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PlzA is a c‐di‐GMP‐binding protein crucial for adaptation of the Lyme disease spirochete Borrelia (Borreliella) burgdorferi during its enzootic life cycle. Unliganded apo‐PlzA is important for vertebrate infection, while liganded holo‐PlzA is important for survival in the tick; however, the biological function of PlzA has remained enigmatic. Here, we report that PlzA has RNA chaperone activity that...
Intermolecular electron transfer (ET) between hexaamineruthenium(II), a6Ru2+, and a K73H/K79A variant of iso‐1‐cytochrome c, iso‐1‐Cytc, is used to study conformational ET switches mediated by His73‐heme ligation and cis to trans isomerization of the Ile75‐Pro76 peptidyl‐prolyl bond of iso‐1‐Cytc. The biomolecular rate constant for ET to the native state of K73H/K79A iso‐1‐Cytc is ∼270 mM−1 s−1 near...
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