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Phosphorimages of gel mobility shift assays illustrating that the DBD of CbbR interacts with RegA. (A) CbbR-DBD-plus-linker helix truncation mutant protein bound to 32P-labeled probe-0 in the presence of RegA. (B) CbbR-DBD-plus-linker helix truncation mutant protein bound to 32P-labeled probe-1234 in the absence or presence of RegA; CbbR-linker-plus-RDI/RDII truncation mutant protein did not bind to probe-1234 or RegA.
