Advances in Helicobacter pylori lipopolysaccharide structure and function.

Helicobacter pylori is a widespread pathogen responsible for chronic gastritis, peptic ulcers, and an elevated risk of gastric cancer. Lipopolysaccharide (LPS), localized exclusively in the outer leaflet of the outer membrane, is essential for maintaining bacterial integrity. Recent advances have deepened our understanding of H. pylori LPS structure, particularly lipid A modifications and the redefinition of the core oligosaccharide and O-antigen regions. The complete set of enzymes involved in LPS biosynthesis has been identified in the reference strain G27, and comparative genomics has revealed a notable regional difference (the absence of the heptan domain in East Asian strains). Here, we summarize recent insights into the structure and function of H. pylori LPS, emphasizing its role in bacterial persistence and its promise as a target for LPS-based glycoconjugate vaccine development.