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To bridge biological and biochemical disciplines, the relationship between in vitro protein biochemical function and in vivo activity must be established. Such studies can (a) help determine whether properties measured in simple, dilute solutions extrapolate to the complex in vivo conditions and (b) illuminate cryptic biological factors that are new avenues for study. We have explored the in vivo–in...
The short 8–10 amino acid “hinge” sequence in lactose repressor (LacI), present in other LacI/GalR family members, links DNA and inducer‐binding domains. Structural studies of full‐length or truncated LacI‐operator DNA complexes demonstrate insertion of the dimeric helical “hinge” structure at the center of the operator sequence. This association bends the DNA ∼40° and aligns flanking semi‐symmetric...
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