Re: [modeller_usage] symmetry restrain

[Modeller Caretaker <modeller-care@ucsf.edu>]

On 2/4/11 1:56 PM, flavio seixas wrote:
> I'm trying to built a protein with 4 identical chains using the
> symmetry restrain to CA atoms as section "2.2.11 Building multi-chain
> models with symmetry"  from modeller 9v7 manual.
...
> The problem is that the program stops and the following error message
> appears at the shell:
> self.restraints.symmetry.append(symmetry(s1, s2, s3, s4, 1.0))
> TypeError: __init__() takes exactly 4 arguments (6 given)

Just like the error message says, you cannot create a symmetry element 
that contains 4 selections. As in the example, it can only contain 2 
selections; it is a pairwise restraint. So you would need to restrain 
each pair (s1-s2, s2-s3 and s3-s4) individually.

For an example, see
http://salilab.org/archives/modeller_usage/2009/msg00084.html

	Ben Webb, Modeller Caretaker
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