UniProt release 2.2

Published July 30, 2004

UniProtKB News

Changes concerning the controlled vocabulary for PTMs

We are continuously overhauling the annotation of post-translational modifications (PTMs). For the feature key MOD_RES, the new introduced controlled vocabularies for PTMs (PTMlist.txt) are:

Methylation: All entries with annotated methylation sites have the keyword Methylation.
```
 N6,N6,N6-trimethyl-5-hydroxylysine
 N6-poly(methylaminopropyl)lysine
```
Hydroxylation: All entries with annotated hydroxylation sites have the keyword Hydroxylation.
```
 3-hydroxyproline
 4-hydroxyarginine
```
Unidentified N-terminal blocking modifications:
```
 Blocked amino end (Leu)
```

Other new controlled vocabularies for PTMs that are annotated with the feature key MOD_RES:

 Glycine radical (Keyword: Organic radical) 
 Pentaglycyl murein peptidoglycan amidated alanine (Keyword: Peptidoglycan-anchor)
 Tryptophylquinone