Helicobacter pylori urease complex (HPU) (HPU)

The Helicobacter pylori urease complex is a large, nickel-dependent metalloenzyme that plays a critical role in the pathogenesis of H. pylori by enabling the bacterium to survive the acidic environment of the stomach (UniProt, P14916). The enzyme complex is typically composed of two subunits, UreA and UreB, arranged in a dodecameric (alpha6-beta6) structure (PubMed, PMC493354). Its primary biological function is the hydrolysis of urea into ammonia and carbon dioxide, which neutralizes gastric acid and creates a habitable microenvironment for the pathogen (StatPearls, 2023). This neutralization is essential for gastric colonization and contributes to the development of gastritis, peptic ulcers, and gastric adenocarcinoma (NIH, NBK544250). In clinical practice, the urease complex is the basis for the Urea Breath Test (UBT), a non-invasive gold standard for detecting active infection (PubMed, 28944195). While several inhibitors like acetohydroxamic acid have been developed to target this enzyme, their clinical use is often restricted due to toxicity, making the complex a significant focus for novel antimicrobial drug design (PubMed, 11544352).

Other names

UreaseUrea amidohydrolaseNickel-dependent ureaseH. pylori urease

Inhibition of the urease enzyme prevents the hydrolysis of urea into ammonia, thereby failing to neutralize gastric acid and hindering the survival and colonization of Helicobacter pylori in the stomach (StatPearls, 2023). Competitive inhibitors like acetohydroxamic acid bind to the nickel ions in the active site, blocking substrate access (PubMed, PMC139104).