7354-93-0Relevant articles and documents
Novel bisubstrate uridine-peptide analogues bearing a pyrophosphate bioisostere as inhibitors of human O-GlcNAc transferase
Ryan, Philip,Shi, Yun,von Itzstein, Mark,Rudrawar, Santosh
, (2021/03/06)
Protein O-linked β-D-N-acetylglucosamine (O-GlcNAc) modification (O-GlcNAcylation), an essential post-translational as well as cotranslational modification, is the attachment of β-D-N-acetylglucosamine to serine and threonine residues of nucleocytoplasmic proteins. An aberrant O-GlcNAc profile on certain proteins has been implicated in metabolic diseases such as diabetes and cancer. Inhibitors of O-GlcNAc transferase (OGT) are valuable tools to study the cell biology of protein O-GlcNAc modification. In this study we report novel uridine-peptide conjugate molecules composed of an acceptor peptide covalently linked to a catalytically inactive donor substrate analogue that bears a pyrophosphate bioisostere and explore their inhibitory activities against OGT by a radioactive hOGT assay. Further, we investigate the structural basis of their activities via molecular modelling, explaining their lack of potency towards OGT inhibition.
Tightly linked morpholino-nucleoside chimeras: new, compact cationic oligonucleotide analogues
Batta, Gyula,Bege, Miklós,Bereczki, Ilona,Borbás, Anikó,Debreczeni, Nóra,Herczeg, Mihály,Herczegh, Pál
, p. 8711 - 8721 (2021/10/22)
The polyanionic phosphodiester backbone of nucleic acids contributes to high nuclease sensitivity and low cellular uptake and is therefore a major obstacle to the biological application of native oligonucleotides. Backbone modifications, particularly charge alterations is a proven strategy to provide artificial oligonucleotides with improved properties. Here, we describe the synthesis of a new type of oligonucleotide analogues consisting of a morpholino and a ribo- or deoxyribonucleoside in which the 5′-amino group of the nucleoside unit provides the nitrogen of the morpholine ring. The synthetic protocol is compatible with trityl and dimethoxytrityl protecting groups and azido functionality, and was extended to the synthesis of higher oligomers. The chimeras are positively charged in aqueous medium, due to theN-alkylated tertiary amine structure of the morpholino unit.
Deploying Fluorescent Nucleoside Analogues for High-Throughput Inhibitor Screening
Seebald, Leah,Madec, Ama?l G. E.,Imperiali, Barbara
, p. 108 - 112 (2019/12/12)
High-throughput small-molecule screening in drug discovery processes commonly rely on fluorescence-based methods including fluorescent polarization and fluorescence/F?rster resonance energy transfer. These techniques use highly accessible instrumentation; however, they can suffer from high false-negative rates and background signals, or might involve complex schemes for the introduction of fluorophore pairs. Herein we present the synthesis and application of fluorescent nucleoside analogues as the foundation for directed approaches for competitive binding analyses. The general approach describes selective fluorescent environment-sensitive (ES) nucleoside analogues that are adaptable to diverse enzymes that act on nucleoside-based substrates. We demonstrate screening a set of uridine analogues and development of an assay for fragment-based lead discovery with the TcdB glycosyltransferase (GT), an enzyme associated with virulence in Clostridium difficile. The uridine-based probe used for this high-throughput screen has a KD value of 7.2 μm with the TcdB GT and shows a >30-fold increase in fluorescence intensity upon binding. The ES-based probe assay is benchmarked against two other screening approaches.
