Nucleic Acids Research, 1990, Vol. 18, No. 10 3035
© 1990
MOLECULAR BIOLOGY |
Prediction of RNA secondary structure, including pseudoknotting, by computer simulation
1department of Biochemistry, Goriaeus Laboratories, University of Leiden PO Box 9502, 2300 RA Leiden 2lnstitute for Theoretical Biology, University of Leiden PO Box 9516, 2300 RA Leiden,The Netherlands
Received December 11, 1989. Accepted April 17, 1982.
A computer program is presented which determines the secondary structure of linear RNA molecules by simulating a hypothetical process of folding. This process implies the concept of lsquo;nucleation centres‘, regions in RNA which locally trigger the folding. During the simulation, the RNA is allowed to fold into pseudoknotted structures, unlike all other programs predicting RNA secondary structure. The simulation uses published, experimentally determined free energy values for nearest neighbour base pair stackings and loop regions, except for new extrapolated values for loops larger than seven nucleotides. The free energy value for a loop arising from pseudoknot formation is set to a single, estimated value of 4.2 kcal/mole. Especially in the case of long RNA sequences, our program appears superior to other secondary structure predicting programs described so far, as tests on tRNAs, the LSU intron of Tetrahymena thermophlla and a number of plant viral RNAs show. In addition, pseudoknotted structures are often predicted successfully. The program is written in mainframe APL and is adapted to run on IBM compatible PCs, Atari ST and Macintosh personal computers. On an 8 MHz 8088 standard PC without coprocessor, using STSC APL, it folds a sequence of 700 nucleotides in one and a half hour.
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