The PDB formats are described here:

You should also be aware of MODRES (modified residue) in addition to SEQRES records.

On Feb 13, 2008 2:36 PM, Angel HerrŠez <> wrote:
I'm afraid not, Emily
You should have the three-letter sequence, divided up along several lines, marked
"SEQRES" at the beginning.

That's for proteins, of course. Nucleic acids do use a one-letter system.

> Hi, I am looking at the contents of a pdb file. Can someone tell me how/if the single-letter
> residue sequence is contained in that file?

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