Two-hybrid Screen
Two-hybrid Screen - Related Videos
11:30
Unravelling the Function of a Bacterial Effector from a Non-cultivable Plant Pathogen Using a Yeast Two-hybrid Screen
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Cited by 8 •
2017
Bacterial effector proteins are important for establishing successful infections. This protocol describes the experimental identification of proteinaceous binding partners of a bacterial effector protein in its natural plant host. Identifying these effector interactions via yeast two-hybrid screens has become an important tool in unravelling molecular pathogenicity strategies.
14:23
A Yeast 2-Hybrid Screen in Batch to Compare Protein Interactions
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Cited by 6 •
2018
Batch processing of yeast 2-hybrid screens allows for direct comparison of the interaction profiles of multiple bait proteins with a highly complex set of prey fusion proteins. Here, we describe refined methods, new reagents, and how to implement their use for such screens.
03:24
Hybridization of Atomic Orbitals I
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2020
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
08:00
Whole-Mount In Situ Hybridization
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2023
Whole-mount in situ hybridization (WMISH) is a common technique used for visualizing the location of expressed RNAs in embryos. In this process, synthetically produced RNA probes are first complementarily bound, or "hybridized," to the transcripts of target genes. Immunohistochemistry or fluorescence is then used to detect these RNA hybrids, revealing spatial and temporal patterns of gene expression. Unlike traditional in situ hybridization techniques, which require thin tissue sections whose...
03:35
Hybridization of Atomic Orbitals II
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2020
sp3d and sp3d 2 Hybridization To describe the five bonding orbitals in a trigonal bipyramidal arrangement, we must use five of the valence shell atomic orbitals (the s orbital, the three p orbitals, and one of the d orbitals), which gives five sp3d hybrid orbitals. With an octahedral arrangement of six hybrid orbitals, we must use six valence shell atomic orbitals (the s orbital, the three p orbitals, and two of the d orbitals in its valence shell), which gives six sp3d 2 hybrid orbitals.
FAQs
The key event is functional reconstitution of a transcriptional regulator. When the bait and prey fusion proteins interact, the DNA-binding and activation domains are brought into proximity, allowing reporter-gene expression. This converts a physical protein association into a genetic signal, enabling interactions to be detected through reporter activity rather than direct biochemical observation.
Bait choice determines which protein anchors the screen, whereas the prey collection supplies candidate partners. Fusing each protein to the appropriate transcriptional domain makes the system suitable for testing many possible pairings. A protein of interest can therefore be examined against a library, helping identify binding partners that may participate in the same cellular interaction network.
Two-hybrid screening can do more than nominate partners: it can help investigate which portions of proteins support an interaction. Researchers can use the detected association to guide interaction-domain mapping, then compare those findings with biochemical or cellular assays. This distinction matters because a screen generates interaction evidence and functional hypotheses, rather than independently establishing every biological consequence.
A typical workflow begins by selecting a protein of interest as bait, fusing it to a DNA-binding domain, and preparing candidate prey proteins fused to an activation domain. The bait and prey constructs are then assessed in the yeast two-hybrid system, where reporter activation indicates an interaction. Candidate pairs can subsequently be examined in follow-up assays.
Library screening is useful when researchers want to discover partners without testing every candidate individually. By surveying many prey proteins against one bait, the method can reveal connections that expand a protein interaction network. These results may suggest previously unrecognized relationships and provide starting points for studying signaling or regulatory pathways in biology.
The principal outcome is a set of candidate protein associations linked to reporter activation. Those associations can help characterize cellular interaction networks and generate hypotheses about protein function, but the workflow is strongest when paired with biochemical or cellular validation. Follow-up experiments can validate the interaction, refine its interpretation, and connect a molecular association with a broader cellular pathway.