Comprehensive Thermodynamic Analysis of 3' Double-nucleotide Overhangs Neighboring Watson-Crick Terminal Base Pairs

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 2006 Jul 6

PMID 16820533

Citations 51

Authors

Amanda S OToole

Stacy Miller

Nathan Haines

M Coleen Zink

Martin J Serra

Affiliations

Soon will be listed here.

Abstract

Thermodynamic parameters are reported for duplex formation of 48 self-complementary RNA duplexes containing Watson-Crick terminal base pairs (GC, AU and UA) with all 16 possible 3' double-nucleotide overhangs; mimicking the structures of short interfering RNAs (siRNA) and microRNAs (miRNA). Based on nearest-neighbor analysis, the addition of a second dangling nucleotide to a single 3' dangling nucleotide increases stability of duplex formation up to 0.8 kcal/mol in a sequence dependent manner. Results from this study in conjunction with data from a previous study [A. S. O'Toole, S. Miller and M. J. Serra (2005) RNA, 11, 512.] allows for the development of a refined nearest-neighbor model to predict the influence of 3' double-nucleotide overhangs on the stability of duplex formation. The model improves the prediction of free energy and melting temperature when tested against five oligomers with various core duplex sequences. Phylogenetic analysis of naturally occurring miRNAs was performed to support our results. Selection of the effector miR strand of the mature miRNA duplex appears to be dependent upon the identity of the 3' double-nucleotide overhang. Thermodynamic parameters for 3' single terminal overhangs adjacent to a UA pair are also presented.

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