Building the biotin residue from pdb in Leap

Start xleap and load the residue:

     % xleap &
     > BTN = loadpdb biotin.pdb
     > edit BTN

	


Add bonds:

     > bondbydistance BTN

	


Select all atoms by dragging a box with left mouse button:


			


and pull down 'Edit selected atoms':

		


	


Add atom types and charges (the 'PERT' stuff is left alone
when building general templates):

	


Pull down 'Operations / Check table' to make sure all is ok,
and 'Save and quit' the table. 

In the Unit Editor, deselect the atoms by holding down the 
Shift key and clicking in the background (i.e. not on any atom). 
This is mainly cosmetic, so that the saved state will not 
have selection on.

Finally, save the residue in leap format at the command line:

    > saveoff BTN btn.lib

The residue can be loaded in later sessions by

    > loadoff btn.lib