A method to greatly improve the enantioselectivity of lipase-catalyzed hydrolysis using sodium dodecyl sulfate (SDS) as an additive
摘要:
The addition of sodium dodecyl sulfate (SDS) resulted in a dramatic improvement of the enantioselectivity of the lipasecatalyzed hydrolysis of racemic butyl 2-(4-substituted phenoxy)propanoates, racemic butyl 2-(4-isobutylphenyl)propanoate, and racemic butyl 2-(6-methoxy-2-naphthyl)propanoate in an aqueous buffer solution. An increase in the E value by up to two orders of magnitude was observed for some esters. As to the effects of SDS on the structure of a lipase, FT-IR and fluorescence measurements suggest some conformational change and/or an increase of the flexibility of the lipase, although the native secondary structure of the lipase is held even in the presence of 100 mM SDS. The origin of the enantioselectivity enhancement brought about by the addition of SDS is briefly discussed on the basis of the values of the initial rates obtained for each enantiomer of the substrate. (c) 2005 Elsevier Ltd. All rights reserved.
Proteasome chymotrypsin-like inhibition using PI-1833 analogs
申请人:H. Lee Moffitt Cancer Center and Research Institute, Inc.
公开号:US10662180B2
公开(公告)日:2020-05-26
Focused library synthesis and medicinal chemistry on an oxadiazole-isopropylamide core proteasome inhibitor provided the lead compound that strongly inhibits CT-L activity. Structure activity relationship studies indicate the amide moiety and two phenyl rings are sensitive toward synthetic modifications. Only para-substitution in the A-ring was important to maintain potent CT-L inhibitory activity. Hydrophobic residues in the A-ring's para-position and meta-pyridyl group at the B-ring significantly improved inhibition. The meta-pyridyl moiety improved cell permeability. The length of the aliphatic chain at the para position of the A-ring is critical with propyl yielding the most potent inhibitor, whereas shorter (i.e. ethyl, methyl or hydrogen) or longer (i.e. butyl, propyl and hexyl) chains demonstrating progressively less potency. Introduction of a stereogenic center next to the ether moiety (i.e. substitution of one of the hydrogens by methyl) demonstrated chiral discrimination in proteasome CT-L activity inhibition (the S-enantiomer was 35-40 fold more potent than the R-enantiomer).
通过对一种噁二唑-异丙基酰胺核心蛋白酶体抑制剂进行重点文库合成和药物化学研究,获得了能强烈抑制 CT-L 活性的先导化合物。结构活性关系研究表明,酰胺分子和两个苯基环对合成修饰很敏感。只有 A 环中的对位取代对保持 CT-L 的强效抑制活性非常重要。A 环的对位疏水残基和 B 环的元吡啶基能显著改善抑制作用。偏吡啶基提高了细胞渗透性。A 环对位脂肪族链的长度至关重要,丙基产生的抑制作用最强,而较短的链(即乙基、甲基或氢基)或较长的链(即丁基、丙基和己基)的抑制作用则逐渐减弱。在醚分子旁边引入一个立体中心(即用甲基取代其中一个氢)可在蛋白酶体 CT-L 活性抑制方面显示出手性差异(S-对映体的效力比 R-对映体高 35-40 倍)。
[EN] PROTEASOME CHYMOTRYPSIN-LIKE INHIBITION USING PI-1833 ANALOGS<br/>[FR] INHIBITION DE CHYMOTRYPSINE-LIKE DU PROTÉASOME À L'AIDE D'ANALOGUES DE PI-1833
申请人:H LEE MOFFITT CANCER CT & RES
公开号:WO2012129564A3
公开(公告)日:2012-12-27
US9878999B2
申请人:——
公开号:US9878999B2
公开(公告)日:2018-01-30
A method to greatly improve the enantioselectivity of lipase-catalyzed hydrolysis using sodium dodecyl sulfate (SDS) as an additive
The addition of sodium dodecyl sulfate (SDS) resulted in a dramatic improvement of the enantioselectivity of the lipasecatalyzed hydrolysis of racemic butyl 2-(4-substituted phenoxy)propanoates, racemic butyl 2-(4-isobutylphenyl)propanoate, and racemic butyl 2-(6-methoxy-2-naphthyl)propanoate in an aqueous buffer solution. An increase in the E value by up to two orders of magnitude was observed for some esters. As to the effects of SDS on the structure of a lipase, FT-IR and fluorescence measurements suggest some conformational change and/or an increase of the flexibility of the lipase, although the native secondary structure of the lipase is held even in the presence of 100 mM SDS. The origin of the enantioselectivity enhancement brought about by the addition of SDS is briefly discussed on the basis of the values of the initial rates obtained for each enantiomer of the substrate. (c) 2005 Elsevier Ltd. All rights reserved.
PROTEASOME CHYMOTRYPSIN-LIKE INHIBITION USING PI-1833 ANALOGS
申请人:H. Lee Moffitt Cancer Center and Research Institute, Inc
公开号:US20140073650A1
公开(公告)日:2014-03-13
Focused library synthesis and medicinal chemistry on an oxadiazole-isopropylamide core proteasome inhibitor provided the lead compound that strongly inhibits CT-L activity. Structure activity relationship studies indicate the amide moiety and two phenyl rings are sensitive toward synthetic modifications. Only para-substitution in the A-ring was important to maintain potent CT-L inhibitory activity. Hydrophobic residues in the A-ring's para-position and meta-pyridyl group at the B-ring significantly improved inhibition. The meta-pyridyl moiety improved cell permeability. The length of the aliphatic chain at the para position of the A-ring is critical with propyl yielding the most potent inhibitor, whereas shorter (i.e. ethyl, methyl or hydrogen) or longer (i.e. butyl, propyl and hexyl) chains demonstrating progressively less potency. Introduction of a stereogenic center next to the ether moiety (i.e. substitution of one of the hydrogens by methyl) demonstrated chiral discrimination in proteasome CT-L activity inhibition (the S-enantiomer was 35-40 fold more potent than the R-enantiomer).