neutron refinement of protonated Glu and residues with alternate conformation
Hi, I am doing joint X-ray and neutron refinement for my structure. I found a few residues with two alternate conformations. After I generated alternation conformations, I used phenix.readyset to generate hydrogen and deuterium atoms for D/H atoms. However, phenix.readyset only gives H atoms for exchangable H atoms, such as the amide H atoms. The reason is that A and B letters have been assigned for the alternate conformation, not for the D/H atoms for particular conformations. Could anyone know how to solve this problem? The second question is that I found one Glu residue is protonated at OE1 atom of its carboxylate side chain. How could I generate protonated Glu? Do I need a strain file for this? Thanks! Qun
On Tue, May 5, 2015 at 2:20 AM, crystallogrphy
I found a few residues with two alternate conformations. After I generated alternation conformations, I used phenix.readyset to generate hydrogen and deuterium atoms for D/H atoms. However, phenix.readyset only gives H atoms for exchangable H atoms, such as the amide H atoms. The reason is that A and B letters have been assigned for the alternate conformation, not for the D/H atoms for particular conformations. Could anyone know how to solve this problem?
ReadySet! is not able to add D/H onto alternative locations. That needs to be done with care to ensure that the correct atoms are "seeing" the correct atoms in the surrounding environment.
The second question is that I found one Glu residue is protonated at OE1 atom of its carboxylate side chain. How could I generate protonated Glu? Do I need a strain file for this?
The restraints should happen automatically in refinement if you have the correctly named atoms in the correct location. You can check this in the .geo file. I'm happy to assist if you send me the model, off-line. Cheers Nigel --- Nigel W. Moriarty Building 64R0246B, Physical Biosciences Division Lawrence Berkeley National Laboratory Berkeley, CA 94720-8235 Phone : 510-486-5709 Email : [email protected] Fax : 510-486-5909 Web : CCI.LBL.gov
Hi Qun,
I found a few residues with two alternate conformations. After I generated alternation conformations, I used phenix.readyset to generate hydrogen and deuterium atoms for D/H atoms. However, phenix.readyset only gives H atoms for exchangable H atoms, such as the amide H atoms. The reason is that A and B letters have been assigned for the alternate conformation, not for the D/H atoms for particular conformations. Could anyone know how to solve this problem?
this is imitation of phenix.refine due to the fact that PDB file format does not allow longer than one-letter altloc id. Pavel
participants (3)
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crystallogrphy -
Nigel Moriarty -
Pavel Afonine