Abstract
A set of programs written in C language with the GL library and under UNIX has been developed for generating compact, pleasant and non-overlapping displays of secondary structures of ribonucleic acids. The first program, rnasearch, implements a new search procedure that dynamically rearranges overlapping portions of the two-dimensional drawing while preserving clear and readable displays of the two-dimensional structure. The algorithm is fast (the execution time for the command rnasearch is 38.6 s for the 16S rRNA of Escherichia coli with 1542 bases), accepts outputs from two-dimensional prediction programs and therefore allows for rapid comparison between the various two-dimensional folds generated. A second program, rnadisplay, allows the graphical display of the computed two-dimensional structures on a graphics workstation. Otherwise, it is possible to obtain a paper output of the two-dimensional structure by using the program print2D which builds a Postscript file. Moreover the two-dimensional drawing can be labelled for representing data coming from chemical modifications and/or enzymatic cleavages. Application to a few secondary structures such as RNaseP, 5S rRNA and 16S rRNA are given.
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