Bisphosphonate Inhibition of the Exopolyphosphatase Activity of the Trypanosoma brucei Soluble Vacuolar Pyrophosphatase
摘要:
Trypanosoma brucei, the causative agent of African trypanosomiasis, contains a soluble, vacuolar pyrophosphatase, TbVSP1, not present in humans, which is essential for the growth of bloodstream forms in their mammalian host. Here, we report the inhibition of a recombinant TbVSP1 expressed in Escherichia coli by a panel of 81 bisphosphonates. The IC50 values were found to vary from similar to 2 to 850 mu M. We then used 3D QSAR (comparative molecular field and comparative molecular similarity index; CoMFA and CoMSIA) methods to analyze the enzyme inhibition results. The R-2 values for the experimental versus the QSAR-predicted activities were 0.78 or 0.61 for CoMFA and 0.79 or 0.68 for CoMSIA, for two different alignments. The root-mean-square (rms) pIC(50) error for the best CoMFA model was 0.41 for five test sets of five activity predictions, which translates to a factor of similar to 2.6 error in IC50 prediction. For CoMSIA, the rms pIC(50) error and error factors were 0.35 and 2.2, respectively. In general, the most active compounds contained both a single aromatic ring and a hydrogen bond donor feature. Thirteen of the more potent compounds were then tested in vivo in a mouse model of T. brucei infection. The most active compound in vivo provided a 40% protection from death with no apparent side effects, suggesting that further development of such compounds may be of interest.
Bisphosphonate Inhibition of the Exopolyphosphatase Activity of the Trypanosoma brucei Soluble Vacuolar Pyrophosphatase
摘要:
Trypanosoma brucei, the causative agent of African trypanosomiasis, contains a soluble, vacuolar pyrophosphatase, TbVSP1, not present in humans, which is essential for the growth of bloodstream forms in their mammalian host. Here, we report the inhibition of a recombinant TbVSP1 expressed in Escherichia coli by a panel of 81 bisphosphonates. The IC50 values were found to vary from similar to 2 to 850 mu M. We then used 3D QSAR (comparative molecular field and comparative molecular similarity index; CoMFA and CoMSIA) methods to analyze the enzyme inhibition results. The R-2 values for the experimental versus the QSAR-predicted activities were 0.78 or 0.61 for CoMFA and 0.79 or 0.68 for CoMSIA, for two different alignments. The root-mean-square (rms) pIC(50) error for the best CoMFA model was 0.41 for five test sets of five activity predictions, which translates to a factor of similar to 2.6 error in IC50 prediction. For CoMSIA, the rms pIC(50) error and error factors were 0.35 and 2.2, respectively. In general, the most active compounds contained both a single aromatic ring and a hydrogen bond donor feature. Thirteen of the more potent compounds were then tested in vivo in a mouse model of T. brucei infection. The most active compound in vivo provided a 40% protection from death with no apparent side effects, suggesting that further development of such compounds may be of interest.
Efficient construction of diverse 3-cyanoindoles under novel tandem catalysis
作者:Jun Wu、Jiabin Liu、Kerui Zhou、Zhenni He、Qian Wang、Fen Wu、Tingting Miao、Jinjie Qian、Qian Shi
DOI:10.1039/d0cc05439a
日期:——
unprotected, N-alkyl and N-aryl 3-cyanoindoles are obtained with good to excellent yields. The usefulness of this synthetic approach is further demonstrated by the successful synthesis of practical compounds such as the therapeutic estrogen receptor ligand A precursor. Mechanism study shows that the tandem catalysis exploits a Suzuki cross-coupling with subsequent base-induced isoxazole fragmentation, followed
Lanthanide-Catalyzed Tandem Addition of Amines to Cyanoalkenes: Synthesis of Cyclic Amidines
作者:Jinsong Hou、Gaosheng Yang、Zhuo Chai
DOI:10.1021/acs.joc.1c02481
日期:2022.1.7
A tandem insertion of aliphatic nitriles and unactivated alkenes to the N–H bond of secondary aliphatic amines catalyzed by simple trialkyl rare-earth metal complexes was disclosed. This reaction provides a highly atom-economic and stereoselective way to a range of cyclic amidines under mild reaction conditions.
Chemodivergent C(sp3)–H and C(sp2)–H cyanomethylation using engineered carbene transferases
作者:Juner Zhang、Ailiena O. Maggiolo、Edwin Alfonzo、Runze Mao、Nicholas J. Porter、Nayla M. Abney、Frances H. Arnold
DOI:10.1038/s41929-022-00908-x
日期:——
The ubiquity of C–H bonds presents an opportunity to efficiently elaborate and build complexity in organic molecules. Methods for selective functionalization, however, must differentiate among multiple, chemically similar C–H bonds: enzymes are attractive because they can be finely tuned using directed evolution to achieve divergentreaction outcomes. Here we present engineered enzymes that effect
Novel cationic nitriles, methods of preparing such nitriles and use thereof as cationic peroxyacid bleach precursor in bleaching (detergent) compositons are disclosed.
The novel cationic nitriles are non-hygroscopic and are characterized in that they have a counter-anion X-selected from the group consisting of 1) R-SO3-, 2) R-SO4-, 3) R-CO2-, wherein R is a straight or branched chain, optionally substituted, alkyl, alkylether or alkylene group containing 4 to 20 carbon atoms, or a phenyl or alkyl phenyl group containing 6 to 20 carbon atoms, and 4) any other surfactant anion not falling under the groups 1), 2) and 3).
Identification Of A Nitrilase From B. Japonicum By Rational Genome Mining And Methods Of Use
申请人:Zhu Dunming
公开号:US20070178575A1
公开(公告)日:2007-08-02
The present disclosure relates to methods of rational genome mining. A method may include narrowing the number of clones that would otherwise need to be screened and/or identifying a gene with a desired catalytic activity. The disclosure also relates to a nitrile hydrolase from
Bradyrhizobium japonicum
USDA110 first identified by rational genome mining. In addition, the disclosure relates to nitrilase bll6402 and catalytically active variants capable of converting an α-hydroxy nitriles, a β-hydroxy nitrile and/or an α,ω-dinitrile to a carboxylic acid.