[Chimera-users] Higher Order
goddard at cgl.ucsf.edu
Sun Jan 11 16:26:09 PST 2009
The SMTRY and MTRIX records in PDB files are only used to describe
crystal packing. SMTRY describes only crystallographic symmetries.
MTRIX describes only symmetries within the crystallographic asymmetric
unit when the deposited coordinates do not contain the full crystal
asymmetric unit (typically used for virus capsids). Other cases, e.g.
all electron microscopy structures use REMARK 350 biological unit BIOMT
matrices. See PDB 2tmv for an example of REMARK 350 for a helical
hsosa at aecom.yu.edu wrote:
> I have another related question: If I were to deposit a PDB
> coordinates file of a helical structure, what would be the best place
> to put helical symmetry information (the file includes the full
> coordinates for only one asymmetric unit) so that chimera can generate a
> model with more than one asymmetric unit ?. The idea being to be able
> to see the contacts between asymmetric units and the symmetry of the
> complex. Should I use the the SMTRY, or the MTRIX entries ?. Does
> it make any difference in chimera ?.
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