Why is "MODRES" written in some PDB files and not written some while both contains the modification "CCC"?

01 March 2021 1 235 Report

I have two PDBs:

PDB ID 4TS0 and PDB ID 3SUY. Both these are RNAs, and both contain the residue CCC. However, when I open the PDB file, I see the line "MODRES 3SUY CCC X 101 C" in case of 3SUY but there is no line containing "MODRES" in 4TS0. I do not understand the logic behind this. Could someone please explain?

Annemarie Honegger

Annotations in the header of the PDB file are not all that well standardised and have evolved over time. It may simply be a cultural difference between the two labs which produced the two structures (none of the authors for the associated publications overlap), or may depend on the specific programs used to finalise the structure.

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