From the RasMol manual, which is available online at www.rasmol.org: SSBonds Syntax: ssbonds {<boolean>} ssbonds <value> The RasMol ssbonds command is used to represent the disulphide bridges of the protein molecule as either dotted lines or cylinders between the connected cysteines. The first time that the ssbonds command is used, the program searches the structure of the protein to find half-cysteine pairs (cysteines whose sulphurs are within 3 Angstroms of each other) and reports the number of bridges to the user. The command ssbonds on displays the selected bonds as dotted lines, and the command ssbonds off disables the display of ssbonds in the currently selected area. Selection of disulphide bridges is identical to normal bonds, and may be adjusted using the RasMol set bondmode command. The colour of disulphide bonds may be changed using the colour ssbonds command. By default, each disulphide bond has the colours of its connected atoms. By default disulphide bonds are drawn between the sulphur atoms within the cysteine groups. By using the set ssbonds command the position of the cysteine's alpha carbons may be used instead. ===================================================== Herbert J. Bernstein, Professor of Computer Science Dowling College, Kramer Science Center, KSC 121 Idle Hour Blvd, Oakdale, NY, 11769 +1-631-244-3035 yaya at dowling.edu ===================================================== On Tue, 14 Mar 2006, Nanjiang Shu wrote: > Hello, > > I have a question about the ssbond function in Rasmol. > > For protein with PDB code "1AOL", when typing SS-bond, it shows there > are 6 > SS bridges, and the distance between bonded sulfur atoms is around 2 Å. > However, both PDB file and DSSP file do not indicate there are any > SS-bonds > for that protein. What scheme does Rasmol use to determine whether > there is > an SS-bond or not? Something other than DSSP and PDB file? > > Thanks very much. > > Yours sincerely, > Nanjiang S > > ------------------------------ > Nanjiang Shu, PhD > Structural Chemistry > Stockholm University > Sweden > > _______________________________________________ > Molvis-list mailing list > Molvis-list at bioinformatics.org > https://bioinformatics.org/mailman/listinfo/molvis-list >