Protein ubiquitination is the end product of a multienzyme cascade that involves sequential thiol-ester bond interactions between ubiquitin and enzymes termed E1 ubiquitin-activating enzymes, E2 ubiquitin-conjugating enzymes, and E3 ubiquitin protein ligases. UBE3A (human papilloma virus E6-associated protein; E6-AP) is an E3 ubiquitin protein ligase that is linked to the neurological disorder Angelman syndrome. It mediates the interaction of human papilloma virus types 16 and 18 E6 proteins with p53, which targets p53 to the ubiquitination-proteasome degradation pathway. The C-terminal region of UBE3A contains a hect domain, which is found in many E3 ubiquitin protein ligases, while the central region contains an E6 binding region. UBE3A is expressed in the cytoplasm and nucleus of many tissues. The interaction of UBE3A with the progesterone receptor coactivates transciptional activity of the receptor in the presence of bound hormone. Thus, UBE3A is an essential component of the ubiquitination degradation pathway and the nuclear hormone receptor signal transduction pathways.
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注意事项：
1.Since applications vary, each investigator should titrate the reagent to obtain optimal results.
2.Caution: Sodium azide yields highly toxic hydrazoic acid under acidic conditions. Dilute azide compounds in running water before discarding to avoid accumulation of potentially explosive deposits in plumbing.
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