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Characterization of the structure and melting behavior of the loop I fragment of ColE1 RNA I.
- Source :
-
Journal of biomolecular structure & dynamics [J Biomol Struct Dyn] 1996 Feb; Vol. 13 (4), pp. 677-85. - Publication Year :
- 1996
-
Abstract
- We have synthesized two RNA fragments: a 42-mer corresponding to the full loop I sequence of the loop I region of ColE1 antisense RNA (RNA I), plus three additional Gs at the 5'-end, and a 31-mer which has 11 5'-end nucleotides (G(-2)-U9) deleted. The secondary structure of the 42-mer, deduced from one- and two-dimensional NMR spectra, consists of a stem of 11 base-pairs which contains a U-U base-pair and a bulged C base, a 7 nucleotide loop, and a single-stranded 5' end of 12 nucleotides. The UV-melting study of the 42-mer further revealed a multi-step melting behavior with transition temperatures 32 degrees C and 71 degrees C clearly discernible. In conjunction with NMR melting study the major transition at 71 degrees C is assigned to the overall melting of the stem region and the 32 degrees C transition is assigned to the opening of the loop region. The deduced secondary structure agrees with that proposed for the intact RNA I and provides structural bases for understanding the specificity of RNase E.
Details
- Language :
- English
- ISSN :
- 0739-1102
- Volume :
- 13
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Journal of biomolecular structure & dynamics
- Publication Type :
- Academic Journal
- Accession number :
- 8906888
- Full Text :
- https://doi.org/10.1080/07391102.1996.10508880