How do you display symmetry related molecules in PyMOL?
PyMOL can show crystal packing information by generating the “symmetry mate”. Once a crystal structure is loaded, go to “A”, select “generate”, then “symmetry mates”. There are options to display +/- one unit cell and within xx angstrom. Depending on the crystal size, the symmetry expansion can be very different.
How do you orient in PyMOL?
Holding the left mouse button while the pointer is inside the molecule will cause the camera to rotate along the X and Y axes. If however the pointer is outside the molecule, the camera will rotate along the Z axis. In the PyMOL Viewing Window molecules can be viewed and directly interacted with.
What is PyMOL Console?
PyMOL is a user-sponsored molecular visualization system on an open-source foundation, maintained and distributed by Schrödinger.
How do you show unit cell in PyMOL?
The unit cell may be shown by using the show command.
What is asymmetric unit?
The asymmetric unit is the smallest fraction of the unit cell that can be rotated and translated using only the symmetry operators allowed by the crystallographic symmetry to generate one unit cell.
How do I load a biological assembly in PyMOL?
Fetch retrieves a protein structure from the PDB and loads it into PyMOL. The PDB file is saved in fetch_path, which defaults to the current working directory for PyMOL. To download a so-called biological assembly or biological unit, use the assembly setting or use type=pdb1, type=pdb2 and so on.
How do you move molecules in PyMOL?
As Figure 3 shows, dragging with the left mouse button rotates the scene in the Display; dragging with the middle mouse button moves the molecule in the plane of the display; and dragging with the right mouse button zooms in and out.
How do you rename Sele in PyMOL?
Type: select all in the command line. Hit “enter”. Then, in the A (action) menu for the “sele” you just created, pick “rename selection”.
Why is PyMOL used?
PyMOL is a cross-platform molecular graphic tool and has been widely used for 3D visualization of macromolecules. The utilities of PyMOL have been extensively enhanced by various plugins, including macromolecular analysis, homology modeling, protein–ligand docking, pharmacophore modeling, VS, and MD simulations.
Is PyMOL free for students?
Educational subscriptions to PyMOL are available at no cost to full-time students and educators teaching full-time students.
How many molecules are in asymmetric unit?
18 molecules
The biological unit is a monomer and the 18 molecules in the asymmetric unit are randomly oriented (Fig. 4 ▶).
What is the asymmetric unit of a protein?
The asymmetric unit is the smallest portion of a crystal structure to which symmetry operations can be applied in order to generate the complete unit cell (the crystal repeating unit).
How many symmetry operators are there in PyMOL?
A space group like “P 21 21 21” which has 4 symmetry operators will count up to 03 XX: -1, 0, or 1, this is the unit cell offset from the center of the selection along the x-axis. PyMOL never creates more than 3 unit cells along each axis YY: analogous to XX, but along the y-axis
Which is the correct space group identifier for PyMOL?
Currently that information can only be provided to PyMOL as a CRYST1 record in the PDB file, which includes the correct space group identifier. However, it would be only a minor development task to add a means of assigning unit-cell and symmetry to any molecule object directly from the API. The format of the CRYST1 record is as follows.
How is the symexp command used in PyMOL?
The “symexp” command is used to display symmetry related molecules in the crystal lattice about an atom selection. This commands creates a set of new objects with a common prefix. Each object in the series corresponds to one symmetry-related object, which can be treated independently.
How many unit cells does PyMOL ever create?
PyMOL never creates more than 3 unit cells along each axis From within PyMOL, help symexp and symexp ?.