E2 enzymes
E2 enzymes (Ubiquitin-conjugating enzymes) perform the second step in the ubiquitination reaction that targets a protein for degradation via the proteasome.The ubiquitination process covalently attaches ubiquitin, a short protein of 76 amino acids, to a lysine residue on the target protein. Once a protein has been tagged with one ubiquitin molecule, additional rounds of ubiquitination form a polyubiquitin chain that is recognized by the proteasome's 19S regulatory particle, triggering the ATP-dependent unfolding of the target protein that allows passage into the proteasome's 20S core particle, where proteases degrade the target into short peptide fragments for recycling by the cell.
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R-96544 hydrochloride是活性选择性 5-HT2A 拮抗剂。
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Quetiapine hemifumarate是5-HT2/D2 拮抗剂具有抗精神病活性（atypical antipsychotic）。
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Quipazine dimaleate是5-HT3 激动剂。
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PU 02是5-HT3的阴性变构的调节剂（negative allosteric modulator）。
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Prochlorperazine dimaleate是D2 受体拮抗剂。 也是5-HT3 和 nAChR 的拮抗剂。
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