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gmx-do_dssp - Assign secondary structure and calculate solvent accessible surface area


gmx do_dssp [-f [<.xtc/.trr/...>]] [-s [<.tpr/.gro/...>]] [-n [<.ndx>]]
[-map [<.map>]] [-ssdump [<.dat>]] [-o [<.xpm>]]
[-sc [<.xvg>]] [-a [<.xpm>]] [-ta [<.xvg>]]
[-aa [<.xvg>]] [-b <time>] [-e <time>] [-dt <time>]
[-tu <enum>] [-[no]w] [-xvg <enum>] [-sss <string>]
[-ver <int>]


gmx do_dssp reads a trajectory file and computes the secondary structure for each time
frame calling the dssp program. If you do not have the dssp program, get it from
http://swift.cmbi.ru.nl/gv/dssp. gmx do_dssp assumes that the dssp executable is located
in /usr/local/bin/dssp. If this is not the case, then you should set an environment
variable DSSP pointing to the dssp executable, e.g.:

setenv DSSP /opt/dssp/bin/dssp

Since version 2.0.0, dssp is invoked with a syntax that differs from earlier versions. If
you have an older version of dssp, use the -ver option to direct do_dssp to use the older
syntax. By default, do_dssp uses the syntax introduced with version 2.0.0. Even newer
versions (which at the time of writing are not yet released) are assumed to have the same
syntax as 2.0.0.

The structure assignment for each residue and time is written to an .xpm matrix file. This
file can be visualized with for instance xv and can be converted to postscript with
xpm2ps. Individual chains are separated by light grey lines in the .xpm and postscript
files. The number of residues with each secondary structure type and the total secondary
structure (-sss) count as a function of time are also written to file (-sc).

Solvent accessible surface (SAS) per residue can be calculated, both in absolute values
(A^2) and in fractions of the maximal accessible surface of a residue. The maximal
accessible surface is defined as the accessible surface of a residue in a chain of
glycines. Note that the program [gmx-sas] can also compute SAS and that is more

Finally, this program can dump the secondary structure in a special file ssdump.dat for
usage in the program gmx chi. Together these two programs can be used to analyze dihedral
properties as a function of secondary structure type.


Options to specify input files:

-f [<.xtc/.trr/...>] (traj.xtc)
Trajectory: xtc trr cpt gro g96 pdb tng

-s [<.tpr/.gro/...>] (topol.tpr)
Structure+mass(db): tpr gro g96 pdb brk ent

-n [<.ndx>] (index.ndx) (Optional)
Index file

-map [<.map>] (ss.map) (Library)
File that maps matrix data to colors

Options to specify output files:

-ssdump [<.dat>] (ssdump.dat) (Optional)
Generic data file

-o [<.xpm>] (ss.xpm)
X PixMap compatible matrix file

-sc [<.xvg>] (scount.xvg)
xvgr/xmgr file

-a [<.xpm>] (area.xpm) (Optional)
X PixMap compatible matrix file

-ta [<.xvg>] (totarea.xvg) (Optional)
xvgr/xmgr file

-aa [<.xvg>] (averarea.xvg) (Optional)
xvgr/xmgr file

Other options:

-b <time> (0)
First frame (ps) to read from trajectory

-e <time> (0)
Last frame (ps) to read from trajectory

-dt <time> (0)
Only use frame when t MOD dt = first time (ps)

-tu <enum> (ps)
Unit for time values: fs, ps, ns, us, ms, s

-[no]w (no)
View output .xvg, .xpm, .eps and .pdb files

-xvg <enum>
xvg plot formatting: xmgrace, xmgr, none

-sss <string> (HEBT)
Secondary structures for structure count

-ver <int> (2)
DSSP major version. Syntax changed with version 2

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