Article (Scientific journals)
Allosteric inhibition of VIM metallo-beta-lactamase by a camelid nanobody
Sohier, Jean; Laurent, Clémentine; Chevigné, Andy et al.
2013In Biochemical Journal, 450 (3), p. 477-486
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Keywords :
Nanobody; metallo-beta-lactamase; inhibition
Abstract :
[en] Metallo-β-lactamase (MβL) enzymes are usually produced by multiresistant Gram-negative bacterial strains and have spread worldwide. An approach based on phage display was employed to select single-domain antibody fragments (VHHs also called Nanobodies) that would inhibit the clinically relevant VIM-4 MβL. Out of more than 50 selected nanobodies, only the NbVIM_38 nanobody inhibited VIM-4. The paratope, inhibition mechanism and epitope of NbVIM_38 nanobody were then characterised. An alanine scan of the NbVIM_38 paratope showed that its binding was driven by hydrophobic amino acids. The inhibitory concentration was in the µM range for all tested β-lactams. In addition, the inhibition was found to follow a mixed hyperbolic profile with a predominantly uncompetitive component. Moreover, substrate inhibition was recorded only after nanobody binding. These kinetic data are indicative of a binding site that is distant from the active site. This finding was confirmed by epitope mapping analysis that was performed using peptides, and which identified two stretches of amino acids in the L6 loop and at the end of the alpha2 helix. Because this binding site is distant from the active site and alters both the substrate binding and catalytic properties of VIM-4, this nanobody can be considered as an allosteric inhibitor.
Research center :
CIP - Centre d'Ingénierie des Protéines - ULiège
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Sohier, Jean ;  Université de Liège - ULiège > Département des sciences de la vie > Macromolécules biologiques
Laurent, Clémentine ;  Université de Liège - ULiège > Département des sciences de la vie > Macromolécules biologiques
Chevigné, Andy;  CRP-Santé (Luxembourg)
Pardon, Els;  Vrije Universiteit Brussel - VUB
Srinivasan, Vasundara;  Vrije Universiteit Brussel - VUB
Wernery, Ulrich;  Central Veterinary Research (Dubai)
Lassaux, Patricia ;  Université de Liège - ULiège > GIGA-R : Virologie - Immunologie
Steyaert, Jan;  Vrije Universiteit Brussel - VUB
Galleni, Moreno ;  Université de Liège - ULiège > Département des sciences de la vie > Macromolécules biologiques
Language :
English
Title :
Allosteric inhibition of VIM metallo-beta-lactamase by a camelid nanobody
Alternative titles :
[fr] Inhibition allostérique d'une métallo-beta-lactamase de la famille des VIMs par un nanobody de camélidés.
Publication date :
15 March 2013
Journal title :
Biochemical Journal
ISSN :
0264-6021
eISSN :
1470-8728
Publisher :
Portland Press, London, United Kingdom
Volume :
450
Issue :
3
Pages :
477-486
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
Sélection et caractérisation de Nanobodies inhibiteurs de β-lactamases.
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture [BE]
Available on ORBi :
since 30 May 2013

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