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Christopher Fields > BioPerl-Run > Bio::Tools::Run::Alignment::Kalign



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Bio::Tools::Run::Alignment::Kalign - Object for the calculation of an iterative multiple sequence alignment from a set of unaligned sequences or alignments using the KALIGN program


  # Build a kalign alignment factory
  $factory = Bio::Tools::Run::Alignment::Kalign->new(@params);

  # Pass the factory a list of sequences to be aligned.
  $inputfilename = 't/cysprot.fa';
  # $aln is a SimpleAlign object.
  $aln = $factory->align($inputfilename);

  # or where @seq_array is an array of Bio::Seq objects
  $seq_array_ref = \@seq_array;
  $aln = $factory->align($seq_array_ref);

  # Or one can pass the factory a pair of (sub)alignments
  #to be aligned against each other, e.g.:

  #There are various additional options and input formats available.
  #See the DESCRIPTION section that follows for additional details.


Please cite:

        Timo Lassmann and Erik L.L. Sonnhammer (2005)
        Kalign - an accurate and fast multiple sequence alignment algorithm.
        BMC Bioinformatics 6:298

Helping the module find your executable

You will need to enable Kalign to find the kalign program. This can be done in (at least) three ways:

  1. Make sure the kalign executable is in your path (i.e. 
     'which kalign' returns a valid program
  2. define an environmental variable KALIGNDIR which points to a 
     directory containing the 'kalign' app:
   In bash 
        export KALIGNDIR=/home/progs/kalign   or
   In csh/tcsh
        setenv KALIGNDIR /home/progs/kalign

  3. include a definition of an environmental variable KALIGNDIR 
      in every script that will
     BEGIN {$ENV{KALIGNDIR} = '/home/progs/kalign'; }
     use Bio::Tools::Run::Alignment::Kalign;


Mailing Lists

User feedback is an integral part of the evolution of this and other Bioperl modules. Send your comments and suggestions preferably to one of the Bioperl mailing lists. Your participation is much appreciated.                  - General discussion  - About the mailing lists


Please direct usage questions or support issues to the mailing list:

rather than to the module maintainer directly. Many experienced and reponsive experts will be able look at the problem and quickly address it. Please include a thorough description of the problem with code and data examples if at all possible.

Reporting Bugs

Report bugs to the Bioperl bug tracking system to help us keep track the bugs and their resolution. Bug reports can be submitted via the web:

AUTHOR - Albert Vilella ^



The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _


 Title   : program_name
 Usage   : $factory->program_name()
 Function: holds the program name
 Returns:  string
 Args    : None


 Title   : program_dir
 Usage   : $factory->program_dir(@params)
 Function: returns the program directory, obtained from ENV variable.
 Returns:  string
 Args    :


 Title   : new
 Usage   : my $kalign = Bio::Tools::Run::Alignment::Kalign->new();
 Function: Constructor
 Returns : Bio::Tools::Run::Alignment::Kalign
 Args    : -outfile_name => $outname


 Title   : error_string
 Usage   : $obj->error_string($newval)
 Function: Where the output from the last analysus run is stored.
 Returns : value of error_string
 Args    : newvalue (optional)


 Title   : version
 Usage   : exit if $prog->version() < 2
 Function: Determine the version number of the program
 Example :
 Returns : float or undef
 Args    : none


 Title   : run
 Usage   : my $output = $application->run(\@seqs);
 Function: Generic run of an application
 Returns : Bio::SimpleAlign object
 Args    : Arrayref of Bio::PrimarySeqI objects or
           a filename to run on


 Title   : align
 Usage   :
        $inputfilename = 't/data/cysprot.fa';
        $aln = $factory->align($inputfilename);
        $seq_array_ref = \@seq_array; 
        # @seq_array is array of Seq objs
        $aln = $factory->align($seq_array_ref);
 Function: Perform a multiple sequence alignment
 Returns : Reference to a SimpleAlign object containing the
           sequence alignment.
 Args    : Name of a file containing a set of unaligned fasta sequences
           or else an array of references to Bio::Seq objects.

 Throws an exception if argument is not either a string (eg a
 filename) or a reference to an array of Bio::Seq objects.  If
 argument is string, throws exception if file corresponding to string
 name can not be found. If argument is Bio::Seq array, throws
 exception if less than two sequence objects are in array.


 Title   :  _run
 Usage   :  Internal function, not to be called directly        
 Function:  makes actual system call to kalign program
 Example :
 Returns : nothing; kalign output is written to a
           temporary file OR specified output file
 Args    : Name of a file containing a set of unaligned fasta sequences
           and hash of parameters to be passed to kalign


 Title   :  _setinput
 Usage   :  Internal function, not to be called directly        
 Function:  Create input file for kalign program
 Example :
 Returns : name of file containing kalign data input AND
 Args    : Arrayref of Seqs or input file name


 Title   :  _setparams
 Usage   :  Internal function, not to be called directly        
 Function:  Create parameter inputs for kalign program
 Example :
 Returns : parameter string to be passed to kalign
           during align or profile_align
 Args    : name of calling object


 Title   : aformat
 Usage   : my $alignmentformat = $self->aformat();
 Function: Get/Set alignment format
 Returns : string
 Args    : string

Bio::Tools::Run::BaseWrapper methods ^


 Title   : no_param_checks
 Usage   : $obj->no_param_checks($newval)
 Function: Boolean flag as to whether or not we should
           trust the sanity checks for parameter values  
 Returns : value of no_param_checks
 Args    : newvalue (optional)


 Title   : save_tempfiles
 Usage   : $obj->save_tempfiles($newval)
 Returns : value of save_tempfiles
 Args    : newvalue (optional)


 Title   : outfile_name
 Usage   : my $outfile = $kalign->outfile_name();
 Function: Get/Set the name of the output file for this run
           (if you wanted to do something special)
 Returns : string
 Args    : [optional] string to set value to


 Title   : tempdir
 Usage   : my $tmpdir = $self->tempdir();
 Function: Retrieve a temporary directory name (which is created)
 Returns : string which is the name of the temporary directory
 Args    : none


 Title   : cleanup
 Usage   : $kalign->cleanup();
 Function: Will cleanup the tempdir directory
 Returns : none
 Args    : none


 Title   : io
 Usage   : $obj->io($newval)
 Function:  Gets a L<Bio::Root::IO> object
 Returns : L<Bio::Root::IO>
 Args    : none
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