Selective inhibition of ADAR2-catalyzed editing of the serotonin 2c receptor pre-mRNA by a helix-threading peptide
作者:Nicole T. Schirle、Rena A. Goodman、Malathy Krishnamurthy、Peter A. Beal
DOI:10.1039/c0ob00309c
日期:——
RNA editing by adenosine deamination is a form of epigenetic control of gene expression wherein the ADAR enzymes convert adenosine to inosine in RNA often changing the meaning of codons. The pre-mRNA for the 2c subtype of serotonin receptor (5-HT2cR) is shown here to support small molecule binding near known editing sites. Furthermore, a helix-threading peptide binds this site and inhibits the in vitro reaction of ADAR2 in an RNA-substrate selective manner. This is the first example of substrate-selective inhibition of editing by an RNA-binding small molecule and sets the stage for the development of new reagents capable of controlling gene function through manipulation of mRNA editing.
Binding the anion: A highly enantioselectiveiodolactonization of 5‐hexenoic acids has been achieved using a tertiary aminourea‐catalyst (see scheme). The use of catalytic iodine in this process is critical to enhancing both the reactivity and enantioselectivity of the stoichiometric I+ source. The mechanism is proposed to involve binding of an iodonium imidate intermediate by the H‐bond donor catalyst
结合阴离子:使用叔氨基脲催化剂实现了 5-己烯酸的高度对映选择性碘内酯化(参见方案)。在该过程中使用催化碘对于提高化学计量 I +源的反应性和对映选择性至关重要。该机制被认为涉及通过氢键供体催化剂结合亚胺酸碘鎓中间体。