Development of peptidomimetic boronates as proteasome inhibitors
摘要:
Proteasome inhibition has emerged over the past decade as an effective therapeutic approach for the treatment of hematologic malignancies. It is a multicatalytic complex, whose proteolytic activity relies in three types of subunits: chymotrypsin-like (beta 5), trypsin-like (beta 2) and caspase-like (beta 1). Most important for the development of effective antitumor agents is the inhibition of the beta 5 subunits. In this context, the dipeptide boronate bortezomib (Velcade (R)) represents the first proteasome inhibitor approved by the FDA and the lead compound in drug discovery. This paper describes the synthesis and biological evaluation of a series of conformationally constrained pseudopeptide boronates (1-3) structurally related to bortezomib. The synthesized compounds showed a promising inhibitory profile by blocking primarily the chymotrypsin-like activity of the proteasome with K-i values in submicromolar/micromolar range. These compounds also resulted quite selective since no significant inhibition was recorded in the test against bovine pancreatic alpha-chymotrypsin. The obtained results were rationalized by means of docking experiments based on a model of the crystal structure of bortezomib bound to the yeast 20S proteasome providing essential insights for further optimization of this class of inhibitors. (C) 2013 Elsevier Masson SAS. All rights reserved.
The present invention further relates to a method of inhibiting MRP1 in a mammal which comprises administering to a mammal in need thereof an effective amount of a compound of formula (I).
本发明还涉及一种抑制哺乳动物中MRP1的方法,包括向需要的哺乳动物施用化合物(I)的有效量。
A Fragment-Based Method to Discover Irreversible Covalent Inhibitors of Cysteine Proteases
作者:Stefan G. Kathman、Ziyang Xu、Alexander V. Statsyuk
DOI:10.1021/jm500345q
日期:2014.6.12
reported which irreversibly tethers drug-like fragments to catalytic cysteines. We attached an electrophile to 100 fragments without significant alterations in the reactivity of the electrophile. A mass spectrometry assay discovered three nonpeptidic inhibitors of the cysteineprotease papain. The identified compounds display the characteristics of irreversibleinhibitors. The irreversible tethering system
Value of zeolites in asymmetric induction during photocyclization of pyridones, cyclohexadienones and naphthalenones
作者:Karthikeyan Sivasubramanian、Lakshmi S. Kaanumalle、Sundararajan Uppili、V. Ramamurthy
DOI:10.1039/b702572f
日期:——
approaches, have been examined within zeolites with the aim of achieving asymmetricinduction during the photocyclization of cyclohexadienone, naphthalenone and pyridone derivatives. Within zeolites, enantioselectivity as high as 55% and diastereoselectivity as high as 88% have been obtained. The observed stereoselectivities are significant given the fact that these reactions gave very little stereoselectivities