[Bioperl-l] post translational modifications

[Koen van der Drift]

Hi,

Is it possible to add post translational modifications to an amino acid 
sequence? For instance, in the following example, I would like to put a 
phosphate-group on the 2nd serine:

my $seq = Bio::Seq->new('-seq' => 'QWERTHGSSTYNMKGEDDLKR', '-alphabet' 
=> 'protein' );


thanks,


- Koen.