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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PNU 109291是活性选择性 5-HT1D 激动剂。
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PNU 142633是高选择性 5-HT1D 激动剂。
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PNU 22394 hydrochloride是5-HT2C 激动剂，5-HT2A/2B 部分激动剂。
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Pentoxyresorufin是Fluorometric cytochrome P450 substrate。
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Paroxetine maleate是高活性的，选择性 5-HT 摄取抑制剂（uptake inhibitor）。
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