Advantages and Limitations of Yeast Two-Hybrid Screening
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Questions and Answers

Protein-protein interactions can be classified based on ______

composition

______ proteins carry out their functions as homo-oligomers

Several enzymes, carrier proteins, scaffolding proteins, and transcriptional regulatory factors

Targeted modulation of PPIs with small molecules is a promising approach in ______ development

drug

The yeast 2-hybrid assay is a technique used to detect ______ interactions

<p>protein-protein</p> Signup and view all the answers

Yeast two-hybrid experiment detects the physical interactions of proteins through the activation of a ______ gene

<p>reporter</p> Signup and view all the answers

Most commonly, transcription in a yeast two-hybrid experiment is measured by ______ selection

<p>auxotrophic</p> Signup and view all the answers

The Y2H assay relies on the expression of a reporter gene (such as lacZ or GFP), which is activated by the binding of a particular ______ factor.

<p>transcription</p> Signup and view all the answers

The query protein of interest fused with the BD is known as the ______, and the protein library fused with the AD is referred to as the Prey.

<p>Bait</p> Signup and view all the answers

In order to activate the reporter gene expression, a ______ unit must be present at the gene locus.

<p>transcriptional</p> Signup and view all the answers

Expression of a reporter gene requires the binding of a transcription factor, which normally consists of two functionally and structurally independent domains: DNA-binding (DB) and ______ domains.

<p>activation</p> Signup and view all the answers

In the absence of Bait-Prey interaction, the AD domain is unable to localize to the reporter gene to drive gene ______.

<p>expression</p> Signup and view all the answers

However, when Bait and Prey interact, the DB domain binds to the DNA localizing the AD domain upstream of the reporter gene, leading to the expression of reporter ______.

<p>gene</p> Signup and view all the answers

Advantages of Y2H: Y2H is a relatively fast and easy way to screen for ______ interactions

<p>protein-protein</p> Signup and view all the answers

Y2H requires little hands-on time and technical skill, making it ______ to use

<p>easy</p> Signup and view all the answers

Y2H can be scaled up by screening yeast libraries of tagged “prey” proteins against a single “bait”, allowing thousands of potential interactions to be screened ______

<p>rapidly</p> Signup and view all the answers

Limitations of Yeast Two-Hybrids: There are high rates of false positives and false negatives in Y2H ______

<p>screens</p> Signup and view all the answers

Protein folding, expression, and post-translational modifications may not be the same in yeast as they are in humans, affecting their physical ______

<p>interactions</p> Signup and view all the answers

Fluorescence resonance energy transfer (FRET) is distance sensitive - if the distance is less than 10 nanometers, ______ happens

<p>FRET</p> Signup and view all the answers

Co-immunoprecipitation is an extension of IP that is based on the potential of IP reactions to capture and purify the primary target, the ______

<p>antigen</p> Signup and view all the answers

In Co-IP, complexes of two (or more) proteins are isolated using a procedure similar to the IP ______

<p>procedure</p> Signup and view all the answers

Co-IP is often used for the analysis of interactions of multiple proteins and their ______

<p>functions</p> Signup and view all the answers

The principle of Co-IP is the same as IP, except that the proteins associated with the antigen are also ______

<p>precipitated</p> Signup and view all the answers

A protein complex is isolated by Co-IP using an antibody for one of the components in the ______

<p>complex</p> Signup and view all the answers

The choice of antibody is critical for successful Co-IP. The antibody must bind to the surface of the ______

<p>complex</p> Signup and view all the answers

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