id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	blockedby	blocking	notify_on_close	platform	project
1180	mmCIF reader forms no chains	lpravda@…	Greg Couch	"At PDBe (EMBL-EBI) we are working on improving presentation of small molecules and their binding. I am looking into ChimeraX to add hydrogens into protein structures, however, I found out that the protonated structure written in mmCIF is modified in comparison to the input structure.
 
I attach both the input (1tqn-assembly-1.cif) and the output files (1tqn_h.cif). It appears that ChimeraX modifies the following mmCIF fields:
 
_atom_site.group_PDB -> all the atoms become HETATM in the output file
_atom_site.label_asym_id -> has been changed from A - protein, B - HEM, 
C - HOH to T - protein, U - HEM, HOH - water
 
I’m not sure if that is an intended behaviour or a bug? I used ChimeraX version 0.7 (2018-06-30)"	defect	closed	blocker	0.7	Input/Output		fixed		chimera-programmers				all	ChimeraX