title: A small molecule microarray platform to select RNA internal loop-ligand interactions.
abstract: Herein, we report the development of a microarray platform to select RNA motif-ligand interactions that allows simultaneous screening of both RNA and chemical space. We used this platform to identify the RNA internal loops that bind 6'- N-5-hexynoate kanamycin A ( 1). Selected internal loops that bind 1 were studied in detail and commonly display an adenine across from a cytosine independent of the size of the loop. Additional preferences are also observed. For 3 x 3 nucleotide loops, there is a preference for purines, and for 2 x 2 nucleotide loops there is a preference for pyrimidines neighbored by an adenine across from a cytosine. This technique has several advantageous features for selecting RNA motif-ligand interactions: (1) higher affinity RNA motif-ligand interactions are identified by harvesting bound RNAs from lower ligand loadings; (2) bound RNAs are harvested from the array via gel extraction, mitigating kinetic biases in selections; and (3) multiple selections are completed on a single array surface. To further demonstrate that multiple selections can be completed in parallel on the same array surface, we selected the RNA internal loops from a 4096-member RNA internal loop library that bound a four-member aminoglycoside library. These experiments probed 16,384 (4 aminoglycoside x 4096-member RNA library) interactions in a single experiment. These studies allow for parallel screening of both chemical and RNA space to improve our understanding of RNA-ligand interactions. This information may facilitate the rational and modular design of small molecules targeting RNA.
authors.affiliation: Department of Chemistry and Center of Excellence in Bioinformatics and Life Sciences, University at Buffalo, 657 Natural Sciences Complex, Buffalo, New York 14260, USA.
authors.forename: Jessica L
authors.initials: JL
authors.lastname: Childs-Disney
authors.forename: Meilan
authors.initials: M
authors.lastname: Wu
authors.forename: Alexei
authors.initials: A
authors.lastname: Pushechnikov
authors.forename: Olga
authors.initials: O
authors.lastname: Aminova
authors.forename: Matthew D
authors.initials: MD
authors.lastname: Disney
mesh_terms: D001483:Base Sequence; D007612:Kanamycin / Q000378:metabolism; D008024:Ligands; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D012313:RNA / Q000737:chemistry* / Q000378:metabolism
chemical_list: D008024:Ligands; D007612:Kanamycin; D012313:RNA