NetMHCpan on Biowulf

NetMHCpan predicts binding of peptides to any MHC molecule of known sequence using artificial neural networks. From the website description:

The method is trained on a combination of more than 850,000 quantitative Binding Affinity (BA) and Mass-Spectrometry Eluted Ligands (EL) peptides. The BA data covers 170 MHC molecules from human (HLA-A, B, C, E), mouse (H-2), cattle (BoLA), primates (Patr, Mamu, Gogo), swine (SLA) and equine (Eqca). The EL data covers 177 MHC molecules from human (HLA-A, B, C, E), mouse (H-2), cattle (BoLA), primates (Patr, Mamu, Gogo), swine (SLA), equine (Eqca) and dog (DLA). Furthermore, the user can obtain predictions to any custom MHC class I molecule by uploading a full length MHC protein sequence. Predictions can be made for peptides of any length.

References:

Documentation
Important Notes

Interactive job
Interactive jobs should be used for debugging, graphics, or applications that cannot be run as batch jobs.

Allocate an interactive session and run the program.
Sample session (user input in bold):

[user@biowulf]$ sinteractive
salloc.exe: Pending job allocation 46116226
salloc.exe: job 46116226 queued and waiting for resources
salloc.exe: job 46116226 has been allocated resources
salloc.exe: Granted job allocation 46116226
salloc.exe: Waiting for resource configuration
salloc.exe: Nodes cn3144 are ready for job

[user@cn3144 ~]$ module load netmhcpan

[user@cn3144 ~]$ cd /data/$USER

[user@cn3144 user]$ cp -r $NMTEST_DATA .

[user@cn3144 user]$ cd test

[user@cn3144 test]$ netMHCpan -p test.pep > test.pep.myout

[user@cn3144 test]$ netMHCpan -p test.pep -BA > test.pep_wBA.myout

[user@cn3144 test]$ netMHCpan test.fsa > test.fsa.myout

[user@cn3144 test]$ netMHCpan -hlaseq B0702.fsa -p test.pep > test.pep_userMHC.myout

[user@cn3144 test]$ exit
salloc.exe: Relinquishing job allocation 46116226
[user@biowulf ~]$

Batch job
Most jobs should be run as batch jobs.

Create a batch input file (e.g. netmhcpan.sh). For example:

#!/bin/bash
set -e
module load netmhcpan
cd /data/$USER/working
netMHCpan -p input.pep > input.pep.myout
netMHCpan -p input.pep -BA > input.pep_wBA.myout
netMHCpan -p input.fsa > input.fsa.myout
netMHCpan -hlaseq hla.fsa -p input.pep > output.pep_userMHC.myout

Submit this job using the Slurm sbatch command.

sbatch [--mem=#] netmhcpan.sh
Swarm of Jobs
A swarm of jobs is an easy way to submit a set of independent commands requiring identical resources.

Create a swarmfile (e.g. netmhcpan.swarm). For example:

netMHCpan -hlaseq hla.fsa -p input1.pep > output1.pep_userMHC.myout
netMHCpan -hlaseq hla.fsa -p input2.pep > output2.pep_userMHC.myout
netMHCpan -hlaseq hla.fsa -p input3.pep > output3.pep_userMHC.myout
netMHCpan -hlaseq hla.fsa -p input4.pep > output4.pep_userMHC.myout

Submit this job using the swarm command.

swarm -f netmhcpan.swarm [-g #] -t 2 --module netmhcpan
where
-g # Number of Gigabytes of memory required for each process (1 line in the swarm command file)
-t 2 2 threads/CPUs required for each process (1 line in the swarm command file).
--module netmhcpan Loads the netmhcpan module for each subjob in the swarm