Simon
Things have improved since last December's version 1.7.3 but rather
than install a nightly build I believe you can solve your problems by
using the attached files. One program that can help a lot is CarboLoad
which will load a carbohydrate into your model without having to
fiddle with Coot. I would install a nightly build, however, if you
wish to get some great new features.
Cheers
Nigel
PS.
CarboLoad - A program for loading carbohydrates into a protein model
Usage:
phenix.carbo_load protein_pdb_file_name=pdb3a37.ent \
carbohydrate_file_name=man.txt \
map_coeffs_file_name=pdb3a36_map_coeffs.mtz \
residue_selection="resname LG1"
You can even specify the carbohydrate using the string "NAG-NAG-MAN".
Contact me for any help you require.
On Tue, Apr 17, 2012 at 3:18 AM, Simon Kolstoe
Hi phenixbb,
Every couple of years I come to build a sugar chain into a protein structure and hope the process is less painful than last time, however it seems things still are not smooth yet!
I'm trying to build a fairly standard sugar chain onto a protein and am encountering many problems. What I am doing is using coot to get the coordinates for each sugar using the "File-> Get monomer" option and then putting the appropriate link in my phenix.refine .def file after renumbering the sugars. For example:
apply_cif_link { data_link = "BETA1-2" residue_selection_1 = chain Z and resname NAG and resid 5 residue_selection_2 = chain Z and resname MAN and resid 4 } apply_cif_link { data_link = "BETA1-4" residue_selection_1 = chain Z and resname GAL and resid 6 residue_selection_2 = chain Z and resname NAG and resid 5 }
For some reason I keep getting the following error:
---------------
Chain: "Z" Number of atoms: 220 Number of conformers: 1 Conformer: "" Sorry: Traceback (most recent call last): File "/Applications/PHENIX-1.7.3-928/Contents/phenix-1.7.3-928/cctbx_project/mmtbx/monomer_library/pdb_interpretation.py", line 1042, in apply_mod mod_mon = self.monomer.apply_mod(mod_mod_id) File "/Applications/PHENIX-1.7.3-928/Contents/phenix-1.7.3-928/cctbx_project/mmtbx/monomer_library/cif_types.py", line 399, in apply_mod result.delete_atom_in_place(mod_atom.atom_id) File "/Applications/PHENIX-1.7.3-928/Contents/phenix-1.7.3-928/cctbx_project/mmtbx/monomer_library/cif_types.py", line 316, in delete_atom_in_place raise RuntimeError("delete_atom_in_place: unknown atom_id: %s" % atom_id) RuntimeError: delete_atom_in_place: unknown atom_id: HO2 apply_mod failure: pdbres="NAG Z 5 " segid="Z " comp id: NAG-b-D mod id: DEL-HO2
------------------
I haven't deleted the hydrogens that came with the sugars so what I thought it was doing was trying to delete an atom that isn't there, however adding a dummy atom with the name HO2 didn't work - any ideas?
Also it seems happy with BETA1-4 links but not ALPHA2-6 links? How do I specify this link?
Thanks,
Simon
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