Discovery of the first inhibitors of bacterial enzyme d-aspartate ligase from Enterococcus faecium (Aslfm)
摘要:
The D-aspartate ligase of Enterococcus faecium (Asl(fm)) is an attractive target for the development of narrow-spectrum antibacterial agents that are active against multidrug-resistant E. faecium. Although there is currently little available information regarding the structural characteristics of Asl(fm), we exploited the knowledge that this enzyme belongs to the ATP-grasp superfamily to target its ATP binding site. In the first design stage, we synthesized and screened a small library of known ATP-competitive inhibitors of ATP-grasp enzymes. A series of amino-oxazoles derived from bacterial biotin carboxylase inhibitors showed low micromolar activity. The most potent inhibitor compound 12, inhibits Asl(fm) with a K-i value of 2.9 mu M. In the second design stage, a validated ligand-based pharmacophore modeling approach was used, taking the newly available inhibition data of an initial series of compounds into account. Experimental evaluation of the virtual screening hits identified two novel structural types of Asl(fm) inhibitors with 7-amino-9H-purine (18) and 7-amino-1H-pyrazolo[3,4-d]pyrimidine (30 and 34) scaffolds, and also with K-i values in the low micromolar range. Investigation the inhibitors modes of action confirmed that these compounds are competitive with respect to the ATP molecule. The binding of inhibitors to the target enzyme was also studied using isothermal titration calorimetry (ITC). Compounds 6, 12, 18, 30 and 34 represent the first inhibitors of Asl(fm) reported to date, and are an important step forward in combating infections due to E. faecium. (C) 2013 Elsevier Masson SAS. All rights reserved.
Discovery of the first inhibitors of bacterial enzyme d-aspartate ligase from Enterococcus faecium (Aslfm)
摘要:
The D-aspartate ligase of Enterococcus faecium (Asl(fm)) is an attractive target for the development of narrow-spectrum antibacterial agents that are active against multidrug-resistant E. faecium. Although there is currently little available information regarding the structural characteristics of Asl(fm), we exploited the knowledge that this enzyme belongs to the ATP-grasp superfamily to target its ATP binding site. In the first design stage, we synthesized and screened a small library of known ATP-competitive inhibitors of ATP-grasp enzymes. A series of amino-oxazoles derived from bacterial biotin carboxylase inhibitors showed low micromolar activity. The most potent inhibitor compound 12, inhibits Asl(fm) with a K-i value of 2.9 mu M. In the second design stage, a validated ligand-based pharmacophore modeling approach was used, taking the newly available inhibition data of an initial series of compounds into account. Experimental evaluation of the virtual screening hits identified two novel structural types of Asl(fm) inhibitors with 7-amino-9H-purine (18) and 7-amino-1H-pyrazolo[3,4-d]pyrimidine (30 and 34) scaffolds, and also with K-i values in the low micromolar range. Investigation the inhibitors modes of action confirmed that these compounds are competitive with respect to the ATP molecule. The binding of inhibitors to the target enzyme was also studied using isothermal titration calorimetry (ITC). Compounds 6, 12, 18, 30 and 34 represent the first inhibitors of Asl(fm) reported to date, and are an important step forward in combating infections due to E. faecium. (C) 2013 Elsevier Masson SAS. All rights reserved.
There is provided a compound of formula (I):
processes for the manufacture thereof, pharmaceutical compositions thereof and uses in therapy.
提供了一个公式(I)的化合物,其制造过程,制药组合物及其在治疗中的用途。
ARYLAMIDE DERIVATIVES AS TTX-S BLOCKERS
申请人:Yamagishi Tatsuya
公开号:US20140336377A1
公开(公告)日:2014-11-13
The present invention relates to arylamide derivatives which have blocking activities of voltage gated sodium channels as the TTX-S channels, and which are useful in the treatment or prevention of disorders and diseases in which voltage gated sodium channels are involved. The invention also relates to pharmaceutical compositions comprising these compounds and the use of these compounds and compositions in the prevention or treatment of such diseases in which voltage gated sodium channels are involved.
The present invention relates to arylamide derivatives which have blocking activities of voltage gated sodium channels as the TTX-S channels, and which are useful in the treatment or prevention of disorders and diseases in which voltage gated sodium channels are involved. The invention also relates to pharmaceutical compositions comprising these compounds and the use of these compounds and compositions in the prevention or treatment of such diseases in which voltage gated sodium channels are involved.
There is provided a compound of formula (I):
processes for the manufacture thereof, pharmaceutical compositions thereof and uses in therapy.
提供了一个公式(I)的化合物:其制造过程,制药组合物及其在治疗中的用途。
Design, Synthesis, and Antibacterial Properties of Dual-Ligand Inhibitors of Acetyl-CoA Carboxylase
作者:Molly A. Silvers、Gregory T. Robertson、Carol M. Taylor、Grover L. Waldrop
DOI:10.1021/jm501082n
日期:2014.11.13
There is an urgent demand for the development of new antibiotics due to the increase in drug-resistant pathogenic bacteria. A novel target is the multifunctional enzyme acetyl-CoA carboxylase (ACC), which catalyzes the first committed step in fatty acid synthesis and consists of two enzymes: biotin carboxylase and carboxyltransferase. Covalently attaching known inhibitors against these enzymes with saturated hydrocarbon linkers of different lengths generated dual-ligand inhibitors. Kinetic results revealed that the dual-ligands inhibited the ACC complex in the nanomolar range. Microbiology assays showed that the dual-ligand with a 15-carbon linker did not exhibit any antibacterial activity, while the dual-ligand with a 7-carbon linker displayed broad-spectrum antibacterial activity as well as a decreased susceptibility in the development of bacterial resistance. These results suggest that the properties of the linker are vital for antibacterial activity and show how inhibiting two different enzymes with the same compound increases the overall potency while also impeding the development of resistance.