Bob Hanson wrote:
> Great work, Rolf. Here are three important questions:
> 
> 1) Currently Jmol identifies a protein residue as a group that contains 
> N, CA, and C and either O or O1.
> 
> Q: Is this still viable with the remediated set?

I am still working on this...

> 
> It would be good to have specific examples of the following changes, and 
> to know how many structures show these changes:
> 
> C    C1
> C    C2
> C    CA
> C    CB
> 
> CA    C1
> CA    C2
> CA    CH3
> 
> N    N6
> N    OXT
> 
> O    C
> O    CA
> O    CB
> O    H1
> O    N
> O    O8
> O    OXT
> O1    OD
> 
> 3HH3    C
> O    C
> UNK    C
> C    CA
> O    CA
> UNK    CA
> 
> N1    N
> NT    N
> O    N
> UNK    N
> 
> 
> OT1    O
> OXT    O
> UNK    O
> 
> 

A list is (temporarily) available at
"http://www.fli-leibniz.de/ImgLibPDB/tmp/atom_name_change_examples-2007_10_19.txt";.

> 
> 2) Currently Jmol identifies a nucleic acid residue as a group 
> containing O5' or O5*.
> 
> Q: Is this valid with the remediated set?
> 

I scanned all remediated PDB files for atom names containing "O5'" or
"O5*" and added full names for the residue names from the "chemical
Components Dictionary" (if available) to the resulting list
(temporarily) available at
"http://www.fli-leibniz.de/ImgLibPDB/tmp/pdb-O5_check-2007_10_19-unique_residues-with_names.txt";.

> It would be good to know what files show the following changes:
> 
> O5*    OP3
> 
They are included in the first list mentioned above.

> 
> 3) In addition, Jmol attempts to determine backbone atoms from a list of 
> known backbone atoms. These atoms currently include:
> 
> 1H,1H2',1H5',1HA,2H,2H2',2H5',2HA,2HO',3H,
> C,C1',C2',C3',C4',C5',CA,H,H1',H3',H3T,H4',H5T,HA,
> N,O,O1,O1P,O2',O2P,O3',O4',O5',O5T,OP1,OP2,OXT,P
> 
> (where ' may be *)
> 
> Q: Is this valid? (Was it ever?)
> 
I am not a chemist and don't feel competent enough to judge this.

Regards,
Rolf

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