A cell-permeable inhibitor and activity-based probe for the caspase-like activity of the proteasome
摘要:
The ubiquitin-proteasome pathway degrades the majority of proteins in mammalian cells and plays an essential role in the generation of antigenic peptides presented by major histocompatibility class I molecules. Proteasome inhibitors are of great interest as research tools and drug candidates. Most work on proteasome inhibitors has focused on the inhibition of the chymotryptic-like (beta 5) sites; little attention has been paid to the inhibition of two other types of active sites, the trypsin-like (beta 2) and the caspase-like (beta 1). We report here the development of the first cell-permeable and highly selective inhibitors (4 and 5) of the proteasome's caspase-like site. The selectivity of the compounds is directly and unambiguously established by Staudinger-Bertozzi labeling of proteasome subunits covalently modified with azide-functionalized inhibitor 5. This labeling reveals that the caspase-like site of the immunoproteasome (beta 1i) is a preferred target of this compound. These compounds can be used as tools to study roles of beta 1 and beta 1i sites in generation of specific antigenic peptides and their potential role as co-targets of anti-cancer drugs. (c) 2007 Elsevier Ltd. All rights reserved.
Water-soluble discrete multi-biotin-containing compounds with at least three (3) biotin moieties are disclosed. The water-soluble biotin-containing compounds may additionally comprise one or more moieties that confer resistance to cleavage by biotinidase or that is cleavable in vitro or in vivo. The discrete multi-biotin-containing compounds may include a reactive moiety that provides a site for reaction with yet another moiety, such as a targeting, diagnostic or therapeutic functional moiety. Biotinylation reagents comprising water-soluble linker moieties are also disclosed and may additionally comprise a biotinidase protective group. Methods for amplifying the number of sites for binding biotin-binding proteins at a selected target using multi-biotin compounds also are disclosed.
organization of K-Ras is controlled by the prenylbinding protein PDEδ, which enhances Ras diffusion in the cytosol. Inhibition of the Ras–PDEδ interaction by small molecules impairs Ras localization and signaling. Here we describe in detail the identification and structure guided development of Ras–PDEδ inhibitors targeting the farnesyl binding pocket of PDEδ with nanomolar affinity. We report kinetic
申请人:Max-Planck-Gesellschaft zur Förderung der
Wissenschaften e.V.
公开号:EP2698367A1
公开(公告)日:2014-02-19
The present invention relates to novel substituted benzimidazoles and stereoisomeric forms, prodrugs, solvates, hydrates and/or pharmaceutically acceptable salts of these compounds as well as pharmaceutical compositions containing at least one of these substituted benzimidazoles together with pharmaceutically acceptable carrier, excipient and/or diluents. Said novel substituted benzimidazoles binding to the prenyl binding pocket of PDEδ have been identified as useful for the prophylaxis and treatment of cancer by the inhibition of the binding of PDEδ to K-Ras and of oncogenic Ras signalling in cells by altering its localization leading to cell death or inhibition of proliferation.
[EN] BENZIMIDAZOLES FOR THE TREATMENT OF CANCER<br/>[FR] BENZIMIDAZOLES POUR LE TRAITEMENT D'UN CANCER
申请人:MAX PLANCK GESELLSCHAFT
公开号:WO2014027053A1
公开(公告)日:2014-02-20
The present invention relates to novel substituted benzimidazoles and stereoisomeric forms, prodrugs, solvates, hydrates and/or pharmaceutically acceptable salts of these compounds as well as pharmaceutical compositions containing at least one of these substituted benzimidazoles together with pharmaceutically acceptable carrier, excipient and/or diluents. Said novel substituted benzimidazoles binding to the prenyl binding pocket of PDEδ have been identified as useful for the prophylaxis and treatment of cancer by the inhibition of the binding of PDEδ to K-Ras and of oncogenic Ras signalling in cells by altering its localization leading to cell death or inhibition of proliferation.
Specific protein-labeling and ligand-binding position analysis with amidopyrene probes as LDI MS tags
作者:Rei Watanabe、Yaping Hu、Keita Iio、Kozo Yoneda、Atsunori Hattori、Atsushi Arai、Hideo Kigoshi、Masaki Kita
DOI:10.1039/c8ob02222d
日期:——
Ligand-dissociation type amidopyrene probes, being useful for LDI MS, were developed for specific protein-labeling and ligand-binding position analysis.