Electrophilic derivatives of purines as irreversible inhibitors of A1 adenosine receptors
摘要:
Functionalized congeners derived from 1,3-dipropyl-8-phenylxanthine and from N6-phenyladenosine were derivatized to contain electrophilic groups (isothiocyanate, N-hydroxysuccinimide ester, maleimide, sulfonyl chloride, or alpha-haloacyl group) capable of reaction with nucleophiles on biopolymers. The goal was to inhibit chemically the A1 adenosine receptor by using reactive agonist and antagonist ligands. Some of the electrophilic derivatives were synthesized through acylation of amine-functionalized congeners using hetero- or homobifunctional reagents available for protein cross-linking. The affinity for A1 adenosine receptors was evaluated in competitive binding assays by using rat and bovine brain membranes. Several xanthine and adenosine thiourea derivatives prepared from 1,3- and 1,4-phenylene diisothiocyanate (DITC) were potent irreversible inhibitors of adenosine receptors. Derivatives of m-DITC, at concentrations between 10 and 500 nM, irreversibly eliminated binding at 90% of the A1-receptor sites. Receptor affinity of both xanthine and adenosine derivatives containing distal phenylthiourea substituents was diminished by electron-donating groups on the ring.
Electrophilic derivatives of purines as irreversible inhibitors of A1 adenosine receptors
摘要:
Functionalized congeners derived from 1,3-dipropyl-8-phenylxanthine and from N6-phenyladenosine were derivatized to contain electrophilic groups (isothiocyanate, N-hydroxysuccinimide ester, maleimide, sulfonyl chloride, or alpha-haloacyl group) capable of reaction with nucleophiles on biopolymers. The goal was to inhibit chemically the A1 adenosine receptor by using reactive agonist and antagonist ligands. Some of the electrophilic derivatives were synthesized through acylation of amine-functionalized congeners using hetero- or homobifunctional reagents available for protein cross-linking. The affinity for A1 adenosine receptors was evaluated in competitive binding assays by using rat and bovine brain membranes. Several xanthine and adenosine thiourea derivatives prepared from 1,3- and 1,4-phenylene diisothiocyanate (DITC) were potent irreversible inhibitors of adenosine receptors. Derivatives of m-DITC, at concentrations between 10 and 500 nM, irreversibly eliminated binding at 90% of the A1-receptor sites. Receptor affinity of both xanthine and adenosine derivatives containing distal phenylthiourea substituents was diminished by electron-donating groups on the ring.
Photoredox‐Catalyzed Labeling of Hydroxyindoles with Chemoselectivity (PhotoCLIC) for Site‐Specific Protein Bioconjugation
作者:Soumya Jyoti Singha Roy、Conor Loynd、Delilah Jewel、Sarah E. Canarelli、Elise D. Ficaretta、Quan A. Pham、Eranthie Weerapana、Abhishek Chatterjee
DOI:10.1002/anie.202300961
日期:2023.7.3
bioconjugation reaction, PhotoCLIC, has been developed for chemoselective attachment of aromatic amines onto a 5-hydroxytryptophan (5HTP) residue site-specifically preinstalled in a full-length protein using genetic code expansion technology. PhotoCLIC has a wide substrate scope and is compatible with the strain-promoted azide-alkyne cycloaddition to enable site-specific dual-labeling of target proteins.
[EN] A CHEMOSELECTIVE PHOTOCHEMICAL BIOCONJUGATION REACTION AND METHODS OF USE THEREOF<br/>[FR] RÉACTION DE BIOCONJUGAISON PHOTOCHIMIQUE CHIMIOSÉLECTIVE ET SES PROCÉDÉS D'UTILISATION
申请人:TRUSTEES BOSTON COLLEGE
公开号:WO2023205769A1
公开(公告)日:2023-10-26
Described herein is a visible light enabled photocatalytic oxidative protein bioconjugation reaction directed towards site-specifically incorporating non-canonical amino acids (ncAA).