生物活性

E 64c is a derivative of naturally occurring epoxide inhibitor of cysteine proteases, a Calcium-activated neutral protease (CANP) inhibitor and a very weak irreversible cathepsin C inhibitor. E 64c exhibits entry-blocking effect for MERS-CoV.

IC₅₀ & Target

Cysteine proteases^[1], CANP^[2], Cathepsin C^[3].

体外研究
(In Vitro)

E-64c, a derivative of naturally occurring epoxide inhibitor of cysteine proteases, with papain; especially with regard to the hydrogen bonding and hydrophobic interactions of the ligands with conserved residues in the catalytic binding site^[1]. E 64c (k₂/K_i=140±5M^-1s^-1) is demonstrated to be a lead structure for the development of irreversible cathepsin C inhibitors^[3].

体内研究
(In Vivo)

The t-1/2 of plasma E-64c is 0.48 hours. The hemodynamic effects of E-64c are absent at this dose. Using two way analysis of variance, the effects of reperfusion (p=0.0016) or E-64c (p=0.0226) per se on infarct size are significant. In comparing Group A with Group B and Group C with Group D, the depletion of CPK in the E-64c treated groups (Groups A and C) is slightly less than in the vehicle-injected groups (Groups B and D). The insufficient effect of E-64c alone may be explained by the early administration and relatively short t-1/2. Since the effectiveness of NCO-700 has been established,6),7) our findings might indicate a small but beneficial effect of E-64c on infarct size and CPK content^[2].

分子量

314.38

Formula

C??H??N?O?

CAS 号

76684-89-4

SMILES

O=C([C@H]1O[C@@H]1C(N[C@H](C(NCCC(C)C)=O)CC(C)C)=O)O

运输条件

Room temperature in continental US; may vary elsewhere.

储存方式

溶解性数据

In Vitro: 

DMSO : 250 mg/mL (795.22 mM; Need ultrasonic)

配制储备液

*

请根据产品在不同溶剂中的溶解度选择合适的溶剂配制储备液；一旦配成溶液，请分装保存，避免反复冻融造成的产品失效。
储备液的保存方式和期限：-80°C, 6 months; -20°C, 1 month。-80°C 储存时，请在 6 个月内使用，-20°C 储存时，请在 1 个月内使用。

In Vivo:

请根据您的实验动物和给药方式选择适当的溶解方案。以下溶解方案都请先按照 In Vitro 方式配制澄清的储备液，再依次添加助溶剂：

——为保证实验结果的可靠性，澄清的储备液可以根据储存条件，适当保存；体内实验的工作液，建议您现用现配，当天使用； 以下溶剂前显示的百
分比是指该溶剂在您配制终溶液中的体积占比；如在配制过程中出现沉淀、析出现象，可以通过加热和/或超声的方式助溶

1.请依序添加每种溶剂： 10% DMSO    40% PEG300    5% Tween-80    45% saline

Solubility: ≥ 2.08 mg/mL (6.62 mM); Clear solution

此方案可获得 ≥ 2.08 mg/mL (6.62 mM，饱和度未知) 的澄清溶液。

以 1 mL 工作液为例，取 100 μL 20.8 mg/mL 的澄清 DMSO 储备液加到 400 μL PEG300 中，混合均匀；向上述体系中加入50 μL Tween-80，混合均匀；然后继续加入 450 μL生理盐水定容至 1 mL。

2.请依序添加每种溶剂： 10% DMSO    90% (20% SBE-β-CD in saline)

Solubility: ≥ 2.08 mg/mL (6.62 mM); Clear solution

此方案可获得 ≥ 2.08 mg/mL (6.62 mM，饱和度未知) 的澄清溶液。

以 1 mL 工作液为例，取 100 μL 20.8 mg/mL 的澄清 DMSO 储备液加到 900 μL 20% 的 SBE-β-CD 生理盐水水溶液中，混合均匀。

3.请依序添加每种溶剂： 10% DMSO    90% corn oil

Solubility: ≥ 2.08 mg/mL (6.62 mM); Clear solution

此方案可获得 ≥ 2.08 mg/mL (6.62 mM，饱和度未知) 的澄清溶液，此方案不适用于实验周期在半个月以上的实验。

以 1 mL 工作液为例，取 100 μL 20.8 mg/mL 的澄清 DMSO 储备液加到 900 μL玉米油中，混合均匀。

参考文献

[1]. Khan MS, et al. Design, synthesis, evaluation and thermodynamics of 1-substituted pyridylimidazo[1,5-a]pyridine derivatives as cysteine protease inhibitors. PLoS One. 2013 Aug 5;8(8):e69982.

[2]. Toda G, et al. Calcium-activated neutral protease inhibitor (E-64c) and reperfusion for experimental myocardial infarction. Jpn Heart J. 1989 May;30(3):375-86.

[3]. Radzey H, et al. E-64c-hydrazide: a lead structure for the development of irreversible cathepsin C inhibitors. ChemMedChem. 2013 Aug;8(8):1314-21.

[4]. Ji Yeun Kim, et al. Safe, High-Throughput Screening of Natural Compounds of MERS-CoV Entry Inhibitors Using a Pseudovirus Expressing MERS-CoV Spike Protein. Int J Antimicrob Agents. 2018 Nov;52(5):730-732.