Abstract :
[en] Three soluble single-domain fragments derived from the unique variable
region of camelid heavy-chain antibodies (VHHs) against the CMY-2 b-lactamase behaved
as inhibitors. The structure of the complex VHH cAbCMY-2(254)/CMY-2 showed that the epitope
is close to the active site and that the CDR3 of the VHH protrudes into the catalytic
site. The b-lactamase inhibition pattern followed a mixed profile with a predominant
noncompetitive component. The three isolated VHHs recognized overlapping epitopes
since they behaved as competitive binders. Our study identified a binding site that can
be targeted by a new class of b-lactamase inhibitors designed on the sequence of the
paratope. Furthermore, the use of mono- or bivalent VHH and rabbit polyclonal anti-
CMY-2 antibodies enables the development of the first generation of enzyme-linked immunosorbent
assay (ELISA) for the detection of CMY-2 produced by CMY-2-expressing
bacteria, irrespective of resistotype.
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