Helicobacter pylori is the most common world-wide infection and plays an important role in pathogenesis of peptic ulcers. The CagA (cytotoxin-associated gene A) protein is a cell-surface antigen which may play a role in determining the relative virulence of the viral strains. This entry represents the phosphopeptide substrate mimic region of CagA [1].

1: Helicobacter pylori CagA inhibits PAR1-MARK family kinases by mimicking host substrates. Nesic D, Miller MC, Quinkert ZT, Stein M, Chait BT, Stebbins CE; Nat Struct Mol Biol. 2010;17:130-132. PMID:19966800