The future of
single-domain antibodies

Intrabody Enrichment by Yeast Two-Hybrid

Intrabody enrichment by Y2H is an antibody selection method biased towards the selection of antibodies working inside living cells - so-called intrabodies. It is proposed by Hybrigenics after one or several rounds of phage display antibody selection from the hs2dAb library. The antibodies obtained from the first rounds can be screened to saturation, inside yeast cells, using Hybrigenics' optimized Yeast Two-Hybrid (Y2H) technique.

The main benefit of the combined screening by Phage Display and Yeast Two-Hybrid is thus to enrich the selected antibodies in intrabodies, as the Y2H occurs inside an eukaryotic cell.


Intrabodies are fantastic tools for live cell imaging like video-microscopy and single molecule localization, and for in vivo applications. Learn more about Hybrigenics' Intrabody selection service.


Intrabody Enrichment by Yeast Two-Hybrid: how does it work?

Pre-selected hs2dAb are transferred from phages to a Y2H prey vector by gap repair. This vector allows the fusion of the Activation Domain (AD) of a transcription factor to the single-domain antibody sequence. This Y2H Antibody library (made of VHH nanobodies) is then transformed into a genetically modified yeast strain lacking the HIS3 gene necessary for the synthesis of histidine. The antigen of interest is fused to the DNA Binding Domain (DBD) of a transcription factor in a Y2H bait vector and then transformed into a second yeast strain of opposite sexual type compared to the prey yeast strain.

Put together, the two yeast strains mate and form diploids expressing both the antigen and a VHH nanobody from the library. If the antibody recognizes the antigen, it allows for the reconstitution of the functional transcription factor. It activates the transcription of the HIS3 reporter gene and allows yeast cells to grow on a selective medium lacking histidine. The DNA of the positive clones is then sequenced and analyzed to identify the selected intrabodies.

Intrabody Enrichment by Yeast two-Hybrid diagram


Benefit from our Y2H expertise for your intrabody selection

Hybrigenics has an unparalleled experience of more than 9,000 Y2H screens and has improved this technology to its highest level. Optimizations include technical improvements like yeast strains engineering and a patented mating protocol. Our state-of-the-art Y2H (Yeast Two-Hybrid) technology allows for the selection of the functional intrabody you need for in-cell applications.

In addition to the screening of the hs2dAb library for intrabody selection, Hybrigenics constructs its own cDNA libraries and offers to screen them to identify the binding partners of your favorite protein, DNA, RNA or Small Molecule. We have over 130 libraries from 35 different species and will construct dedicated libraries for your project upon request. They are the most complex and diverse Y2H libraries available on the market.

Learn more about ULTImate Y2H , ULTImate Libraries and our other screening services.

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