S. cerevisiae VN-fusion Library Individual Strains (Glycerol type)

Yeast genome-wide protein-protein interaction libraries

The S. cerevisiae VENUS-fusion Library consists of strains expressing two fragments (VN or VC) of the VENUS fluorescent protein attached to the C-terminus of each protein. The interaction of two proteins can be easily and quickly analyzed for all yeast proteins, and the interaction between proteins expressed in a natural state can be analyzed using its own promoter in the cell.

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Features and Benefits

  • Analysis of protein interactions and intracellular localization in live cells

  • Simple observation possible only with a fluorescence microscope

  • Easy to study the function and interaction of unknown new proteins

  • Proteinylation analysis possible (ubiquitination, sumoylation, neddylation, etc.)


S. cerevisiae VENUS-fusion library was developed at Seoul National University (VN-fusion Library: Genome Res. 2013. 23:736-746 & VC-fusion Library: Genome Res. 2019. 29:135-145). Bioneer owns their exclusive business license. The VENUS-fusion library consists of S. cerevisiae strains expressing an ORF containing each fragment of VENUS (VN & VC) at the C-terminus. The VN/VC fusion protein was inserted into the yeast chromosome via homologous recombination and expressed using its own promoter. The VN library consists of 5,809 strains and the VC library consists of 5552 strains, covering more than 90% of the S. cerevisiae proteome. .


Bimolecular Fluorescence Complementation (BiFC) Assay

In the bimolecular fluorescence complementation technique (BiFC), a fluorescent protein (VENUS) is divided into N-terminal (VN) and C-terminal (VC) fragments and then attached to each of the two proteins to be interacted with and expressed. After that, when two proteins are far apart, they do not fluoresce, but when the two fragments of VENUS protein are close enough to form an intact flourescence protein complex, which emits fluorescence. The fluorescence signal is measured directly under the fluorescent microscope, making it easy to use when studying protein interactions


Application 1. Analysis of protein and protein interactions and localization in cells


Figure 1. Confirmation of binding of two proteins (Sis1 & Ssa1) known to form homodimers  with VN/VC-fusion library

The binding of Sis1 (Type II HSP40 co-chaperone) and Ssa1 (HSP70 protein) in the nucleus and cytoplasm was confirmed by VENUS-complex fluorescence.

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