A VHH phagemid library was constructed from immune camel heavy chain antibodies. The nanobodies were displayed on M13 phage. Library selection was performed against UreC recombinant protein. A specific single-variable domain of heavy chain antibody against UreC was screened in five rounds of panning. The nanobody with the highest score in the phage ELISA was selected for soluble expression. The nanobody was purified with a nickel-nitrilotriacetic acid (Ni-NTA) column and confirmed with sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and Western blotting. Affinity, specificity, and urease inhibitory properties of the nanobody were assayed.
Here we showed the isolation and purification of a specific nanobody with high affinity against UreC recombinant protein that can inhibit urease activity.
The isolated UreC nanobody can specifically detect and bind to UreC and inhibit urease activity. This nanobody could be a novel class of treatment measure against H. pylori infection.