Describe a yeast two-hybrid assay for interaction between two known proteins.

Name: Problem 26, Chapter 5: Molecular Biology
Uploaded: 2026-02-12T22:41:52-08:00
Duration: 2 min 15 s
Channel: James Kiss
Description: Describe a yeast two-hybrid assay for interaction between two known proteins.

step 1 We split a transcription activator into two pieces. Only if bait meets prey do we reassemble a w

Describe a yeast two-hybrid assay for interaction between...

Key Concepts

Yeast Two-Hybrid Assay

The yeast two-hybrid assay is a molecular biology technique used to detect protein-protein interactions within a living yeast cell. This system exploits the modular nature of eukaryotic transcription factors, which have separable DNA-binding and activation domains. When these domains are brought together by interacting proteins, transcription of a reporter gene is activated, providing a measurable signal that indicates interaction.

Protein-Protein Interaction

Protein-protein interactions are fundamental to many biological processes and are often investigated using assays like the yeast two-hybrid. Interactions are critical to cell signaling, regulation, and structural organization. By studying these interactions, researchers can gain insights into protein function and the biological pathways in which they operate.

Fusion Protein Constructs

Fusion protein constructs are central to the yeast two-hybrid system. In this approach, one protein is genetically fused to a DNA-binding domain (often referred to as the 'bait') while the other protein is fused to a transcriptional activation domain (referred to as the 'prey'). If the proteins interact, the two domains are brought into close proximity, enabling the activation of a downstream reporter gene.

Transcription Factor Reconstitution

Transcription factor reconstitution is the principle underlying the yeast two-hybrid system. The separate domains of a transcription factor, when brought together by a protein-protein interaction, reassemble into a functional unit. This reconstitution leads to the transcription of reporter genes, providing a readout for the interaction between the proteins.

Reporter Gene Activation

Reporter gene activation is the measurable outcome in a yeast two-hybrid assay. When the bait and prey proteins interact, the reassembled transcription factor binds to specific promoter regions and activates the expression of reporter genes. These genes, which often confer a selectable phenotype or produce a detectable signal such as color or luminescence, allow researchers to identify positive interactions.

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