Hi folks

I’ve noticed that for some structures, the PDB file seems to have the mmCIF 
entry for the “_atom_site.label_asym_id” as the chain ID, and for other PDB 
files it has the “_atom_site.label_entity_id”.

e.g. for 4bpq, for ATOM 1 I see - 

> CIF: ATOM 1    N N  . UNK A 1 1   ? 14.187  19.549  -8.010  1.00 0.00 ? 1   
> UNK A N  1
> 
> PDB: ATOM      1  N   UNK A   1      14.187  19.549  -8.010  1.00  0.00       
>     N  
> 
but for 6p9o for ATOM 1 I see - 

> CIF: ATOM 1 N N . ARG A 1 64 ? -0.538 27.658 131.675 1.00 39.97 ? 64 ARG 1 N 
> 1 64 UNP P03300 643 R
> 
> PDB: ATOM      1  N   ARG 1  64      -0.538  27.658 131.675  1.00 39.97       
>     N  

both have the corresponding loop items in the same order

loop_
_atom_site.group_PDB
_atom_site.id
_atom_site.type_symbol
_atom_site.label_atom_id
_atom_site.label_alt_id
_atom_site.label_comp_id
_atom_site.label_asym_id
_atom_site.label_entity_id
_atom_site.label_seq_id

so it shouldn’t be that the items are in a different order (which I think is 
allowed in STAR formats).

Any ideas which one is right? Or are they both right? Or both wrong? Or am I 
wrong about this, and have just mis-read the entries? (the refinement program 
for 6p9o is given as both REFMAC and “PHENIX” in the CIF - presumably 
phenix.refine, but I wouldn’t bet my house on it).

Harry

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