Identification and characterization of the α-CA in the outer membrane vesicles produced by Helicobacter pylori

• Main Authors: Maurizio Ronci, Sonia Del Prete, Valentina Puca, Simone Carradori, Vincenzo Carginale, Raffaella Muraro, Gabriella Mincione, Antonio Aceto, Francesca Sisto, Claudiu T. Supuran, Rossella Grande, Clemente Capasso
• Format: Article
• Language: English
• Published: Taylor & Francis Group 2019-01-01
• Series: Journal of Enzyme Inhibition and Medicinal Chemistry
• Subjects: carbonic anydrases; helicobacter pylori; outer membrane vesicles (omvs); biofilm; protonography; mass spectrometry
• Online Access: http://dx.doi.org/10.1080/14756366.2018.1539716

The genome of Helicobacter pylori encodes for carbonic anhydrases (CAs, EC 4.2.1.1) belonging to the α- and β-CA classes, which together with urease, have a pivotal role in the acid acclimation of the microorganism within the human stomach. Recently, in the exoproteome of H. pylori, a CA with no indication of the corresponding class was identified. Here, using the protonography and the mass spectrometry, a CA belonging to the α-class was detected in the outer membrane vesicles (OMVs) generated by planktonic and biofilm phenotypes of four H. pylori strains. The amount of this metalloenzyme was higher in the planktonic OMVs (pOMVs) than in the biofilm OMVs (bOMVs). Furthermore, the content of α-CA increases over time in the pOMVs. The identification of the α-CA in pOMVs and bOMVs might shed new light on the role of this enzyme in the colonization, survival, persistence, and pathogenesis of H. pylori.