Structurally diverse low molecular weight activators of the mammalian pre-mRNA 3′ cleavage reaction
摘要:
The 3' end formation of mammalian pre-mRNA contributes to gene expression regulation by setting the downstream boundary of the 3' untranslated region, which in many genes carries regulatory sequences. A large number of protein cleavage factors participate in this pre-mRNA processing step, but chemical tools to manipulate this process are lacking. Guided by a hypothesis that a PPM1 family phosphatase negatively regulates the 3' cleavage reaction, we have found a variety of new small molecule activators of the in vitro reconstituted pre-mRNA 3' cleavage reaction. New activators include a cyclic peptide PPM1D inhibitor, a dipeptide with modifications common to histone tails, abscisic acid and an improved L-arginine beta-naphthylamide analog. The minimal concentration required for in vitro cleavage has been improved from 200 mu M to the 200 nM-100 mu M range. These compounds provide unexpected leads in the search for small molecule tools able to affect pre-mRNA 3' end formation. (C) 2013 Elsevier Ltd. All rights reserved.
Unprecedented 1,1′-Carbonyldiimidazole-Mediated Amidation of Unprotected α-Amino Acids in Water
作者:Rahul Jain、Rohit Sharma
DOI:10.1055/s-2007-967965
日期:——
The first amidation reaction of unprotected α-aminoacids in water under neutral conditions with various aliphatic, aromatic and heteroaromatic amines in the presence of coupling reagent 1,1 '-carbonyldiimidazole at ambient temperature is described.
Substrates for determination of enzyme activity and intermediates for synthesis of the substrates as well as process for producing the intermediates
申请人:NITTO BOSEKI CO., LTD.
公开号:EP0347734A2
公开(公告)日:1989-12-27
Novel compounds represented by the following formula:
wherein A and B each represents a specific amino acid residue and X represents hydrogen or a specific substituent, are excellent as substrates for determination of enzyme activity such as trypsin, etc. The compounds can be synthesized from novel arginyl-3-tert-alkyloxycarbonyl-4-nitroanilides.
下式所代表的新型化合物:
其中 A 和 B 各代表一个特定的氨基酸残基,X 代表氢或一个特定的取代基,是测定胰蛋白酶等酶活性的极佳底物。这些化合物可由新型精氨酰-3-叔烷氧基羰基-4-硝基苯胺合成。
Zur Aktivität und Spezifität der Leucinaminopeptidase in Augenlinsen. Aminosäure- und Dipeptidanilide als Substrate