Hi Anasuya,

> how do i put a protein molecule inside a cube with x-axis spanning till the
> largest x-coordinate, y-axis spanning till the largest y-coordinate, and 
> z-axis
> spanning till the largest z-coordinate?
>
> Once i do this, can i divide the larger cube(i.e. the one holding the entire
> protein) into smaller ones of lesser dimensions? Say, 5A x 5A x 5A?

I'm not aware of any straightforward solution for this. You could write 
a python script that creates selections for each (sub)cube, but I guess 
it will be a quite complex script. Have a look at 
http://pymolwiki.org/index.php/SelInside which should cover all 
necessary API functions.

> Once i generate these smaller cubes, is there a way via pymol, by which i can
> navigate through the protein molecule, (smaller)cube by (smaller)cube?
> As in, can pymol be used to tell me which residues are lying in which 
> (smaller)
> cube and so on?

If you have selections for each cube, try this to lookup cubes that 
contain atoms of residue number 10:

print cmd.get_names('public_selections', 0, 'resi 10')

> Can all this be done in a single pymol window/script?
> please let me know.
>
> Thanks
> -Anasuya

Cheers,
   Thomas

-- 
Thomas Holder
MPI for Developmental Biology

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