CagA is a major disease-associated factor injected by the gastric pathogen Helicobacter pylori. In this issue, Hayashi et al. (2012) report the crystallographic structure of the CagA N terminus (residues 24-876) at 3.19 Å resolution. This study revealed three distinct domains, giving novel insights into intramolecular and intermolecular protein and phosphatidylserine interactions.
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