Mauricio Carrillo Tripp wrote:
> Bob Hanson wrote:
>> The different sets of atoms
>> created by individual BIOMT transformations are selectable using the
>> "symop" selection option:
>>
>> select symop=3
>> select symop<6
>>
>> etc. (There is a bug there -- symop=1 specifically is not selectable in
>> 11.5.32)
> 
> 
> OK, so for example, if I want to display 1/2 capsid, I will have to load
> the PDB file 30 times, each time using a different select in the loading
> filter.
> By using the append option in the load command, all 30 biomolecules
> will 'live' on different frames, which can be independently selected by
> frame, OR the symop operator. correct?
> 

We must be careful not to mix up terms here. As far as I understood the
"biomolecule" is always a whole biologically active unit.

In the case of Mauricio's virus capsid there is only a single
biomolecule and it consists of the asymmetric unit plus 59 copies
generated by symmetry operations.

In the case of PDB entry '4otb' there are 6 different biomolecules which
 all look very similar. Each biomolecule consists of different sets of 2
chains (out of 12) from the asymmetric unit plus 2 copies of these
chains generated by symmetry operations. So in the end you will have 6
slightly different hexamers if you generate all biomolecules.

As far as Bob has described the filter options yet, I don't think that
it is currently possible to apply only a subset of the symmetry
operations of a specific biomolecule. So with the virus capsid you would
always get 60 copies of whatever you selected by the filter (e.g. only 1
chain out of 3) into a single model/frame. And if you wanted to display
only only one half of the capsid you could use for example the following
command:

  display symop<=30

How this half would really look like would of course depend on the order
of the symmetry operations (e.g.: a ball might look afterwards like a
ball with holes and not like one half of a ball).

Regards,
Rolf

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