title: Rapid preparation of RNA samples for NMR spectroscopy and X-ray crystallography.
abstract: Knowledge of the three-dimensional structures of RNA and its complexes is important for understanding the molecular mechanism of RNA recognition by proteins or ligands. Enzymatic synthesis using T7 bacteriophage RNA polymerase is used to prepare samples for NMR spectroscopy and X-ray crystallography. However, this run-off transcription method results in heterogeneity at the RNA 3-terminus. For structural studies, RNA purification requires a single nucleotide resolution. Usually PAGE purification is used, but it is tedious, time-consuming and cost ineffective. To overcome these problems in high-throughput RNA synthesis, we devised a method of RNA preparation that uses trans-acting DNAzyme and sequence-specific affinity column chromatography. A tag sequence is added at the 3' end of RNA, and the tagged RNA is picked out using an affinity column that contains the complementary DNA sequence. The 3' end tag is then removed by sequence-specific cleavage using trans-acting DNAzyme, the arm lengths of which are optimized for turnover number. This purification method is simpler and faster than the conventional method.
authors.affiliation: Magnetic Resonance Team, Korea Basic Science Institute, Eoun-dong 52, Yuseong-gu, Daejeon 305-333, Korea.
authors.forename: Hae-Kap
authors.initials: HK
authors.lastname: Cheong
authors.forename: Eunha
authors.initials: E
authors.lastname: Hwang
authors.forename: Chulhyun
authors.initials: C
authors.lastname: Lee
authors.forename: Byong-Seok
authors.initials: BS
authors.lastname: Choi
authors.forename: Chaejoon
authors.initials: C
authors.lastname: Cheong
mesh_terms: D001483:Base Sequence; D002846:Chromatography, Affinity; D018360:Crystallography, X-Ray; D021881:DNA, Catalytic / Q000378:metabolism; D004259:DNA-Directed DNA Polymerase / Q000378:metabolism; D019906:Nuclear Magnetic Resonance, Biomolecular; D009841:Oligonucleotides / Q000737:chemistry; D012313:RNA / Q000096:biosynthesis / Q000302:isolation & purification*; D013997:Time Factors; D014158:Transcription, Genetic
chemical_list: D021881:DNA, Catalytic; D009841:Oligonucleotides; D012313:RNA; C034970:bacteriophage T7 induced DNA polymerase; D004259:DNA-Directed DNA Polymerase