Figure 7.

Comparison of operator DNA free and in complex with Δ19ω₂. (A) Minor (m) and major (M) groove widths along the central 11 bp of each operator, as measured by shortest P-P distances (less two phosphate group radii, 5.8 Å) indicated by horizontal dotted black lines for ideal B-DNA (24), 5.7 Å and 11.7 Å, respectively, Note minor groove narrowing in the ⁷AAAT¹⁰ tract of in Δ19ω₂-bound and free (→→) DNA and reduced narrowing in ⁷AAGT¹⁰ tract of (Δ19ω₂)₂-(→←). (B) Base pair buckle κ (°) and (C) inclination angles η (°) of each operator.