Versatile Site-Specific Conjugation of Small Molecules to siRNA Using Click Chemistry
摘要:
We have previously demonstrated that conjugation of small molecule ligands to small interfering RNAs (siRNAs) and anti-microRNAs results in functional siRNAs and antagomirs in vivo. Here we report on the development of an efficient chemical strategy to make oligoribonucleotide-ligand conjugates using the copper-catalyzed azide-alkyne cycloaddition (CuAAC) or click reaction. Three click reaction approaches were evaluated for their feasibility and suitability for high-throughput synthesis: the CuAAC reaction at the monomer level prior to oligonucleotide synthesis, the solution-phase postsynthetic "click conjugation", and the "click conjugation" on an immobilized and cornpletely protected alkyne-oligonucleotide scaffold. Nucleosides bearing 5'-alkyne moieties were used for conjugation to the 5'-end of the oligonucleotide. Previously described 2'- and 3'-O-propargylated nucleosides were prepared to introduce the alkyne moiety to the 3' and 5' termini and to the internal positions of the scaffold. Azido-functionalized ligands bearing lipophilic long chain alkyls, cholesterol, oligoamine, and carbohydrate were utilized to study the effect of physicochemical characteristics of the incoming azide on click conjugation to the alkyne-oligonucleotide scaffold in solution and on immobilized solid support. We found that microwave-assisted click conjugation of azido-functionalized ligands to a fully protected solid-support bound alkyne-oligonucleotide prior to deprotection was the most efficient "click conjugation" strategy for site-specific, high-throughput oligonucleotide conjugate synthesis tested. The siRNA conjugates synthesized using this approach effectively silenced expression of a luciferase gene in a stably transformed HeLa cell line.
CHEMICAL MODIFICATIONS OF MONOMERS AND OLIGONUCLEOTIDES WITH CYCLOADDITION
申请人:Manoharan Muthiah
公开号:US20120035115A1
公开(公告)日:2012-02-09
The invention features compounds of formula I or II:
In one embodiment, the invention relates compounds and processes for conjugating ligand to oligonucleotide. The invention further relates to methods for treating various disorders and diseases such as viral infections, bacterial infections, parasitic infections, cancers, allergies, autoimmune diseases, immunodeficiencies and immunosuppression.
Synthesis and biological evaluation of 1,6-bis-triazole-2,3,4-tri-O-benzyl-α-d-glucopyranosides as a novel α-glucosidase inhibitor in the treatment of Type 2 diabetes
A novel series of 1,6-bis-triazole-benzyl-α-glucoside derivatives (7a-7ee) were designed, synthesized and evaluated for inhibitory activity against α-glucosidase. Most of the synthesized compounds exhibited good activity with IC50 ranging from 3.73 µM to 53.34 µM and are more potent than the standard drug acarbose (IC50 = 146.25 ± 0.40 µM). SARs study showed the ester and menthol moiety play an important
In Situ Lipid Membrane Formation Triggered by Intramolecular Photoinduced Electron Transfer
作者:Takafumi Enomoto、Roberto J. Brea、Ahanjit Bhattacharya、Neal K. Devaraj
DOI:10.1021/acs.langmuir.7b02783
日期:2018.1.23
from purely synthetic components. However, spatiotemporal control of artificial membrane formation remains both challenging and limited in scope. Here, we describe a new methodology to promote biomimetic phospholipid membrane formation by the photochemical activation of a catalyst-sensitizer dyad via an intramolecular photoinduced electron-transfer process. Our results offer future opportunities to exert
Spontaneous Reconstitution of Functional Transmembrane Proteins During Bioorthogonal Phospholipid Membrane Synthesis
作者:Christian M. Cole、Roberto J. Brea、Young Hun Kim、Michael D. Hardy、Jerry Yang、Neal K. Devaraj
DOI:10.1002/anie.201504339
日期:2015.10.19
Transmembraneproteins are critical for signaling, transport, and metabolism, yet their reconstitution in synthetic membranes is often challenging. Non‐enzymatic and chemoselective methods to generate phospholipidmembranes in situ would be powerful tools for the incorporation of membraneproteins. Herein, the spontaneousreconstitution of functional integral membraneproteinsduring the de novo synthesis
membranes. In addition to the bioengineered post-translational modifications of genetically encoded recombinant ELPs developed so far, we report here a simple and versatile method to design biohybrid brush-like lipid-grafted-ELPs using chemical post-modification reactions. We have explored a combination of methionine alkylation and clickchemistry to create a new class of hybrid lipoprotein mimics. Our design