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The new C terminus of LexA1–84 directs its degradation. (A) A time course of ClpXP degradation of LexA1–84, LexA1–87, and LexA1–84DD was quantified after SDS-PAGE. (B) ClpXP degradation of GFP-ssrA was measured by loss of fluorescence at 511 nm in the presence of various forms of LexA at 20 μM. An effective inhibitor of GFP-ssrA degradation, the ssrA peptide (20 μM), is included for comparison.
