Table of Contents
HmmerIndex creates an index for a profile hidden Markov model database so that profile HMMs can be retrieved from the database with HmmerFetch.
HmmerIndex provides a Accelrys GCG (GCG) interface to the hmmindex program of Dr. Sean Eddy's HMMER package. It allows you to access most of hmmindex's parameters from GCG command line.
In order to retrieve profile HMMs from a database of profile HMMs, the database must first be indexed with HmmerIndex. The index is a binary file referred to as a GSI ("generic sequence index"). The Pfam and PfamFrag databases distributed with GCG are already indexed, but if you create your own profile HMM database, you must index it yourself. Once the index is created, you can use HmmerFetch to retrieve individual profile HMMs from the database, much as you can use Fetch to retrieve sequences from sequence databases.
Here is a session using HmmerIndex to index a small profile HMM database called HSP.hmmdb. This database was created by using HmmerFetch to retrieve four profile HMMs (HSP20.hmm, HSP33.hmm, HSP70.hmm, HSP90.hmm) from the Pfam database, then using HmmerConvert with the -MENu=E parameter to concatenate the individual profile HMMs into a single file.
HMMERINDEX which HMM database ? HSP.hmmdb
Creating temp file for input to hmmindex .
Calling hmmindex to perform analysis ...
hmmindex -- create GSI index for an HMM database
HMMER 2.1.1 (Dec 1998)
Copyright (C) 1992-1998
HMMER is freely distributed under the GNU General Public License (GPL).
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HMM file: /usr/users/share/smith/HSP.hmmdb
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Determining offsets for /usr/users/share/smith/HSP.hmmdb, please be patient...
GSI /usr/users/share/smith/HSP.hmmdb.gsi indexes 8 keys (names+accessions)
for 4 H MMs in /usr/users/share/smith/HSP.hmmdb.
The output is a binary file called HSP.hmmdb.gsi.
HmmerIndex's only input is a profile HMM database file. You can create your own profile HMM database by concatenating profile HMM files. This can be done in several ways. Within the HMMER package, you can append a new profile HMM to an existing one by using the -APPend parameter with HmmerBuild or the append menu option (-MENu=E) in HmmerConvert.
You can also use UNIX commands to append a profile HMM to an existing one or to concatenate several profiles into a single new file:
% cat newprofile.hmm_g >> existing.hmm_g
% cat profile1.hmm_g profile2.hmm_g > two_profiles.hmmdb
ProfileMake makes a profile from a multiple sequence alignment. ProfileSearch uses the profile to search a database for sequences with similarity to the group of aligned sequences. ProfileSegments displays optimal alignments between each sequence in the ProfileSearch output list and the group of aligned sequences (represented by the profile consensus). ProfileGap makes optimal alignments between one or more sequences and a group of aligned sequences represented as a profile. ProfileScan finds structural and sequence motifs in protein sequences, using predetermined parameters to determine significance.
HmmerBuild makes a profile hidden Markov model from a multiple sequence alignment. HmmerAlign aligns one or more sequences to a profile HMM. HmmerPfam searches a database of profile HMMs with a sequence query in order to identify known domains within the sequence. HmmerSearch uses a profile HMM as a query to search a sequence database for sequences similar to the original aligned sequences. HmmerCalibrate calibrates a hidden Markov model so that database searches using it as a query will be more sensitive. HmmerIndex creates a binary GSI ("generic sequence index") for a database of profile HMMs. HmmerFetch retrieves a profile hidden Markov model by name from an indexed database of profile HMMs. HmmerEmit randomly generates sequences that match a profile HMM. HmmerConvert converts between different profile HMM file formats and from profile HMM to GCG profile file format.
The profile HMM database to be indexed must consist of a single file. All of the profile HMMs in the file must be of the same type (ASCII text or binary).
If you add a new profile HMM to a database, you must re-index that profile HMM database.
All parameters for this program may be added to the command line. Use -CHEck to view the summary below and to specify parameters before the program executes. In the summary below, the capitalized letters in the parameter names are the letters that you must type in order to use the parameter. Square brackets ([ and ]) enclose parameter values that are optional.
Minimal Syntax: % hmmerindex [-INfile1=]HSP.hmm -Default
Local Data Files: None
-NOMONitor suppresses the screen monitor
You can set the parameters listed below from the command line.
Suppresses the display of the program's progress on the screen.
Printed: May 27, 2005 12:45
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