[Key-worded input file]
MrBUMP has three main parts:
Note that MrBUMP makes a number of calls to web-based applications. If your sequence information is in any way sensitive, it is recommended that you use the option to run the fasta search locally rather than via the OCA web application. This will require installing fasta34 on the users local machine. The software can be downloaded from the EBI website here.
Before MrBUMP can be used, the following dependencies should be installed on the local system.
There are a number of options for specifying parameters (e.g. number of molecules expected in the asymmetric unit) or preferences (e.g. which multiple alignment program to use). Most of these have sensible defaults. The only mandatory keywords are LABIn and JOBId.
ROOTdir, NMASu, MDLNum, MRNUm, ENSEmnum, INCLude, LOCAlfile, FIXEd_xyzin, IGNOre, MRPRograms, MAPRogram, MDLDpdbclp, MDLPlyala, MDLMolrep, MDLChainsaw, SSMSearch, SCOPsearch, PQSSearch, DOFAsta, FASTalocal, PACK, NCYC, UPDAte, ONLYmodels, TRYAll, USEAcorn, ACORnres, ENANt
CLUSter, CLEAn, DEBUg, PROXyserver
Mandatory. This keyword tells the program which columns in the MTZ file should be used as native structure factors, sigmas, and FreeR flag. Available program labels are F, SIGF and FreeR_flag.
Mandatory. This is a name for the job. A directory called "search_JOBID" will be created in the directory in which mrbump is started from. This directory will contain all of the downloaded files and results.
The root directory where the search folder will be created.
[Default Current working directory]
The number of molecules in the asymmetric unit. Leave this blank for automatic calculation.
The number of template models to be prepared for molecular replacement.
The number of prepared models to be used molecular replacement.
The number of prepared models to be used in a Phaser Ensemble.
A list of PDB ID codes and Chain IDs to be included in the homologue search. Any specific chains
entered here are automatically processed in molecular replacement regardless of how they score in the
template model scoring.
Example: INCLUDE 1nio_A.
Use this keyword to specify the location of a local PDB file to be used as a search model in mrbump.
The full path to the file must be specified. The optional CHAIN subkeyword can be used to specify a particular
chain in the PDB file. If CHAIN is not used then the program will extract chain "A" from the file.
Example: LOCALFILE /tmp/1nio.pdb CHAIN A.
The FIXED_XYZIN keyword allows the user to input a fixed component structure in the MR search. This
component should already have the correct orientation. This keyword can be used multiple times if there
are more than one fixed components known. The sequence identity for each component against its corresponding
section of the target sequence is required. The full path to the PDB file should also be specified. Fixed
components are passed to both Phaser and Molrep.
Example: FIXED_XYZIN /tmp/fixed.pdb IDEN 0.43
A list of PDB ID codes to be ignored in the homologue search. Used for development purposes.
Names of Molecular Replacement programs to try search models in. Options are Molrep, Phaser or both.
If both are selected Molrep will be used first.
Name of the sequence alignment program to be used to do multiple alignment of the template structure
sequences and the target sequence. In good cases, these programs should give the same result. In
more marginal cases (e.g. small number of sequences, low sequence identity) they may give very
If true models will be prepared for MR using the PDBclip method. With this method, the waters and hydrogens
are removed from the coordinate file and the most probable side-chain confirmations are selected. If chain ID's
are missing they are added.
If true Polyalanine models will be prepared for the MR step. All side-chains are removed from the PDB files.
If true models will be prepared using Molrep. Molrep does a sequence alignment of the target sequence and
the template sequence and prunes the template structure file accordingly.
If true models will be prepared using Chainsaw. Chainsaw takes in a sequence alignment of the target sequence and
the template sequence and prunes the template structure file accordingly.
If true mrbump will use the top match from the sequence-based search in a secondary structure-based
search to find more potential homologues. Set to false by default. Requires perl and the perl SOAP-Lite
module to be installed.
If true mrbump will use the SCOP database to look for individual domains in the template structures
found in the sequence-based and secondary structure-based searches.
If true mrbump will use the PQS service at the EBI to find more multimers based on the template
structures found in the sequence-based and secondary structure-based searches.
If true, a FASTA search will be carried out to search for the possible template models. A user can turn this
off and give specific chain IDs to be used as the template models. Note that at least one chain must be specified
using the INCLUDE keyword if DOFASTA is set to False.
If true, the fasta sequence-based search will be carried out locally rather than via the OCA web-interface.
This requires that the user have fasta34 installed on there system. This can be downloaded from the EBI
The number of clashes that Phaser will tolerate.
The number of cycles of restrained refinement to use in Refmac.
If true, the search database files will be tested at the start of the job to see if they are out of date
with respect to those available from the EBI website. If they are found to be out of date, the latest version
will be downloaded.
If true, only the search models will be generated. The program will exit before any Molecular Replacement
is carried out.
If true, the program will try all of the search models in molecular replacement. If false the program will
exit when it finds the first solution.
If true, program will put each positioned and refined search model through the program Acorn to try and improve the phases. The target data must also be at least 1.7 A. Acorn is unlikely to help at lower resolutions, but this resolution limit can be changed with the ACORnres keyword.
MrBUMP prints out the correlation coefficient for medium E values from Acorn. An increase
in these correlation coefficients over Acorn cycles is a good sign that you have the correct
solution (the absolute value of the CC may be low, because these are not the strongest E values).
The columns ECOUT, PHIOUT and WTOUT from Acorn can be used to generate high quality maps to
help model re-building.
Resolution limit for applying the Acorn phase improvement procedure.
If true, program will do molecular replacement for all search models in the enantiomorphic spacegroup, as
well as in the HKLIN spacegroup, if an enantiomorph exists for the target data spacegroup. MrBUMP will
identify the better spacegroup for each model. For good MR solutions, the correct spacegroup should
be identified. For wrong or marginal solutions, it may be harder to distinguish the correct spacegroup.
If true, the model preparation and molecular replacement jobs will be farmed out to a cluster. Currently
only works for Sun Grid Engine enabled clusters.
If true, the program will remove the files generated for models that were marked as "Failed" solutions. Also,
any files in the scratch area will be removed. This is to cut down on disk space usage.
If true mrbump will give a more verbose output. Also, temporary directories will not be
deleted at the end of the job.
If you need to use a proxy server to access the internet you should set it using PROXYSERVER. MrBUMP
uses several on-line services and databases (e.g. the PDB) and thus requires internet access. It is possible to
run MrBUMP without internet acces by turning off the FASTA, SSM and PQS searches and using locally stored PDB files
as input search models. The proxy server is set in the environment in which MrBUMP is running. An example of
a proxy server would be "http://proxy.mysite.com:8080/".
[Default not set]
Simple example with minimal input using default values:
LABIN F=F SIGF=SIGF FreeR_flag=FreeR_flag JOBID MY_JOB_1
A more elaborate example:
LABIN F=FP SIGF=SIGFP FreeR_flag=FREE JOBID MY_JOB_2 MDLNUM 20 MRNUM 10 ENSEMNUM 5 IGNORE 1smw 1smm 1smu MRPROGRAM molrep MAPROGRAM mafft DEBUG true CLUSTER false SCOPSEARCH true SSMSEARCH true PQSSEARCH true END
Norman Stein, Pryank Patel.
Any publication arising from use of MrBUMP should include the following reference:
R.M.Keegan and M.D.Winn (2007) Acta Cryst. D63, 447-457In addition, authors of specific programs should be referenced where applicable: