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Difference between revisions of "Symmetry"
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Structures determined by X-ray crystallography are typically deposited as files containing the coordinates for one asymmetric unit (ASU). Knowledge of the symmetry operators that describe how the ASUs are arranged relative to each other allows the arrangement of the crystal lattice to be recreated. PyMOL can read this symmetry information from the input coordinate file and recreate the neigbouring copies of the ASU using symmexp. | Structures determined by X-ray crystallography are typically deposited as files containing the coordinates for one asymmetric unit (ASU). Knowledge of the symmetry operators that describe how the ASUs are arranged relative to each other allows the arrangement of the crystal lattice to be recreated. PyMOL can read this symmetry information from the input coordinate file and recreate the neigbouring copies of the ASU using symmexp. | ||
| − | === [[ | + | === symexp === |
| − | + | PyMOL's built in symmetry expansion functionality is available as A->generate->symmetry mates for an object or as the [[Symexp]]command | |
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== Displaying symmetry axes == | == Displaying symmetry axes == | ||
Revision as of 16:10, 17 November 2020
There are many ways that symmetry can be important/useful/beautiful to look at in macromolecular structures. A typically application is the reconstruction of a symmetry oligomer from a few subunits. PyMOL has tools that can help with this type of analysis or depiction.
Expanding crystallographic symmetry
Structures determined by X-ray crystallography are typically deposited as files containing the coordinates for one asymmetric unit (ASU). Knowledge of the symmetry operators that describe how the ASUs are arranged relative to each other allows the arrangement of the crystal lattice to be recreated. PyMOL can read this symmetry information from the input coordinate file and recreate the neigbouring copies of the ASU using symmexp.
symexp
PyMOL's built in symmetry expansion functionality is available as A->generate->symmetry mates for an object or as the Symexpcommand