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Mol. Cell. Biol., Oct 1995, 5820-5829, Vol 15, No. 10
J Estojak, R Brent and EA Golemis
Since their introduction, the interaction trap and other two-hybrid systems
have been used to study protein-protein interactions. Despite their general
use, little is known about the extent to which the degree of protein
interaction determined by two-hybrid approaches parallels the degree of
interaction determined by biochemical techniques. In this study, we used a
set of lexAop-LEU2 and lexAop-lacZ reporters to calibrate the interaction
trap. For the calibration, we used two sets of proteins, the Myc-Max-Mxi1
helix-loop-helix proteins, and wild-type and dimerization-defective
versions of the lambda cI repressor. Our results indicate that the strength
of interaction as predicted by the two-hybrid approach generally correlates
with that determined in vitro, permitting discrimination of high-,
intermediate-, and low-affinity interactions, but there was no single
reporter for which the amount of gene expression linearly reflected
affinity measured in vitro. However, some reporters showed thresholds and
only responded to stronger interactions. Finally, some interactions were
subject to directionality, and their apparent strength depended on the
reporter used. Taken together, our results provide a cautionary framework
for interpreting affinities from two-hybrid experiments.
Copyright © 1995, American Society for Microbiology
Correlation of two-hybrid affinity data with in vitro measurements
Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111, USA.
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