[BiO BB] The 'X' amino acids in DSSP

[Iddo Friedberg]

On Tue, 16 Apr 2002, Qiang Lu wrote:

: Hi friends,
:
: In DSSP database, there are 'X' amino acids, other than A C D E ...
: (i.e. 20 amino acids). Do you know what does it mean?
:

An amino-acid which is not one of the 20. Usually a covalent modification
produced by protein engineering, but I've also seen phosphorylated
residues marked as `X'. Another option is may be the 21st amino-acid,
Selenocysteine. I suggest you check the particular `X' you are interested
in by looking at the original PDB file from which the DSSP file was
produced.

Yours,

Iddo

--

Iddo Friedberg                                  | Tel: +972-2-6757374
Dept. of Molecular Genetics and Biotechnology   | Fax: +972-2-6757308
The Hebrew University - Hadassah Medical School | email: idoerg at cc.huji.ac.il
POB 12272, Jerusalem 91120                      |
Israel                                          |
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