Re: [ccp4bb] Symmetry operator

2013-01-11 Thread Eleanor Dodson
I am afraid now I just use PISA at the EBI to answer this sort of question . It tells you the answer with lots of other useful information as well, and then you can use your intelligence to see why that operator is the correct one! Eleanor On 11 Jan 2013, at 01:05, James Stroud wrote: > The tr

Re: [ccp4bb] Symmetry operator

2013-01-10 Thread James Stroud
I need to amend that and make a couple of corrections, after thinking about it. First, the rotation-translations shouldn't be sensitive to the origin. Second, if it has C4 ("square") symmetry, then you only need one generator (rotation-translation) to make the tetramer, and the two monomers shou

Re: [ccp4bb] Symmetry operator

2013-01-10 Thread Bosch, Juergen
coot: show symmetry molecules, then save symmetry molecule and you have your tetramer most likely Jürgen On Jan 10, 2013, at 7:48 PM, james09 pruza wrote: Hi, Which program outputs the symmetry operator (rotation and translation)? I have a dimer in the asymmetric unit and need to know the sym

Re: [ccp4bb] Symmetry operator

2013-01-10 Thread James Stroud
The transformation matrix describing the symmetry is sensitive to the coordinate system origin. You should center the entire tetramer on the origin (0, 0, 0), where the origin coincides with the point symmetry element. If you have a tetramer with true point symmetry, then the center of the tetr

[ccp4bb] Symmetry operator

2013-01-10 Thread james09 pruza
Hi, Which program outputs the symmetry operator (rotation and translation)? I have a dimer in the asymmetric unit and need to know the symmetry operator to get a tetramer, the active molecule. James