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Submitting a Sequence for Analysis to Standalone PSORTb
Sequence File: One or more sequences in FASTA format can be submitted to standalone PSORTb,
provided they are all contained within one file (e.g. mysequences.txt) and are all from
the same Gram class of organism. If you have both Gram-negative and Gram-positive
sequences you wish to analyze, they must be divided into two files and run separately.
Command line syntax: Standalone PSORTb contains several options and arguments, which are
described below. The most basic command, however, which will be sufficient for most
instances, is:
$ psort [-p|-n|-a] mysequences.txt > mysequences.out
* psort calls the PSORTb program
* -p (Gram-positive) or -n (Gram-negative) or -a (Archaea) tells the program which
predictive model to use
* mysequences.txt is the name of your FASTA file containing the sequences to be analyzed
* > mysequences.out sends the output to a new file that will be created called
mysequences.out. If no > is used, the output will be written to the terminal display.
Usage: psort [-p|-n|-a] [OPTIONS] [SEQFILE]
Runs psort on the sequence file SEQFILE . If SEQFILE isn't provided then sequences will be read from STDIN.
--help, -h Displays usage information
--positive, -p Gram positive bacteria
--negative, -n Gram negative bacteria
--archaea, -a Archaea
--cutoff, -c Sets a cutoff value for reported results
--divergent, -d Sets a cutoff value for the multiple
localization flag
--matrix, -m Specifies the path to the pftools instalation. If
not set, defaults to the value of the PSORT_PFTOOLS
environment variable.
--format, -f Specifies sequence format (default is FASTA)
--output, -o Specifies the format for the output (default is
'normal' Value can be one of: terse, long or normal
--root, -r Specify PSORT_ROOT for running local copies. If
not set, defaults to the value of the PSORT_ROOT
environment variable.
--server, -s Specifies the PSort server to use
--verbose, Be verbose while running
--version, Print the version of PSORTb used
--x-skip-localization, Rewrite the comma separated list of localizations
to Unknown if predicted
--version, Print the version of PSortb
Help: Typing psort -h at the command prompt will bring up a list of available options and usage instructions.
Advanced Gram Stain Selection
There are some organisms whose Gram stains do not accurately reflect their cellular structure.
Two additional analysis options are provided for these organisms by the web version of
PSORTb v.3.0 -- "Positive with outer membrane" and "Negative without outer membrane".
By selecting "Advanced" in the Gram stain option, users can choose to analyze organisms that
stain Gram-positive but also have an outer membrane, such as Deinococcus spp, Mycobacterium spp,
and Veillonellaceae family of the Firmicutes phylum. The latter option allows users to
analyze organisms that stain Gram-negative but have no outer membrane, such as organisms
of the Tenericutes phylum, eg. Mycoplasma spp.
To perform such analysis in the command line version of PSORTB we recommend the following:
For "Positive with outer membrane" use the command line option: -n
For "Negative without outer membrane" use the command line option -p --x-skip-localization=Cellwall
This will give an output equivilent to the web version of PSORTb.
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