Fluorescence anisotropy measurements of WT Dmp53 and its mutants. DNA binding to 5-fluorescein-labeled double-stranded 30-mers containing either the recognition element from the gadd45 promoter (RE, closed circles) or a randomly generated sequence of 30 bases (RAN, open circles) was measured. A, p53 variants that bind the RE with high affinity. Green, QMHp53; blue, WT Dmp53; red, Dmp53 R235S mutant. B, p53 variants that abrogated the affinity to the RE. Blue, Dmp53 R155H; green, G233S; red, K259H; black, R268W.