of many genes. HDACs usually act via association with DNA binding proteins to target specific chromatin regions. HDAC6 is the only histone deacetylase with internal duplication of two catalytic domains which appear to function independently of each other, and also has a C-terminal ubiquitin-binding domain. It is located in the cytoplasm and associates with microtubule motor complex, functioning as the tubulin deacetylase and regulating microtubule-dependent cell motility. HDAC10 has an N-terminal deacetylase domain and a C-terminal pseudo-repeat that shares significant similarity with its catalytic domain. It is located in the nucleus and cytoplasm, and is involved in regulation of melanogenesis. It transcriptionally down-regulates thioredoxin-interacting protein (TXNIP), leading to altered reactive oxygen species (ROS) signaling in human gastric cancer cells. Known interaction partners of HDAC6 are alpha tubulin (substrate) and ubiquitin-like modifier FAT10 (also known as Ubiquitin D or UBD) while interaction partners of HDAC10 are Pax3, KAP1, hsc70 and HDAC3 proteins.
Comment:Active center contains inhibitor and a catalytic Zn ion that coordinates side chain atoms of two aspartates and one histidine, and a water molecule.
Jiyao W et al.(2023). "The conserved domain database in 2023.",