Related Experiment Video
Updated: Jul 5, 2026
07:25
In Vitro Methods for Comparing Target Binding and CDC Induction Between Therapeutic Antibodies: Applications in Biosimilarity Analysis
Published on: May 4, 2017
Correlation of two-hybrid affinity data with in vitro measurements
J Estojak1, R Brent, E A Golemis
1Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111, USA.
Molecular and Cellular Biology
|October 1, 1995
Summary
This study calibrated the interaction trap, a method for studying protein-protein interactions. Results show two-hybrid systems generally correlate with biochemical methods but caution is advised when interpreting interaction strengths.
Area of Science:
- Molecular Biology
- Biochemistry
Background:
- Two-hybrid systems are widely used to study protein-protein interactions.
- The quantitative accuracy of two-hybrid methods compared to biochemical assays is not well understood.
Purpose of the Study:
- To calibrate the interaction trap using specific reporter systems.
- To assess the correlation between interaction strength measured by two-hybrid assays and in vitro biochemical methods.
Main Methods:
- Utilized lexAop-LEU2 and lexAop-lacZ reporter systems.
- Employed Myc-Max-Mxi1 helix-loop-helix proteins and lambda cI repressor variants for calibration.
Main Results:
- Two-hybrid interaction strength generally correlated with in vitro measurements, distinguishing high, intermediate, and low affinities.
- No single reporter linearly reflected in vitro affinity; some showed thresholds for strong interactions.
- Observed directionality effects, where apparent interaction strength varied with the reporter used.
Conclusions:
- Two-hybrid systems provide a generally reliable, albeit not perfectly linear, measure of protein interaction affinity.
- Caution is recommended when interpreting quantitative interaction affinities from two-hybrid experiments due to reporter variability and potential directionality.
More Related Videos
Related Concept Videos
02:31In-situ Hybridization
In situ hybridization (ISH) is a technique used to detect and localize specific DNA or RNA molecules in cells, tissue, or tissue sections using a labeled probe. The technique was first used in 1969 for the investigation of nucleic acids. It is currently an essential tool in scientific research and clinical settings, especially for diagnostic purposes.
Types of probes and labels
A probe is a complementary strand of DNA or RNA that binds to corresponding nucleotide sequences in a cell. Many...
Types of probes and labels
A probe is a complementary strand of DNA or RNA that binds to corresponding nucleotide sequences in a cell. Many...
01:20Drug Product Performance: In Vitro–In Vivo Correlation
In pharmaceutical development, it's crucial to establish a predictive in vitro–in vivo correlation (IVIVC) for two or more formulations to gain a comprehensive understanding of release properties. IVIVC reduces the need for costly in vivo studies and facilitates the establishment of meaningful dissolution specifications with significant cost savings and decreased regulatory burden. Furthermore, a meaningful IVIVC should predict Cmax and AUC within 20%, aligning with FDA guidance while adhering...