The common human pathogen Helicobacter pylori is the major cause of gastric
and duodenal ulcers. Based on the complete genome sequences of two indepen
dent isolates more than 1800 protein species have been resolved by two-dime
nsional gel electrophoresis and more than 200 of them have been identified
(http://www.mpiibberlin.mpg.de/2D-PAGE). Using these data, a large range of
research areas including strain fingerprinting, protein composition and su
bcellular localization, gene regulation, and pathogen-host interactions hav
e been investigated. The results that have been obtained led to a more deta
iled understanding of the Helicobacter biology and pathology and open furth
er interesting fields for future work.