Bugs item #3324420, was opened at 2011-06-22 10:49
Message generated for change (Tracker Item Submitted) made by gcincilla
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Category: File Translation
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: green69 (gcincilla)
Assigned to: Nobody/Anonymous (nobody)
Summary: openbabel move the position of already present hydrogens

Initial Comment:
Hi! I'm using openbabel v. 2.3.0 with a GNU/Linux OS (Ubuntu 10.10). I have the 
following problem on adding hydrogens with babel:
I have a structure contaning only certain hydrogen atoms (in my case the "polar 
hydrogens" e.g. those bounded to etheroatoms) and I want to add (with the 
command "obabel -ipdb filename.pdb -p 7.5 -o -O filename_H.pdb") all the 
hydrogens present in the structure at pH = 7.5.  It seems that babel first 
eliminate those hydrogens already present in the structure and then re-add all 
hydrogens atoms. This results in the change of the position of those hydrogens 
(in my case the polar ones) that were already present in the structure. I think 
this can lead to serious problem.
I'll attach the 2 files and a figure where one can appreciate the difference in 
the hydroxy hydrogen position.

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