have studied the sequence dependent binding of 2-amino-1,8-naphthyridine derivative 1 to a single guanine bulge. The free energy changes for the binding to a guanine bulge with different sequence contexts (5'X_Y3'/3'X'GY'5') were determined by a curve fitting of the thermal denaturation profile of DNA in the presence and absence of 1. The data showed that (i) the binding of 1 to a guanine bulge is stronger
Synthesis and evaluation of fluorogenic 2-amino-1,8-naphthyridine derivatives for the detection of bacteria
作者:Linda Váradi、Mark Gray、Paul W. Groundwater、Andrew J. Hall、Arthur L. James、Sylvain Orenga、John D. Perry、Rosaleen J. Anderson
DOI:10.1039/c2ob06986e
日期:——
Several novel fluorogenic N-aminoacylnaphthyridine substrates were synthesized in good yield and tested for their ability to detect pathogenic bacteria in agar-based cell culture. Simple 2-N-(β-alanyl)amino-5,7-dialkylnaphthyridine substrates were selectively hydrolysed by β-alanylaminopeptidase expressing bacteria, but were subject to diffusion in the agar medium. Diffusion was reduced in the 2-N-(β-alanyl)amino-7-alkylnaphthyridine substrates with longer alkyl chains, but inhibition of growth was increased. 2-N-(β-Alanyl)amino-7-octylnaphthyridine inhibited the growth of all species tested, except for strains resistant to colistin/polymyxin, providing a rationale for the development of substrates for the selective detection of drug resistant species in clinical samples.
作者:Paul Watts、Charlotte Wiles、Stephen J. Haswell、Esteban Pombo-Villar、Peter Styring
DOI:10.1039/b102125g
日期:——
We have demonstrated the first application of multi-step
synthesis within a micro reactor and have shown that peptides may be
prepared in quantitative yield in a period of 20 min, compared with batch
reactions where only moderate yields (40–50%) were obtained in a 24 h
period.
Photoswitchable DNA-binding ligands should be useful for controlling diverse biological functions involving DNA and reversible assembly of DNA-based nanostructures. In work directed towards the development of photoswitchableligands with various sequence specificities, we have elaborated an efficient synthesis of photoswitchableunsymmetricalligands possessing pairs of different base recognition elements
small molecules that bind to CTG trinucleotiderepeats in DNA. 1H-Pyrrolo[3,2-h]quinoline-8-amine (PQA) has a tricyclic aromatic system with unique non-linear hydrogen-bonding surface complementary to thymine. We have synthesized a series of PQA derivatives with different alkylamino linkers. These PQAs showed binding to pyrimidine bulge DNAs and CNG (N = T and C) repeats depending on the linker structure
我们描述了一种新的分子设计,合成以及与DNA中CTG三核苷酸重复序列结合的小分子的研究。1 H-吡咯并[3,2- h ]喹啉-8-胺(PQA)具有三环芳族体系,其独特的非线性氢键表面与胸腺嘧啶互补。我们合成了一系列具有不同烷基氨基接头的PQA衍生物。这些PQA显示与嘧啶凸出的DNA结合,并且CNG(N = T和C)重复序列取决于接头结构,而缺少吡咯环的喹啉衍生物显示出更低的结合亲和力。PQA是CTG和CCG重复结合的有用分子单元。