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Sex-reversal mutations in human SRY cluster within its high-mobility group box, a conserved motif of DNA bending. A classical substitution at the crux of this angular domain (M64I) has been reported to impair DNA bending but not DNA binding, implying that sharp bending is required for transcriptional activation and testis determination. Surprisingly, we report that this defect was an inadvertent consequence...
Human testis-determining factor SRY contains a high-mobility-group (HMG) box, an α-helical DNA-binding domain that binds within an expanded minor groove to induce DNA bending. This motif is flanked on the C-terminal end by a basic tail, which functions both as a nuclear localization signal and accessory DNA-binding element. Whereas the HMG box is broadly conserved among otherwise unrelated transcription...
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