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- W2013286224 abstract "Two-component regulatory systems require highly specific interactions between histidine kinase (transmitter) and response regulator (receiver) proteins. We have developed a novel genetic strategy that is based on tightly regulated synthesis of a given protein to identify domains and residues of an interacting protein that are critical for interactions between them. Using a reporter strain synthesizing the nonpartner kinase VanS under tight arabinose control and carrying a promoter- lacZ fusion activated by phospho-PhoB, we isolated altered recognition (AR) mutants of PhoB showing enhanced activation (phosphorylation) by VanS as arabinose-dependent Lac + mutants. Changes in the PhoB AR mutants cluster in a “patch” near the proposed helix 4 of PhoB based on the CheY crystal structure (a homolog of the PhoB receiver domain) providing further evidence that helix 4 lies in the kinase-regulator interface. Based on the CheY structure, one mutant has an additional change in a region that may propagate a conformational change to helix 4. The overall genetic strategy described here may also be useful for studying interactions of other components of the vancomycin resistance and P i signal transduction pathways, other two-component regulatory systems, and other interacting proteins. Conditionally replicative oriR R6Kγ attP “genome targeting” suicide plasmids carrying mutagenized phoB coding regions were integrated into the chromosome of a reporter strain to create mutant libraries; plasmids encoding mutant PhoB proteins were subsequently retrieved by P1-Int-Xis cloning. Finally, the use of similar genome targeting plasmids and P1-Int-Xis cloning should be generally useful for constructing genomic libraries from a wide array of organisms." @default.
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- W2013286224 date "1996-12-10" @default.
- W2013286224 modified "2023-09-29" @default.
- W2013286224 title "Altered recognition mutants of the response regulator PhoB: A new genetic strategy for studying protein–protein interactions" @default.
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- W2013286224 doi "https://doi.org/10.1073/pnas.93.25.14361" @default.
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