AF394, AF395, AF397, AK142, AK652, AN193 and AV441 antibodies label the GFP protein by western blot


  • Cyril Guilhen UNIGE
  • Mathieu Vigneau
  • Bethania Tamrat
  • Emma Siebenmann
  • Tasnim Khadam-Al-Jame
  • Hugo Gillet
  • Eva Garrido
  • Hania Farhat
  • Jade Berlincourt
  • Luca Baltazar
  • Tess Arbez
  • Benjamin Adomako
  • Maxime Zholdokov
  • Marc Bobillier
  • Vincent Mendes Ferreira
  • Anja Maag
  • Maria Lung
  • Patricia Lopez
  • Julien Schär
  • Yekaterina Prutyanova
  • Marin Ollagnon
  • Garance Michel
  • Alexis Calomeni
  • Agnès Bury
  • Diana Boeva
  • Stéphane Durual



The recombinant antibodies AF394, AF395, AF397, AK142, AK652, AN193 and AV441 detect the GFP protein by western blot.


The green fluorescent protein (GFP) (Uniprot P42212) is a large (~235 aa) protein tag, widely used as a fluorescent reporter to detect and visualize GFP-fused proteins (Tsien, 1998). Here, we described the ability of 7 recombinant antibodies to detect the GFP protein by western blot. Three other tested antibodies (AF396, AN712 and AR464) did not.

Materials & Methods

Antibodies: ABCD_AF394, ABCD_AF395, ABCD_AF396, ABCD_AF397, ABCD_AK142, ABCD_AK652, ABCD_AN193, ABCD_AN712, ABCD_AR464 and ABCD_AV441 antibodies (ABCD nomenclature, were produced by the Geneva Antibody Facility ( as mini-antibodies with the antigen-binding portion fused to a rabbit IgG Fc. The synthesized scFv sequences (GeneArt, Invitrogen) correspond to the sequences of the variable regions joined by a peptide linker (GGGGS)3 (see Table 1 for clone names and references). HEK293 suspension cells (growing in FreeStyle™ 293 Expression Medium, Gibco 12338) were transiently transfected with the vector coding for the scFv-Fc of each antibody. Supernatants (see Table 1 for individual yields) were collected after 4 days.

ABCD Clone Reference Yield ( mg /L)
AF394 GBP1 Kirchhofer et al.,2010 120
A F395 GBP4 Kirchhofer et al.,2010 80
A F396 VHH Rothbauer et al.,2006 100
A F397 LaG-28 Fridy et al., 2014 140
AK142 cAbGFP4 Saerens et al., 2008 <5
AK652 GBP2 Pellis et al., 2012 120
AN193 3G86.32 Brauchle et al., 2014 60
AN712 3C3/64 Cosson, personal communication 100
AR464 B9 Fang et al., 2020 120
AV441 N86/20 Andrews et al., 2019 20
Table 1. Clone number, reference and production yields for the antibodies used in this study.

Antigen: Klebsiella pneumoniaebacteria transformed with a GFP-encoding plasmid were used to detect the GFP protein. Non-transformed bacteria (WT) were used as a negative control.

Protocol: 5 μL of overnight cultured Klebsiella pneumoniae bacteria (WT or transformed with the GFP-encoding plasmid) were pelleted, lysed in 20 μL of sample buffer (20.6% (w/v) sucrose, 100 mM Tris pH 6.8, 10 mM EDTA, 0.1% (w/v) bromophenol blue, 4% (w/v) SDS) and boiled at 95°C for 5 minutes. Each sample was migrated (200 V, 30 min) in a 4-20% acrylamide gel (SurePAGE Bis-Tris, Genscript M00655), and transferred to a nitrocellulose membrane using a dry transfer system for 10 min (iBlot gel transfer device, Invitrogen IB1001EU). The membranes were blocked overnight in PBS containing 0.1% (v/v) Tween20 and 7% (w/v) milk and washed three times for 5 min in PBS + 0.1% (v/v) Tween20. The membranes were then incubated with the recombinant antibodies (5 mg/L in PBS-Tween-milk) for 30 min at room temperature and washed three times for 5 min. The membranes were then incubated for 30 min with horseradish peroxidase-coupled goat anti-rabbit IgG (Sigma-Aldrich A8275, dilution 1:3000 in PBS-Tween-milk) and washed 5 times for 5 min in PBS-Tween. The signal was revealed by enhanced chemiluminescence (ECL) (Millipore) using a PXi-4 gel imaging system (Syngene).


Antibodies AF394, AF395, AF397, AK142, AK652, AN193 and AV441 recognized the GFP protein expressed in Klebsiellapneumoniae bacteria by western blot (Fig. 1). One band was observed at approximatively 35 kDa, which is slightly higher than the expected theoretical size (27 kDa). This may be due to post-translational modifications, such as glycosylation, which also occur in bacteria (Nothaft and Szymanski, 2010). No signal was detected in WT bacteria (Fig. 1). In these experimental conditions, a very weak signal was obtained with the antibody AR464, and no signal was detected with antibodies AF396 and AN712. Data obtained with AF394, AF395 and AF396 are consistent with previously published data (Lamrabet, 2019).

Figure 1. Specific binding of AF394, AF395, AF397, AK142, AK652, AN193 and AV441 antibodies to the GFP protein in Klebsiella pneumonia harboring a GFP-encoding plasmid (GFP). No band was observed in non-transformed (WT) bacteria. A very weak signal was obtained with the antibody AR464, and no signal was obtained with AF396 and AN712.

Conflict of interest

The authors declare no conflict of interest.


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How to Cite

Guilhen C, Vigneau M, Tamrat B, Siebenmann E, Khadam-Al-Jame T, Gillet H, Garrido E, Farhat H, Berlincourt J, Baltazar L, Arbez T, Adomako B, Zholdokov M, Bobillier M, Mendes Ferreira V, Maag A, Lung M, Lopez P, Schär J, Prutyanova Y, Ollagnon M, Michel G, Calomeni A, Bury A, Boeva D, Durual S. AF394, AF395, AF397, AK142, AK652, AN193 and AV441 antibodies label the GFP protein by western blot. Antib. Rep. [Internet]. 2022 Feb. 24 [cited 2024 Jul. 14];5(1):e677. Available from:

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