Identification of antisense RNA stem-loops that inhibit RNA-protein interactions using a bacterial reporter system.
Many well-characterized examples of antisense RNAs from prokaryotic systems involve hybridization of the looped regions of stem-loop RNAs, presumably due to the high thermodynamic stability of the resulting loop-loop and loop-linear interactions. In this study, the identification of RNA stem-loops that inhibit U1A protein binding to the hpII RNA through RNA-RNA interactions was attempted using a bacterial reporter system based on phage lambda N-mediated antitermination. As a result, loop sequences possessing 7-8 base complementarity to the 5' region of the boxA element important for functional antitermination complex formation, but not the U1 hpII loop, were identified. In vitro and in vivo mutational analysis strongly suggested that the selected loop sequences were binding to the boxA region, and that the structure of the antisense stem-loop was important for optimal inhibitory activity. Next, in an attempt to demonstrate the ability to inhibit the interaction between the U1A protein and the hpII RNA, the rational design of an RNA stem-loop that inhibits U1A-binding to a modified hpII was carried out. Moderate inhibitory activity was observed, showing that it is possible to design and select antisense RNA stem-loops that disrupt various types of RNA-protein interactions.
Department of Life Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan.
Akiko
A
Yano
Satoru
S
Horiya
Takako
T
Minami
Eri
E
Haneda
Makiko
M
Ikeda
Kazuo
K
Harada
D001419:Bacteria / Q000235:genetics; D017930:Genes, Reporter; D009154:Mutation; D009690:Nucleic Acid Conformation; D016372:RNA, Antisense / Q000737:chemistry*; D012342:RNA, Small Nuclear / Q000737:chemistry* / Q000378:metabolism; D038621:Regulatory Sequences, Ribonucleic Acid; D017412:Ribonucleoprotein, U1 Small Nuclear / Q000737:chemistry* / Q000378:metabolism; D054334:Viral Regulatory and Accessory Proteins / Q000378:metabolism
C059417:N protein, Bacteriophage lambda; D016372:RNA, Antisense; D012342:RNA, Small Nuclear; D038621:Regulatory Sequences, Ribonucleic Acid; D017412:Ribonucleoprotein, U1 Small Nuclear; C405483:U1 small nuclear RNA; C075339:U1A protein; D054334:Viral Regulatory and Accessory Proteins