Nucleic Acids Research, 1981, Vol. 9, No. 19 5125-5140
© 1981
MOLECULAR BIOLOGY |
Mapping tRNA structure in solution using double-strand-specific ribonuclease V1 from cobra venom
Department of Biochemistry, The George Washington University School of Medicine and Health Sciences 2300 Eye Street, N.W., Washington, DC 20037, USA
A method for mapping all base-paired stems in both elongation and initiator tRNAs is described using double-strand-specific ribonuclease V1 from the venom of the cobra Naja naja oxiana. 32p-end-labeled RNA is first partially digested with double-strand-specific V1 nuclease under near physiological conditions, and the resultant fragments are then electrophoretically fractionated by size in adjacent lanes of a polyacrylamide gel run in 90% formamide. After autoradiography, the base-paired nucleotides are definitively located by comparing V1 generated bands with fragments of known length produced by both Neurospora endonuclease and base-specific ribonucleases. Using the substrates yeast tRNAPhe and E. coli tRNAMet of known three-dimensional structure, we find V1 nuclease to cleave entirely within every base-paired stem. Our studies also reveal that nuclease V1 will digest paired nucleotides not hydrogen-bonded by standard Watson-Crick base-pairing. In yeast tRNAPhe cleavage of both wobble base-pairs and nucleotides involved in tertiary base-base hydrogen bonding is demonstrated.
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