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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Tropanyl-3，5-dimethylbenzoate是5-HT3的拮抗剂。
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Tegaserod maleate是5-HT4部分激动剂。
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Tandospirone hydrochloride是选择性5-HT1A 部分激动剂。
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ST 1936 oxalate是选择性， 高亲和性5-HT6激动剂。
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SR 57227 hydrochloride是活性的， 选择性 5-HT3 激动剂。
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