Synthesis and in vitro anti-HSV-1 activity of a novel Hsp90 inhibitor BJ-B11.

In this study, a novel Hsp90 inhibitor BJ-B11, was synthesized and evaluated for in vitro antiviral activity against several viruses. Possible anti-HSV-1 mechanisms were also investigated. BJ-B11 displayed no antiviral activity against coxsackievirus B(3) (CVB(3)), human respiratory syncytial virus (RSV) and influenza virus (H1N1), but exhibited potent anti-HSV-1 and HSV-2 activity with EC(50) values of 0.42±0.18 µM and 0.60±0.21 µM, respectively. Additionally, the inhibitory effects of BJ-B11 against HSV-1 were likely to be introduced at early stage of infection. Our results indicate that BJ-B11 with alternative mechanisms of action is potent as an anti-HSV clinical trial candidate.

Protease immobilization on gamma-Fe2O3/Fe3O4 magnetic nanoparticles for the synthesis of oligopeptides in organic solvents.

The use of nanobiocatalysts, with the combination of nanotechnology and biotechnology, is considered as an exciting and rapidly emerging area. The use of iron oxide magnetic nanoparticles, as enzyme immobilization carriers, has drawn great attention because of their unique properties, such as controllable particle size, large surface area, modifiable surface, and easy recovery. In this study, various gamma-Fe(2)O(3)/Fe(3)O(4) magnetic nanoparticles with immobilized proteases were successfully prepared by three different immobilization strategies including A) direct binding, B) with thiophene as a linker, and C) with triazole as a linker. The oligopeptides syntheses catalyzed by these magnetic nanoparticles (MNPs) with immobilized proteases were systematically studied. Our results show that i) for magnetic nanoparticles immobilized alpha-chymotrypsin, both immobilization strategies A and B furnished good reusability for the Z-Tyr-Gly-Gly-OEt synthesis, the MNPs enzymes can be readily used at least five times without significant loss of its catalytic performance: ii) In the case of Z-Asp-Phe-OMe synthesis catalyzed by magnetic nanoparticles immobilized thermolysin, immobilization Strategy B provided the best recyclability: iii) For the immobilized papain, although Strategy A or B afforded an immobilized enzyme for the first cycle of Z-Ala-Leu-NHNHPh synthesis in good yield, their subsequent catalytic activity decreased rapidly. In general, the gamma-Fe(2)O(3) MNPs were better for use as an immobilization matrix, rather than the Fe(3)O(4) MNPs, owing to their smaller particle size and higher surface area.

Assembly of Anionic Conjugated Polymer with 6-O-Modified PNP-ß-Galactoside for Fluorescence Logic-signal-based Multiplex Detections of Enzymes.

Anionic conjugated polymer (PFP-SO 3-) was assembled with a novel enzymatic substrate 6-O-modified PNP-ß-galactoside (1) for sensitive multiplex enzyme detections. The PFP-SO 3-/1/lipase/ß-galactosidase system has two chemical input signals which are Input 1 (lipase) and Input 2 (ß-galactosidase), and output optical signals such as fluorescence emission at 416 nm or 450 nm. Four types of logic gates, including YES, INH, NAND and AND, were successfully constructed and utilized for multiplex detections of lipase and ß-galactosidase in one tube.