Direct PCR amplification of various modified DNAs having amino acids: Convenient preparation of DNA libraries with high-potential activities for in vitro selection
摘要:
We synthesized modified 2'-deoxyuridine triphosphates bearing amino acids at the C5 position and investigated their substrate properties for KOD Dash DNA polymerase during polymerase chain reaction (PCR). PCR using C5-modified dUTP having an amino acyl group (arginyl, histidyl, lysyl, phenylalanyl, tryptophanyl, leucyl, prolyl, glutaminyl, seryl, O-benzyl seryl or threonyl group) gave the corresponding full-length PCR products in good yield. Although dUTP analogues bearing aspartyl, glutamyl or cysteinyl were found to be poor substrates for PCR catalyzed by KOD Dash DNA polymerase, optimization of the reaction conditions resulted in substantial generation of full-length product. In the case of reaction using dUTP analogue having a cysteinyl group, addition of a reducing agent improved the reaction yield. Thus, PCRs using KOD Dash DNA polymerase together with amino acyl dUTP provide convenient and efficient preparation of various modified DNA libraries with potential protein-like activities. (c) 2005 Elsevier Ltd. All rights reserved.
two‐step strategy for thiopeptide bond formation with readily available monothiocarboxylic acids as thioacyl donors is described. The α‐thioacyloxyenamide intermediates formed from the ynamides and monothiocarboxylic acids can be purified, characterized, and stored. The balance between their activity and stability enables them to act as effective thioacylating reagents to afford thiopeptide bonds under mild
(Z) tripeptideinhibitors of angiotensin-convertingenzyme (ACE) was synthesized. The effect of varying the antepenultimate amino acid residue in this series on the biologicalactivity was studied. Introduction of Lys and Orn residues at the P1 position provided the most potent inhibitors, 25a and 25b (IC50: 3.5 and 4.9 x 10(-9) M, respectively), which exhibited an oral antihypertensive activity. This
合成了一系列新的含γ-D-Glu的血管紧张素转化酶(ACE)的N-苄氧基羰基(Z)三肽抑制剂。研究了改变该系列中前倒数第二个氨基酸残基对生物活性的影响。在P1位置引入Lys和Orn残基可提供最有效的抑制剂25a和25b(IC50:分别为3.5和4.9 x 10(-9)M),具有口服降压活性。该结果表明,在该系列中,P1位的碱性氨基酸残基在与ACE的S1亚位点的结合中起重要作用。评价了所选化合物的口服降压活性。
Site-specific chemoenzymatic protein modifications
申请人:Usera Aimee
公开号:US09359400B2
公开(公告)日:2016-06-07
The present invention relates to methods and reagents for use in site-selective modification of proteins having lysine residues with functionalized peptides using a chemoenzymatic microbial transglutaminase-mediated reaction. The functionalized proteins may be used for study or therapeutic uses.
Structure-Activity Study of 5-Substituted 1-Carbobenzoxy-2-iminohydantoins as Potential Anticonvulsant Agents
作者:Zhong-Yue Sun、Chul-Hoon Kwon、John N. D. Wurpel
DOI:10.1021/jm00044a003
日期:1994.9
compounds except 8 also showed activity against the scMET test with ED50 values in the range of 141-223 mg/kg. All significantly active compounds (1, 6, 7a, 8, 9, and 11) possessed aliphatic hydrocarbon side chains of two- to three-carbon lengths at the C5 position. All of the compounds with no or minimal activity had either shorter or longer side chains. The compounds substituted at the C5 position by
The antibiotic icosapeptide trichosporin B-V, which was isolated fromTrichodermapolysporum, was synthesized by assembling five peptide fragments via the N,N'-dicyclohexylcarbodiimide method. The synthesized peptide was identical with the natural one.