Plant Yeast One-Hybrid Library Construction and Screening Service
Plant Protein-DNA Interaction Screening
CD BioSciences provides Plant Yeast One-Hybrid (Y1H) library construction and screening services for identifying plant proteins that bind to a defined DNA sequence, promoter fragment, enhancer element, or cis-regulatory motif.
Y1H screening is useful when a researcher has a candidate DNA bait and needs to discover potential transcription factors or other DNA-binding proteins. The service can include bait design, bait strain construction, auto-activation testing, selection stringency optimization, cDNA library screening, positive clone confirmation, sequencing, and hit analysis.
Principle of Y1H
In a Y1H assay, the DNA bait sequence is placed upstream of a reporter system in yeast. A prey library expresses candidate proteins fused to a transcriptional activation domain. If a prey protein binds to the DNA bait, the activation domain can drive reporter gene expression, allowing positive yeast colonies to grow under selective conditions.
The assay identifies candidate DNA-binding proteins under yeast assay conditions. Positive hits should be interpreted together with bait background controls, selection stringency, sequencing results, and follow-up validation experiments.
Figure 1. Y1H principle using a DNA bait and reporter activation system in yeast.
Service Scope
Promoter fragments, cis-elements, enhancers, or motif-containing sequences can be evaluated for Y1H bait construction.
The DNA bait can be integrated or introduced into a suitable yeast reporter system according to project design.
Bait background activity is assessed before library screening, with inhibitor or stringency optimization when required.
Positive colonies are picked, confirmed, sequenced, and analyzed to identify candidate DNA-binding proteins.
Bait Design and Stringency
Y1H bait design has a direct effect on screening specificity and false-negative risk. Full promoter regions may preserve more native regulatory context, but long or repetitive fragments may be harder to construct and may increase background. Short motifs or core elements can be easier to test and mutate, but may miss cooperative or context-dependent binding.
Figure 2. Bait auto-activation testing and selection stringency optimization before Y1H library screening.
If strong auto-activation is observed, the bait may require inhibitor optimization, truncation, alternative bait design, or a different validation strategy. These decisions should be made before large-scale screening.
Workflow
Figure 3. General workflow for plant Y1H library construction and screening.
- Review of DNA bait sequence and research objective
- Bait vector and bait strain construction
- Auto-activation and toxicity assessment
- cDNA library preparation or library selection
- Library transformation and selective screening
- Positive colony confirmation by PCR and sequencing
- Hit annotation, redundancy removal, and result reporting
Controls and Interpretation
| Control or Check | Purpose |
|---|---|
| Bait-only background test | Evaluates whether the DNA bait activates the reporter without prey protein. |
| Selection stringency test | Determines inhibitor concentration or selection conditions suitable for screening. |
| Positive and negative controls | Confirm that the yeast system and reporter selection behave as expected. |
| Point-to-point validation | Re-tests selected bait-prey interactions after library screening. |
Sample and Information Requirements
- Plant species and tissue or cell source
- DNA bait sequence, promoter region, or motif information
- Expected screening library or sample source
- Relevant references or motif prediction data
- Existing bait plasmid or sequence file, if available
- Number of baits and required follow-up validation groups
Deliverables
- Bait design and construction information
- Auto-activation and selection stringency records
- Library screening images and experimental records
- Positive clone PCR and sequencing results
- Hit list with sequence identity or annotation information
- Standard project report and original data files, where applicable
Related Services
Please contact us with your DNA bait sequence, plant species, sample source, and screening objective for project evaluation.
For research use only, not for clinical use.