Comparison of three anti-hapten VHH selection strategies for the development of highly sensitive immunoassays for microcystins

Dublin Core

Title

Comparison of three anti-hapten VHH selection strategies for the development of highly sensitive immunoassays for microcystins

Subject

CIANOBACTERIAS
MICROCISTINAS
INMUNOENSAYOS
BIBLIOGRAFIA NACIONAL QUIMICA
2017

Abstract

Owing to their reproducibility, stability, and cost-effective production, the recombinant variable domains of heavy-chain-only antibodies (VHHs) are becoming a salient option as immunoassay reagents. Recently, there have been several reports describing their application to the detection of small molecules (haptens). However, lacking the heavy-light chain interface of conventional antibodies, VHHs are not particularly apt to bind small analytes and failures are not uncommon. Here we describe the construction of a VHH phage display library against the cyanobacterial hepatotoxin microcystin LR and its selection using competitive panning and two novel panning strategies. The outcome of each strategy was evaluated by a large-scale screening using in vivo biotinylated nanobodies. The three methods selected for different nonoverlapping subsets of VHHs, allowing one to optimize the immunodetection of the toxin. The best results were obtained by promoting the isolation of VHHs with the slowest koff (off-rate selection). Among these, the biotinylated nanobody A2.3 performed in ELISA with excellent recovery and high sensitivity, IC50 = 0.28 μg/L, with a limit of detection that is well below the most rigorous guidelines for the toxin. While it may be case-specific, these results highlight the importance of exploring different panning strategies to optimize the selection of antihapten nanobodies.

Creator

Pírez Schirmer, Macarena
Badagian, Natalia
Rossotti, Martín
Leizagoyen, Carmen
González Sapienza, Gualberto.

Source

Analytical Chemistry  v. 89, no. 12, 2017. -- p. 6800-6806

Publisher

ACS

Date

2017

Rights

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Format

PDF

Language

Inglès

Type

Artículo

Identifier

DOI: 10.1021/acs.analchem.7b01221

Document Item Type Metadata

Original Format

PDF
Date Added
March 16, 2018
Collection
Bibliografía Nacional Química
Item Type
Document
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Citation
Pírez Schirmer, Macarena et al., “Comparison of three anti-hapten VHH selection strategies for the development of highly sensitive immunoassays for microcystins,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed November 17, 2025, https://riquim.fq.edu.uy/items/show/4888.