Affiliation:
1. Texas A&M University, College Station, TX, USA
Abstract
The yeast two-hybrid system has been used to characterize many protein-protein interactions. A two-hybrid system for E. coli was constructed in which one hybrid protein bound to a specific DNA site recruits another to an adjacent DNA binding site. The first hybrid comprises a test protein, the bait, fused to a chimeric protein containing the 434 repressor DNA binding domain. In the second hybrid, a second test protein, the prey, is fused downstream of a chimeric protein with the DNA binding specificity of the λ repressor. Reporters were designed to express cat and lacZ under the control of a low-affinity λ operator. At low expression levels, λ repressor hybrids weakly repress the reporter genes. A high-affinity operator recognized by 434 repressor was placed nearby, in a position that does not yield repression by 434 repressor alone. If the test proteins interact, the 434 hybrid bound to the 434 operator stabilizes the binding of the λ repressor hybrid to the λ operator, causing increased repression of the reporter genes. Reconstruction experiments with the fos and jun leucine zippers detected proteinprotein interactions between either homodimeric or heterodimeric leucine zippers.
Subject
General Biochemistry, Genetics and Molecular Biology,Biotechnology
Cited by
17 articles.
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